BBCET 141 Solved Guess Paper is a 45 page answer set covering twelve full length questions for IGNOU Nutritional Biochemistry, the fifth semester core course of the B.Sc. (Honours) Biochemistry programme. Every question in it was picked after checking which topics kept returning across six term end papers, and every answer was written from the IGNOU book itself rather than from general nutrition notes.
Five of those twelve questions are printed in full on this page. Read them, judge the depth for yourself, and if the standard suits you, the remaining seven answers come over WhatsApp.
BBCET 141 Key Facts at a Glance
- Course code: BBCET 141
- Course title: Nutritional Biochemistry
- Programme: B.Sc. (Honours) Biochemistry (BSCBCH)
- Course type: Core course, fifth semester, UGC CBCS scheme
- Theory credits: 4
- Linked practical: BBCEL 142, 2 credits, seven laboratory experiments
- Blocks: 4
- Units: 12
- Exam duration: 3 hours
- Maximum marks: 70
- Questions in this guess paper: 12
- Sample answers shown on this page: 5
- Answers sent after enquiry: 7
- Total pages of answers: 45
- Target session: December 2026 term end examination
What the BBCET 141 Solved Guess Paper Covers and Who Should Use It
The BBCET 141 guess paper is a twelve question answer set for IGNOU Nutritional Biochemistry, drawn from all four blocks and all twelve units of the official study material, and written for students sitting the December 2026 term end examination.
It is not a leaked paper and it is not sold as one. What it is: a shortlist of the questions that have refused to disappear from BBCET 141 papers, each answered to the depth an evaluator actually rewards. If you have three weeks left and the four blocks feel like four separate subjects, this narrows the field to something you can finish.
Two groups get the most out of it. First, working students who cannot read 12 units cover to cover and need a defensible shortlist. Second, repeaters who scored in the twenties and thirties last time, usually because their answers were correct but thin. If you are building a wider revision set across several courses, our IGNOU Solved Guess Paper collection covers other BSCBCH codes on the same pattern.
One honest limit. A guess paper is a probability tool, not a syllabus replacement. It works best sitting next to your IGNOU book, not instead of it. Students who treat it as the only thing they read tend to write good answers to two questions and blank answers to the rest.
BBCET 141 Sample Questions With Full Solutions
Five of the twelve BBCET 141 answers are reproduced below in full, covering all four blocks: energy expenditure, vitamins, lipids, cardiovascular disease and blood glucose regulation.
These are not trimmed extracts. They are the answers exactly as they appear in the PDF, so you can judge the writing standard before you enquire about the other seven.
Total Energy Expenditure and Factors Affecting Metabolic Rate
(a) Define Total Energy Expenditure and explain its three components in detail. (b) Discuss the factors affecting the metabolic rate of an individual.
(a) Total Energy Expenditure and its components
Dietary energy requirements of non growing individuals can be predicted by Total Energy Expenditure. The book divides TEE into three components: Basal Metabolic Rate or Resting Metabolic Rate, which typically accounts for 60 to 70 per cent of TEE; Thermic Effect of Feeding, also called Specific Dynamic Action, at 7 to 13 per cent of energy intake over the four hour period after a meal; and Physical Activity Energy Expenditure.
Component 1, Basal Metabolic Rate. Energy measured when a person is in the thermo neutral zone, fasting and resting, is known as Basal Metabolic Rate. The individual should be in a long post absorptive phase so there is no effect of SDA, in supine position, at mental rest, in a place of thermal comfort and not brightly lit. BMR should be measured in morning hours after an overnight sleep at the site of measurement.
At BMR, energy is required for membrane transport, protein synthesis and degradation, maintaining temperature, physical activity and growth. In a healthy person brain, liver and muscle use 20, 25 and 25 per cent of BMR respectively. Resting Metabolic Rate is a similar measurement with less rigid conditions: shorter fast, posture may differ, and thermo neutrality is not obligatory.
Schofield equations, derived from world literature on BMR, predict BMR with 7 to 10 per cent uncertainty. For an adult male aged 18 to 30 years, BMR in kcal per day equals 15.1 W plus 692.2, where W is body weight in kilograms. For Indian adults the FAO WHO UNU 2004 equations overestimate BMR by about 10 per cent in males and 9 per cent in females, so the value is multiplied by 0.90 under ICMR NIN, 2020. For a 60 kg adult male aged 20 years this gives 1438 kcal per day.
Component 2, Specific Dynamic Action. SDA, also called diet induced thermogenesis or thermic effect of food, is the rise in metabolic rate caused by consuming, digesting and assimilating food. Protein costs the most, at 20 to 30 per cent of the calories eaten. Carbohydrate costs 5 to 10 per cent and fat 0 to 3 per cent. So 100 calories of protein nets 70 to 80 calories, pure carbohydrate nets 90 to 95, and fat nets 97 to 100.
Component 3, Physical Activity Energy Expenditure. PAEE is the second largest component after BMR, the most variable, and the only one under voluntary control. In a sedentary individual it may account for 15 to 20 per cent of TEE; in highly active individuals, 50 to 60 per cent.
Spontaneous activity such as posture maintenance and fidgeting also contributes. Activities are expressed as multiples of BMR, the Physical Activity Ratio: sleeping 1.0, sitting quietly 1.2, standing 1.4 for men and 1.5 for women, walking slowly 2.8 and 3.0, walking uphill 7.1 and 5.4, cycling 5.6 and 3.6.
(b) Factors affecting metabolic rate
Table 2.5 of the book groups these into two categories. Factors exerting particularly large effects are physical activity level, where metabolic rate rises with activity, and environmental temperature. In homeotherms metabolic rate is lowest in the thermo neutral zone and rises both below it and above it. In poikilotherms such as fish, metabolic rate rises and falls directly with temperature.
Eight factors exert smaller effects on metabolic rate:
- Ingestion of a meal, particularly a protein rich one, which raises metabolic rate for several hours.
- Body size, where weight specific metabolic rate rises as body size falls.
- Age, which in humans rises up to puberty and then declines.
- Gender, with metabolic rate higher in males.
- Environmental oxygen level, which lowers metabolic rate below a threshold.
- Hormonal status, as with excess thyroid secretion in mammals.
- Time of day, with metabolic rate higher in daytime.
- Salinity of water, in osmoregulating aquatic animals.
The book separately notes that BMR varies with sex, age, fat free mass and fat mass, reproductive phase including menstrual, luteal and follicular phases, exercise, hypo or hyperthyroidism, catecholamine release, fever, stress, cold exposure and burns.
Conclusion. TEE is the sum of BMR at 60 to 70 per cent, SDA at 7 to 13 per cent of intake, and PAEE at 15 to 60 per cent depending on activity. Metabolic rate is driven mainly by physical activity level and environmental temperature, and to a smaller degree by meal ingestion, body size, age, gender, oxygen level, hormonal status, time of day and water salinity. Schofield and FAO equations predict BMR, with a 0.90 correction factor for Indians under ICMR NIN, 2020.
Biochemical Functions, RDA and Deficiency of Four Vitamins
Write the biochemical functions, RDA value and deficiency diseases of any four of the following vitamins: folic acid, niacin, vitamin K, vitamin D, vitamin C, vitamin A, vitamin B12.
Folic acid, vitamin B9
Folic acid is a haematopoietic vitamin, the name coming from the Latin folium meaning leaf, since green leafy vegetables are a rich source. Its structure has three groups: a pteridine ring system, para aminobenzoic acid and a glutamic acid residue. Mammals cannot synthesise it and must take it in the diet.
Tetrahydrofolate is the coenzyme form. It transfers one carbon units, which attach at N5, N10 or the bridging N5 N10 positions. Folate is required by rapidly dividing cells, especially in amino acid and nucleic acid metabolism. Key reactions include conversion of serine to glycine, synthesis of serine, degradation of glycine, conversion of homocysteine to methionine which also needs B12, synthesis of formylmethionyl tRNA, and synthesis of purine nucleotides.
Under ICMR NIN, 2020 the EAR is 250 micrograms per day for a 65 kg man and 180 for a 55 kg woman. RDA is 300 and 220 micrograms per day. TUL is 1000 micrograms per day for adults. About 50 per cent of folate in Indian diets is absorbed and roughly 32 per cent is lost in cooking.
Deficiency is common in India, from poor intake or defective absorption. Because folate drives purine synthesis, deficiency impairs DNA replication and cell division, and rapidly dividing cells become oversized. Macrocytic anaemia with megaloblastic bone marrow changes is the defining feature. Shortage at conception causes neural tube defects such as spina bifida. Combined folate and B12 deficiency raises blood homocysteine, a major risk factor for cardiovascular disease.
Niacin, vitamin B3
Niacin covers nicotinic acid and nicotinamide. It was found during studies of pellagra. It is not strictly a vitamin, since the body makes small amounts from tryptophan, at 1 mg of niacin from 60 mg of tryptophan.
Two coenzymes derive from nicotinamide: NAD plus and NADP plus. With their reduced forms NADH and NADPH they act as oxidising agents in many reactions. NAD plus works largely in catabolic redox reactions in the mitochondrial matrix.
NADPH matters for DNA repair and calcium ion mobilisation, with the pentose phosphate pathway as its major source. NAD dependent enzymes include glyceraldehyde 3 phosphate dehydrogenase, lactate dehydrogenase, the pyruvate dehydrogenase complex and glutamate dehydrogenase.
Niacin is found in unrefined grains, cereals, peanuts, legumes, liver and meat, with about 25 per cent lost in cooking. EAR is 5.6 mg NE per 1000 kcal, set at 12 and 9 mg per day for sedentary men and women. RDA is 14 and 11 mg per day. TUL is 35 mg per day. Deficiency causes pellagra, involving skin, gastrointestinal tract and central nervous system, with dermatitis on sun exposed areas, diarrhoea and dementia.
Vitamin K
The letter K comes from the German koagulation. It is a naphthoquinone derivative with a quinone ring and an isoprenoid side chain. Vitamin K1, phylloquinone, is made by plants with a 20 carbon side chain and was isolated in 1929 by Henrik Dam. Vitamin K2, menaquinone, is made by intestinal bacteria with a 30 carbon side chain and was discovered by Edward Doisy in 1939. Both shared the 1943 Nobel Prize in Physiology. Menadione is a synthetic analogue used clinically.
Vitamin K is essential to blood clotting. It drives post translational modification of glutamic acid residues to gamma carboxy glutamic acid residues, which chelate calcium. The dependent factors are Factor II prothrombin, Factor VII, Factor IX Christmas factor and Factor X Stuart Prower factor.
During carboxylation the hydroquinone form is oxidised to the epoxide by vitamin K epoxidase, reduced back to quinone by epoxide reductase, then reduced to hydroquinone by quinone reductase using NADPH. This is the vitamin K cycle. It also builds gamma carboxy glutamate residues in osteocalcin and bone matrix protein.
Green leafy vegetables are good sources; beans, peas and some spices carry moderate amounts. RDA is 55 micrograms per day for adults. Deficiency causes haemorrhagic disease of the newborn. Premature infants are at risk from absent hepatic stores, low breast milk levels and absent gut flora, so a prophylactic 1 mg menadione dose is common. In older children and adults, bruising tendency, ecchymotic patches, mucous membrane haemorrhage and prolonged prothrombin time are the markers.
Vitamin D, cholecalciferol
McCollum showed dietary rickets in rats in 1919. Angus and coworkers isolated the vitamin in 1931 and named it calciferol, later identified as D3. Otto Diels and Kurt Alder clarified the structure and took the 1950 Nobel Prize in Chemistry.
Vitamin D is a prohormone. Cholecalciferol forms in skin from 7 dehydrocholesterol under UV radiation, is hydroxylated in the liver to 25 hydroxy cholecalciferol, the major storage form, then hydroxylated in the kidney to 1,25 dihydroxy cholecalciferol or calcitriol, the active hormone.
Calcitriol binds the nuclear Vitamin D Receptor, and the complex binds Vitamin D Response Elements on DNA, regulating over 500 genes. It promotes calcium and phosphorus absorption by inducing calbindin, and participates in insulin secretion, thyroid hormone synthesis and immune modulation.
Twenty minutes of daily sun exposure at UV B wavelengths of 290 to 320 nm without sunscreen is recommended, with maximum synthesis between 11 AM and 3 PM. Dietary sources are fish liver oil, fish, liver and egg yolk.
EAR is 400 IU per day, RDA 600 IU per day for all ages except infants under one year at 400 IU, and TUL for adults is 4000 IU per day. Deficiency causes rickets in children, with bow legs, knock knee, rickety rosary, frontal bossing, pigeon chest and Harrison's sulcus, and osteomalacia in adults with raised bone alkaline phosphatase.
Conclusion. Each vitamin has a non overlapping role. Folic acid drives one carbon transfer for nucleotide synthesis, with megaloblastic anaemia and neural tube defects on deficiency. Niacin forms NAD and NADP for redox reactions, with pellagra on deficiency.
Vitamin K carboxylates glutamate residues in Factors II, VII, IX and X, with haemorrhagic disease of the newborn. Vitamin D, activated to calcitriol, promotes calcium absorption via calbindin, with rickets and osteomalacia. All RDA values are ICMR NIN, 2020.
Biological Functions of Lipids and the Essential Fatty Acids
(a) Describe the various biological functions and dietary sources of lipids. (b) Name two essential fatty acids and explain their biochemical functions.
(a) Functions of lipids
Energy storage and thermal insulation. About 95 per cent of stored body lipid is triacylglycerol, and lipid is the only form in which the body stores energy for long periods. Fat beats carbohydrate and protein on two counts: more than twice the energy for the same weight, and no bound water, since carbohydrates and proteins are hydrophilic.
When needed, lipase splits stored triacylglycerol into glycerol and free fatty acids for skeletal muscle, heart and kidney. Subcutaneous fat insulates, cushions and supports thermoregulation.
Absorption of fat soluble nutrients. Fat soluble vitamins and carotenoids are too hydrophobic for the intestinal environment. Micelles formed from dietary lipids, bile salts and lecithins trap them and carry them to absorption. After absorption they are packed into lipoproteins and carried through blood to target organs.
Plasma membrane component. Plasma membranes of most cells are 40 to 50 per cent lipid by weight, built as a double layered sheet of amphipathic phospholipids, glycolipids, cholesterol and proteins. Common membrane lipids are phosphatidylcholine, phosphatidylserine, phosphatidylinositol, phosphatidylethanolamine, sphingomyelin, cerebroside and gangliosides. The right ratio of saturated to unsaturated fatty acids keeps the membrane fluid, since unsaturated chains bend and prevent tight packing.
Precursors of hormones and local mediators. Steroid hormones come from cholesterol: androgens for male reproduction, oestrogens for female reproduction, aldosterone for salt balance and cortisol for glucose, amino acid and fat metabolism.
Eicosanoids, meaning prostaglandins, leukotrienes, thromboxanes and lipoxins, come from arachidonic acid and EPA released from membrane phospholipids, and act in inflammation, pain, coagulation and immunity. Lysophospholipids such as PAF regulate vascular and immune systems.
Other functions. Human blood groups are set by sugar residues of glycolipids on red cell membranes. Cholesterol is precursor to bile components, vitamin D and steroid hormones. Certain phospholipids act as lung surfactants.
| Food source | SFA % | MUFA % | PUFA % |
|---|---|---|---|
| Butter and ghee | 68 | 29 | 3 |
| Sunflower oil | 12 | 22 | 62 |
| Soybean | 14 | 24 | 60 |
| Flaxseeds | 10 | 21 | 69 |
| Mustard and rapeseed | 4 | 65 | 29 |
| Coconut | 92 | 6 | 2 |
| Olive oil | 16.6 | 65.3 | 11.8 |
| Palm oil | 45.2 | 41.6 | 8.3 |
(b) Essential fatty acids
Essential fatty acids are those the body cannot synthesise and must obtain from food. Humans lack the enzymes to add double bonds beyond the ninth carbon counted from the carboxylic end. The two are linoleic acid, 18:2 omega 6, and alpha linolenic acid, 18:3 omega 3. Plants synthesise them efficiently, so sunflower, soybean, flax seed and canola are good sources.
Both, being unsaturated, maintain plasma membrane fluidity when built into phospholipids. Their more important role is as precursors of eicosanoids. Dietary linoleic acid converts to arachidonic acid, a 20 carbon omega 6 fatty acid with four double bonds, which sits in membrane phospholipids and is cleaved by phospholipase into prostaglandins, leukotrienes and thromboxanes.
Alpha linolenic acid converts to 20 carbon EPA and 22 carbon DHA, and EPA derived mediators counter some inflammatory effects of the arachidonic acid derived ones.
Alpha linolenic acid helps prevent cardiovascular disease, arthritis, renal disease and conditions affecting mental function such as Alzheimer's disease. DHA matters for normal development of brain and retina, particularly in childhood, and for heart health. Since the body may not make enough EPA and DHA, they are called conditionally essential fatty acids under increased demand.
Deficiency of essential fatty acids gives scaly rashes, poor wound healing and hair loss. The book recommends an n-6 to n-3 ratio of 5 to 10 to 1. Long term low alpha linolenic acid intake can aggravate inflammatory disease such as arthritis. Under ICMR NIN, 2020, n-6 PUFA should give 4 to 10 per cent of energy and n-3 PUFA 0.5 to 1 per cent, with a minimum of 2.5 per cent energy from linoleic acid plus 0.5 per cent from alpha linolenic acid.
Conclusion. Lipids serve five roles: energy storage with thermal insulation, absorption and transport of fat soluble nutrients, plasma membrane structure, precursors of steroid hormones and eicosanoids, and functions such as blood group determination. Linoleic acid and alpha linolenic acid must come from diet because humans lack desaturases beyond carbon nine. They feed arachidonic acid and EPA or DHA respectively, the latter being critical for brain, retina and cardiovascular health.
Atherosclerosis and Risk Factors for Cardiovascular Disease
(a) What is atherosclerosis? Explain the formation of an atheromatous plaque. (b) Discuss the risk factors for cardiovascular diseases.
(a) Atherosclerosis and plaque formation
The book opens with the World Health Organization definition: cardiovascular diseases are disorders of the heart and blood vessels, including coronary heart disease, cerebrovascular disease and rheumatic heart disease, with four out of five CVD deaths caused by heart attacks and strokes.
Plaque is a fatty, waxy substance that deposits in arterial walls and narrows the artery, reducing blood flow. This narrowing is atherosclerosis, also called hardening of the arteries. The commonest cause of a heart attack or stroke is a ruptured plaque, which creates a clot at the rupture site and can cut off flow to body tissues, depriving them of oxygen and nutrients.
Materials entering the arterial wall from the bloodstream form the plaque. The book lists five: fat, cholesterol, calcium, waste products from cells, and the clotting agent fibrin. Cholesterol level is a deciding factor, and a high level of bad cholesterol signals higher risk of plaque buildup, which is why physicians test it.
Plaque buildup is a natural part of living, and even children and adolescents show early evidence of the process. The endothelium, the smooth inner lining of the artery, is damaged by high blood pressure and toxins in tobacco products. These factors, together with other causes of arterial lining inflammation, let cholesterol and other materials embed in the wall. Familial hypercholesterolemia, a genetic condition, causes abnormally high LDL and predisposes to atherosclerosis.
(b) Risk factors for cardiovascular disease
The book lists fifteen: age, gender, tobacco use, physical inactivity, excessive alcohol consumption, unhealthy diet, obesity, genetic predisposition and family history, raised blood pressure, raised blood sugar, raised blood cholesterol, undiagnosed coeliac disease, psychosocial factors, poverty and low educational status, and air pollution. Some are unmodifiable; others yield to lifestyle change, social change and drug treatment.
Age. Risk triples with each decade of life. Fatty streaks begin developing in arterial walls from adolescence. Eighty two per cent of people who die of CVD are 65 or older. Serum cholesterol rises with age in most populations, and the mechanical and structural properties of the vascular wall change with ageing, causing loss of arterial elasticity and then coronary artery disease.
Sex. Men carry greater risk than pre menopausal women, with coronary heart disease 2 to 5 times more common among middle aged men. Oestrogen protects glucose metabolism and the haemostatic system and may improve endothelial cell function directly. After menopause, oestrogen falls and female lipid metabolism turns atherogenic, with HDL falling and LDL and total cholesterol rising.
Physical inactivity and diet. Inactivity is a leading risk factor for mortality worldwide. One hundred and fifty minutes of moderate activity each week cuts the risk of ischaemic heart disease and diabetes mellitus by almost a third, and improves glucose control, blood pressure, lipid profile and insulin sensitivity.
On diet, excess saturated fat, trans fats and salt with low fibre intake raise risk, and excess salt is a major determinant of blood pressure. Replacing saturated fat with polyunsaturated fat cuts CVD risk, and cutting saturated fat reduces CVD risk by 17 per cent.
Conclusion. Atherosclerosis is deposition of a fatty, waxy plaque of fat, cholesterol, calcium, cellular waste and fibrin in arterial walls, narrowing the lumen, with rupture creating a clot that triggers heart attack or stroke.
Risk factors split into modifiable ones such as tobacco, inactivity, alcohol, diet, obesity, hypertension, diabetes, hyperlipidaemia and air pollution, and non modifiable ones such as age, gender and family history. Prevention rests on stopping smoking, 150 minutes of weekly activity, and replacing saturated fat with polyunsaturated fat.
Hormonal Regulation of Blood Glucose and the Insulin Glucagon Interplay
Explain the hormonal regulation of blood glucose level. Justify the statement: interplay of insulin and glucagon is essential for the maintenance of blood glucose level.
Normal blood glucose and the need for regulation
In a normal adult, blood glucose is held in a narrow range of about 70 to 140 mg per 100 ml, so that cells of various organs get an adequate supply. Most brain cells can use only glucose as an energy source. When blood glucose falls to 20 to 50 mg per dl, the person experiences hypoglycaemic shock, marked by fainting, seizure and even coma. The range is maintained by two pancreatic hormones, insulin and glucagon, which act antagonistically.
Action of insulin
Insulin promotes uptake of glucose by body cells and storage of excess dietary glucose as liver glycogen. After a meal, blood glucose rises as glucose is absorbed in the intestine, and this stimulates insulin release from pancreatic beta cells.
Insulin then promotes uptake of about two thirds of absorbed glucose into liver and muscle and its conversion to glycogen through glycogenesis, uptake and utilisation of glucose for energy by many other cell types, and conversion of surplus glucose to fat through lipogenesis once liver glycogen capacity is reached.
Action of glucagon and adrenaline
Between meals or in starvation, when blood glucose falls, stored glycogen is broken down to glucose and released into blood. Glycogenolysis is promoted by glucagon, secreted by pancreatic alpha cells when glucose falls.
Glucagon also promotes gluconeogenesis, the synthesis of glucose from amino acids in the liver. Adrenaline has a similar effect: released by the adrenal medulla during the fight, fright and flight response or on low blood glucose, it causes rapid breakdown of liver and muscle glycogen.
Justification of the interplay
Five points support the statement. First, the actions are antagonistic: insulin lowers glucose through uptake, glycogenesis and lipogenesis, while glucagon raises it through glycogenolysis and gluconeogenesis, so without one the other would push glucose to an extreme. Second, the system switches with feeding state, the insulin to glucagon ratio rising after a meal and falling between meals.
Third, brain and red blood cells depend on constant supply, and a fall to 20 to 50 mg per dl triggers hypoglycaemic shock, so glucagon's gluconeogenic role becomes life saving once glycogen is depleted.
Fourth, insulin's conversion of surplus glucose to fat links the carbohydrate and lipid axis, without which surplus glucose would accumulate dangerously in blood. Fifth, the same organ produces both hormones from spatially distinct cell populations under opposite stimuli, which is itself the structural basis for the interplay.
Glycaemic index and glycaemic load
Glycaemic Index is the blood glucose response after ingesting a 50 g carbohydrate portion of a test food compared with the same amount of carbohydrate in a reference food such as glucose, whose GI is 100. Low GI at 55 or below covers wheat chapati, lentils, boiled carrot, mango and full fat milk.
Moderate GI of 56 to 69 covers bajra roti, french fries, muesli, pineapple and popcorn. High GI at 70 or above covers whole wheat bread, boiled white rice, corn flakes and watermelon. Glycaemic Load equals GI divided by 100, multiplied by carbohydrate content, and is low at 10 or below, moderate at 10 to 19 and high at 20 or above.
Conclusion. Blood glucose is held between 70 and 140 mg per dl chiefly by the antagonistic interplay of insulin from beta cells in the fed state, driving glycogenesis and lipogenesis, and glucagon from alpha cells in the fasting state, driving glycogenolysis and gluconeogenesis, with adrenaline supplementing during emergencies.
The interplay is essential because brain and red blood cells need constant glucose, surplus must be stored safely, and severe hypoglycaemia below 50 mg per dl leads to coma.
That is five of the twelve. The remaining seven cover protein digestion and quality parameters, minerals, drug nutrient interaction with alcohol, food contaminants and mycotoxins, carbohydrates and dietary fibres, short notes on Z score, BMI, neutraceuticals and protein turnover, and food allergy with additives and adulterants.
Get all 12 BBCET 141 answers on WhatsApp 9899436384Complete Question Index of the BBCET 141 Guess Paper
All twelve BBCET 141 questions are listed below with their block, source unit and priority band, five of which are answered in full on this page and seven of which are sent after a WhatsApp enquiry.
Publishing the whole index rather than a teaser list is deliberate. You should know exactly what you are enquiring about before you message. If a topic you were counting on is missing, better to find that out now.
| Q | Question focus | Block and unit source | Priority | On this page |
|---|---|---|---|---|
| Q1 | Total Energy Expenditure, its three components, and factors affecting metabolic rate | Block 1, Unit 2, Energy Metabolism | High | Sample 1 |
| Q2 | Biochemical functions, RDA and deficiency of folic acid, niacin, vitamin K and vitamin D | Block 3, Units 7 and 8 | High | Sample 2 |
| Q3 | Biological functions and dietary sources of lipids, plus the two essential fatty acids | Block 2, Unit 5, Dietary Fats and Health | High | Sample 3 |
| Q4 | Protein digestion and absorption, and the five protein quality parameters including PDCAAS and DIAAS | Block 2, Unit 6, Dietary Proteins and Health | High | Sent after enquiry |
| Q5 | Biochemical significance, sources and deficiency of iron, calcium, zinc and iodine | Block 3, minerals unit | High | Sent after enquiry |
| Q6 | Atherosclerosis, atheromatous plaque formation, and fifteen cardiovascular risk factors | Block 4, Unit 11, Lifestyle Diseases | High | Sample 4 |
| Q7 | Effect of nutrients on drug absorption and metabolism, and alcohol induced micronutrient deficiency | Block 4, Unit 10, Food and Drug | High | Sent after enquiry |
| Q8 | Four classes of chemical contaminants in food, and eight named mycotoxins with their fungi | Block 4, food safety unit | High | Sent after enquiry |
| Q9 | Dietary requirement and four functions of carbohydrates, and the role of dietary fibres | Block 2, carbohydrates unit | High | Sent after enquiry |
| Q10 | Hormonal regulation of blood glucose, the insulin glucagon interplay, glycaemic index and load | Block 2 | High | Sample 5 |
| Q11 | Short notes on Z score, Body Mass Index, neutraceuticals and protein turnover | Blocks 1, 2 and 4 | Medium | Sent after enquiry |
| Q12 | Food allergy against food intolerance, plus food additives and adulterants under FSSAI 2006 | Block 4, food safety unit | Medium | Sent after enquiry |
Five samples on this page and seven answers sent after enquiry add up to the full set of twelve. If you also want past papers to practise these answers against under timed conditions, our IGNOU Previous Year Question Paper archive is the natural companion to this index.
BBCET 141 Block and Unit Coverage With Examined Topics
BBCET 141 Nutritional Biochemistry runs to four blocks and twelve units, and the guess paper draws at least one question from every block.
The table below maps each unit to the specific topics that have actually turned up in term end papers, not to a generic summary of the unit. If a row looks thin, that is because the unit itself is examined thinly, and that is useful information when you are deciding what to skip.
| Block | Unit | Topics that get examined | Guess paper Q |
|---|---|---|---|
| Block 1 | Unit 1 | Nutrient requirement, macronutrients against micronutrients, dietary reference intakes, EAR against RDA against TUL, metabolisable energy | Feeds Q1 and Q11 |
| Block 1 | Unit 2, Energy Metabolism | Total Energy Expenditure, BMR against RMR, Schofield equations, the 0.90 Indian correction factor, specific dynamic action, Physical Activity Ratio | Q1 |
| Block 1 | Unit 3 | Assessment of nutritional status, anthropometric indicators, Body Mass Index and Misra 2009 Indian cut offs, Z score and the malnutrition classification of Table 3.2 | Q11 |
| Block 2 | Unit 4 | Minimum carbohydrate intake of 100 to 130 g per day, AMDR of 45 to 65 per cent energy, free sugar restriction, soluble against insoluble fibre, bile acid binding | Q9 |
| Block 2 | Unit 5, Dietary Fats and Health | Triacylglycerol storage, micelle formation, membrane fluidity, cholesterol derived steroid hormones, linoleic and alpha linolenic acid, the n-6 to n-3 ratio | Q3 |
| Block 2 | Unit 6, Dietary Proteins and Health | Pepsinogen activation, pancreatic zymogens, brush border peptidases, amino acid transporters, NPU, biological value, amino acid score, PDCAAS, DIAAS, protein turnover | Q4 and Q11 |
| Block 3 | Unit 7, Water Soluble Vitamins | Tetrahydrofolate and one carbon transfer, NAD and NADP coenzyme roles, pellagra, megaloblastic anaemia, homocysteine and cardiovascular risk | Q2 |
| Block 3 | Unit 8, Fat Soluble Vitamins | Vitamin K cycle and clotting Factors II, VII, IX and X, calcitriol activation, Vitamin D Response Elements, rickets, osteomalacia, Nobel Prize attributions | Q2 |
| Block 3 | Unit 9 | Iron in haemoglobin and transferrin, calcium hydroxyapatite and PTH regulation, zinc finger metalloproteins, iodine in T3 and T4, iodised salt at 15 to 30 ppm | Q5 |
| Block 4 | Unit 10, Food and Drug | Bioavailability of drugs, calcium and tetracycline, grapefruit and CYP3A4, xenobiotic metabolism, thiamine and Wernicke Korsakoff, neutraceuticals | Q7 and Q11 |
| Block 4 | Unit 11, Lifestyle Diseases | Plaque composition, endothelial damage, familial hypercholesterolemia, fifteen CVD risk factors, type II diabetes, obesity and metabolic syndrome | Q6 |
| Block 4 | Unit 12 | Pesticide residues and POPs, Itai Itai and Minamata disease, acrylamide and BPA, eight mycotoxins, IgE mediated allergy against lactose intolerance, FSSAI additives and adulterants | Q8 and Q12 |
Block 4 deserves a note. It carries the highest question density in recent papers and the lowest study effort from most candidates, because food safety reads like general knowledge until you sit down and try to name eight mycotoxins with their producing fungi. Our BBCET 141 Study Material notes cover this block unit by unit if you want the underlying reading rather than the answers alone.
How This BBCET 141 Guess Paper Was Built From Six Term End Papers
Twelve questions were selected by tabulating every topic across six BBCET 141 term end papers from June 2023 to December 2025, then keeping only the topics that recurred in four or more of those six sessions.
The method is boring, which is the point. Each paper was read question by question, and each question was tagged to a block, a unit and a topic label. Topics were then scored on how many of the six sessions they appeared in. Nothing was included on instinct.
| Topic | Jun 2023 | Dec 2023 | Jun 2024 | Dec 2024 | Jun 2025 | Dec 2025 | Sessions |
|---|---|---|---|---|---|---|---|
| Energy expenditure, TEE, BMR, SDA | Yes | Yes | Yes | Yes | Yes | Yes | 6 of 6 |
| Minerals, iron, calcium, zinc, iodine | Yes | Yes | Yes | Yes | Yes | Yes | 6 of 6 |
| Drug nutrient interaction | Yes | Yes | Yes | Yes | Yes | Yes | 6 of 6 |
| Carbohydrates and dietary fibres | Yes | No | Yes | Yes | Yes | Yes | 5 of 6 |
| Lipids, functions and essential fatty acids | Yes | Yes | No | Yes | Yes | Yes | 5 of 6 |
| Protein digestion, absorption and quality | Yes | Yes | No | Yes | Yes | Yes | 5 of 6 |
| Cardiovascular disease and atherosclerosis | No | Yes | Yes | Yes | Yes | Yes | 5 of 6 |
| Food contaminants, chemical and microbial | Yes | Yes | Yes | Yes | Yes | No | 5 of 6 |
| Vitamins C, A, E and B12 | Yes | Yes | Yes | Yes | No | Yes | 5 of 6 |
| Vitamins folic acid, niacin, K and D | No | No | Yes | Yes | Yes | Yes | 4 of 6 |
| Hormonal regulation of blood glucose | Yes | No | No | Yes | Yes | Yes | 4 of 6 |
| Z score and nutritional status classification | No | No | Yes | Yes | Yes | Yes | 4 of 6 |
| Dietary guidelines, RDA and DRIs | No | Yes | No | Yes | Yes | Yes | 4 of 6 |
| Food additives and adulterants | No | No | No | No | Yes | Yes | 2 of 6 |
| Mycotoxins as a standalone question | No | Yes | No | No | No | Yes | 2 of 6 |
You can verify the December 2023 row yourself. IGNOU publishes past papers on its own portal, and the official BBCET 141 December 2023 question paper opens with total energy expenditure and specific dynamic action, and closes with mycotoxins and chemical contaminants, exactly as the table records.
Three topics with weak recurrence were deliberately left out: iron absorption mechanism at the transporter level, naturally occurring food toxicants, and protein energy malnutrition. Each appeared once or twice across six sessions. Including them would have padded the paper without improving your odds.
BBCET 141 Exam Pattern and Marking Scheme Explained
BBCET 141 is a three hour term end paper carrying 70 maximum marks, with all questions carrying equal marks and a choice built in, so you attempt only a subset of the questions printed.
The December 2023 paper published on the IGNOU webservices portal set nine questions and instructed candidates to attempt any seven. IGNOU has revised question counts on several BSCBCH papers since, so read the instruction line on your own hall paper before you start writing. The three hour duration and the 70 mark ceiling have held constant.
What matters more than the exact count is the internal structure. Most questions split into parts, either two halves of equal weight or a set of five mark sub questions. That split is your planning tool. A question asking for functions and sources of lipids in one half and essential fatty acids in the other is really two answers, and losing the second half costs you half the marks even if the first half is excellent.
Three things evaluators reward consistently in this paper. Open with a definition and, where the book names a scientist and year, use it. Give the mechanism with named enzymes and cofactors rather than a vague description of the process. Quote ICMR NIN, 2020 values for RDA, EAR and TUL, because this course is examined on Indian reference figures and generic Western values read as guesswork.
What to leave alone: wet laboratory protocol detail such as Kjeldahl titration steps or Folin Ciocalteu specifics, which belong to the practical course and are not tested here, and step by step regulation of glycolysis and the Krebs cycle, which sits in the earlier metabolism course rather than in Nutritional Biochemistry.
A Twelve Day BBCET 141 Revision Plan Using This Guess Paper
Twelve questions across twelve days works out at one question per day, with the last two days kept clear for timed writing practice rather than new reading.
Days one to three go to Block 1 and the energy questions, because Total Energy Expenditure has appeared in all six analysed sessions and the numbers in it, the 60 to 70 per cent, the 7 to 13 per cent, the Schofield equation, need repetition rather than understanding.
Days four to seven cover Block 2. Lipids, proteins and carbohydrates carry the heaviest content load, and the protein quality parameters in particular reward students who can write the NPU and biological value formulas correctly rather than describing them.
Days eight and nine take Block 3, the vitamins and minerals. Build a single sheet with every RDA, EAR and TUL value from the guess paper answers on it, and read that sheet daily from day nine onward. These numbers are the cheapest marks in the paper and the first thing candidates forget.
Days ten and eleven cover Block 4, food safety, drugs and lifestyle disease. Day twelve is a full three hour mock using an actual past paper, written by hand, timed, with no book open. Students who skip this step tend to run out of time on their fifth answer regardless of how well they know the content.
BBCEL 142 Practical Course and Its Link With BBCET 141 Theory
BBCET 141 is the four credit theory paper, while the practical component is a separate two credit course coded BBCEL 142 consisting of seven laboratory experiments, and this guess paper covers the theory paper only.
Students regularly confuse the two, which costs them time. The experiments in BBCEL 142 are built on the syllabus taught in BBCET 141, so the concepts overlap, but the assessment does not. A practical file is written up, submitted and evaluated separately from the three hour theory paper.
That separation cuts both ways. It means laboratory procedure detail will not be asked in your theory paper, which is why the skip list in the exam pattern section rules it out. It also means a strong theory result does not carry a weak practical file, and the two have to be prepared independently.
If you are working through several BSCBCH codes this semester rather than BBCET 141 alone, the BSCBCH Guess Paper set covers the other papers in IGNOU's Bachelor of Science (Honours) Biochemistry (BSCBCH) programme on the same frequency analysis method used here.
How to Get the Full BBCET 141 Solved Guess Paper on WhatsApp
Message 9899436384 on WhatsApp with the course code BBCET 141 and your target session, and the complete 45 page PDF with all twelve solved answers is sent to you after the enquiry is confirmed.
Five answers are already on this page. The other seven, covering protein digestion and quality, minerals, drug nutrient interaction with alcohol, food contaminants and mycotoxins, carbohydrates and fibres, the four short notes, and food allergy with additives and adulterants, come in the full PDF.
Say which session you are sitting when you message, because the frequency table gets refreshed after each term end cycle and you should receive the version built for your exam rather than an older one. If you are also taking other BSCBCH papers, mention those codes in the same message and the enquiry can be handled together.
Support number for all IGNOU enquiries: 9899436384.
BBCET 141 Guess Paper Questions Students Ask Most
What is the BBCET 141 Solved Guess Paper and what does it contain?
The BBCET 141 guess paper is a 45 page answer set containing twelve full length questions for IGNOU Nutritional Biochemistry. Each answer is written from the official study material and carries its block, unit and section reference. Five answers are published in full on this page and seven more are sent after a WhatsApp enquiry, covering all four blocks of the course from energy metabolism through to food safety.
Is BBCET 141 a compulsory course in the BSCBCH programme?
Yes. Nutritional Biochemistry is a core course of the B.Sc. (Honours) Biochemistry programme, offered in the fifth semester under the UGC CBCS scheme. The theory paper BBCET 141 carries four credits. A separate two credit laboratory course, BBCEL 142, runs alongside it with seven experiments. Both must be cleared, and they are assessed independently of one another rather than as a single combined result.
How many questions does the BBCET 141 term end examination carry?
BBCET 141 is a three hour paper with 70 maximum marks and all questions carrying equal marks. The December 2023 paper on the IGNOU portal printed nine questions and asked candidates to attempt any seven. Question counts have been revised on some BSCBCH papers since then, so check the instruction line printed on your own paper before you begin allocating time.
How were the BBCET 141 important questions in this guess paper selected?
Six BBCET 141 term end papers from June 2023 to December 2025 were read question by question. Every question was tagged to a block, unit and topic, then topics were scored by how many of the six sessions they appeared in. Only topics recurring in four or more sessions were kept. Three weakly recurring topics were deliberately excluded rather than included to inflate the page count.
Will this BBCET 141 guess paper alone be enough to pass the exam?
It is designed to work beside your IGNOU book, not to replace it. A guess paper narrows the field to the topics with the strongest recurrence record, which is a probability advantage rather than a guarantee. Students who read only the guess paper tend to write two strong answers and struggle with the rest. Read the twelve answers, then read the corresponding units.
Are the BBCET 141 answers written from the official IGNOU study material?
Yes. Every answer cites the block, unit and section it comes from, and figures such as the 0.90 Indian correction factor for BMR, the ICMR NIN 2020 RDA values and the Table 5.4 fatty acid percentages are taken from the book itself. Nothing is drawn from general nutrition textbooks, because evaluators mark against the IGNOU material rather than outside sources.
Does the BBCET 141 guess paper cover the BBCEL 142 practical file?
No. This guess paper covers the BBCET 141 theory paper only. BBCEL 142 is a separate two credit laboratory course with seven experiments, assessed through a practical file rather than the three hour written paper. Laboratory procedure detail such as titration steps is not asked in the theory examination, so it has been deliberately left out of all twelve answers.
How do I get the remaining BBCET 141 answers after reading the samples?
Message 9899436384 on WhatsApp with the course code BBCET 141 and the session you are sitting. The complete PDF with all twelve solved answers is sent once the enquiry is confirmed. Mentioning your session matters, because the frequency analysis is refreshed after each term end cycle and you should receive the edition prepared for your examination rather than an earlier one.