About This Solved Paper
| Prepared by | Unnati Education, IGNOU-experienced academic content team |
| Qualification | Graduate with specialization in Biochemistry and Life Sciences |
| Programme | IGNOU Bachelor of Science General (BSCG) and Bachelor of Science Multidisciplinary (BSCM Four Year Under Graduate Programme) |
| Institution Reference | IGNOU Term-End Examination December 2025 |
BCHET-149 is a subject that rewards students who understand how living systems work at the molecular level. The December 2025 Term-End Examination covered cell biology, biomolecules, enzymes, lipids, and metabolic pathways like the urea cycle. That's a wide syllabus for a two-hour paper. Studying the actual BCHET 149 Question Paper December 2025 with structured solutions helps you understand IGNOU's answer expectations, manage your time across five questions, and focus your revision where it matters most.
Download Now | Get BCHET-149 Solved Question Paper December 2025 IGNOU
The complete IGNOU BCHET-149 question paper with expert-written solutions is available now. WhatsApp us your course details and we will send the full BCHET-149 December 2025 solved paper directly to you.
What is BCHET 149 Question Paper December 2025?
The BCHET 149 December 2025 question paper is a 50-mark IGNOU Term-End Examination for BSCG students covering Molecules of Life, where students attempt any 5 of 8 descriptive questions in 2 hours with equal marks per question.
BCHET-149 sits within the IGNOU Bachelor of Science (General) programme as a biochemistry-focused course. Questions span cell organelle functions, carbohydrate chemistry, protein structure, enzyme classification, lipid roles, and metabolic cycles. Each question carries 10 marks and often has two sub-parts, so answers need both depth and clarity to score well.
About IGNOU BCHET-149 | Molecules of Life
BCHET-149 connects chemistry and biology at the molecular scale. You study how mitochondria produce energy, how enzymes catalyse reactions, how amino acids build proteins, and how the urea cycle removes nitrogenous waste. In practice, students who prepare diagrams alongside written explanations score considerably better. The subject rewards those who can explain mechanisms step by step rather than just recall facts. Unnati Education's solved paper is built around exactly that kind of answer structure.
BCHET 149 Exam Pattern and Marks Breakdown
This paper carries 50 marks in total. There are 8 questions and students must attempt any 5. Each question carries 10 marks. Most questions contain two sub-parts worth 5 marks each, though some questions like Q5 and Q8 are worth the full 10 marks as single-part questions. The examination duration is 2 hours. Descriptive answers with diagrams are expected for cell biology and metabolic pathway questions.
All Questions | BCHET 149 Question Paper December 2025 IGNOU (Complete List)
- (a) Discuss the structure and function of mitochondria, highlighting their role in cellular energy production. 5 (b) Match the following : 5 (i) Light harvesting organelles - (1) Energy currency of a cell (ii) Peroxysomes - (2) Chloroplast (iii) Vacuoles - (3) Powerhouse of cells (iv) Mitochondria - (4) Hydrogen peroxide decomposition (v) ATP - (5) Storing and transport of nutrients
- (a) What are lysosomes ? Describe their function and significance in a eukaryotic cell. 5 (b) Write short notes on the following : 2×2=5 (i) Cytoskeleton (ii) Insulin
- (a) Write the product(s) that are obtained when D-glucose reacts with the following : 5 (i) Conc. Sulphuric acid (ii) Bromine water (iii) Nitric acid (iv) Tollen's reagent (v) Three equivalents of phenyl hydrazine (b) Write three different tests used to differentiate reducing and non-reducing sugars. Why is Sucrose classified as non-reducing sugar while Maltose and Lactose are considered reducing sugars ? 5
- (a) Describe the stereochemistry of peptide bond. 5 (b) Describe the classification of amino acids based on the nature of R-group. 5
- Name any five major classes of enzymes as classified by Enzyme Commission (EC). Write one example for each class and the type of reaction they catalyse. 10
- (a) Define the following in the context of mechanism of drug action : 5 (i) Stimulation (ii) Depression (iii) Irritation (iv) Replacement (v) Cytotoxic action (b) Explain the difference between competitive and non-competitive inhibition of enzymes. 5
- (a) What are the three main roles that lipids play in the human body ? Explain. 5 (b) Describe the differences between sphingolipids and phospholipids. 5
- Describe the steps involved in the urea cycle using a diagram. 10
BCHET 149 Syllabus Topics Covered
The December 2025 paper covers cell biology through mitochondria, lysosomes, and organelle functions. Carbohydrate chemistry is tested through D-glucose reactions and sugar classification. Protein topics include peptide bond stereochemistry and amino acid classification by R-group. Enzymes appear in questions on EC classification, competitive inhibition, and drug action mechanisms. Lipid roles and the urea cycle complete the metabolic coverage in this paper.
Sample Answer Preview | BCHET 149 Molecules of Life Solved Question Paper
Take Question 6(b) on enzyme inhibition. A strong IGNOU answer would explain that in competitive inhibition, the inhibitor structurally resembles the substrate and competes for the active site. Increasing substrate concentration reverses the inhibition. In non-competitive inhibition, the inhibitor binds to an allosteric site and changes the enzyme's shape, so it cannot be reversed by adding more substrate. Vmax decreases in non-competitive inhibition while Km remains unchanged. Get the complete BCHET-149 solved question paper from Unnati Education for all questions answered in this structured format.
How to Write High-Scoring Answers in BCHET 149 exam
Here's the important part for this paper: diagrams are not optional. Questions on mitochondria, the urea cycle, and molecular orbital transitions expect labelled diagrams alongside written explanations. For 5-mark sub-parts, aim for 150 to 200 words with clear headings. For full 10-mark questions like Q5 and Q8, use a tabular format or numbered points to show all five enzyme classes or all urea cycle steps. IGNOU examiners reward completeness and logical flow.
Who Should Use This BCHET-149 Solved Question Paper December 2025?
First-attempt BSCG students preparing for BCHET-149 will find this resource useful for understanding the answer depth IGNOU expects. Repeat candidates benefit from comparing their previous answers with structured solutions. Self-study learners who find biochemical pathways or enzyme mechanisms confusing get a step-by-step reference built from the actual December 2025 paper. Students who need diagram guidance for the urea cycle or cell organelle questions will also find significant value here.
Why This Is Better Than Free BCHET-149 December 2025 Question Paper PDFs and Telegram Files
Free Telegram PDFs give you questions without answers. Most students already have the question paper. What they actually need is a structured, marks-aware answer for each question. Unnati Education's BCHET-149 December 2025 solved paper includes labelled diagram guidance, biochemical pathway explanations, and IGNOU-format answer lengths for every attempted question. That is the gap between a scanned question paper and a genuine exam preparation resource.
Student Reviews | BCHET-149 Solved Question Paper by Unnati Education
Ritu Gupta, BSCG Student: "The urea cycle answer in the BCHET-149 December 2025 solved paper was exactly what I needed. The diagram guidance made a complicated topic straightforward."
Arjun Mishra, IGNOU Lucknow: "Enzyme classification and drug action mechanisms were things I kept confusing. The BCHET 149 solved paper from Unnati cleared both topics in one reading."
Sunita Rawat, BSCG Repeat Candidate: "I failed my first attempt because I did not know how much to write. The solved paper showed me the correct answer length and structure for every question type."
How to Get the BCHET-149 Solved Question Paper December 2025 | Step by Step
- WhatsApp Unnati Education and mention BCHET-149 December 2025.
- Share your name and IGNOU programme details.
- Our team confirms your requirement and sends you the full solved paper digitally without any delay.
Frequently Asked Questions
What is BCHET-149?
BCHET-149 is a biochemistry course titled Molecules of Life offered in IGNOU's Bachelor of Science General (BSCG) programme. It covers cell organelles, biomolecules including carbohydrates, proteins and lipids, enzyme classification and inhibition, mechanisms of drug action, and metabolic pathways including the urea cycle. The Term-End Examination carries 50 marks and students must attempt any 5 of 8 questions. Both descriptive writing and labelled diagrams are expected for full marks in this paper.
What is the exam pattern and marks distribution for BCHET 149 December 2025?
The BCHET 149 December 2025 paper contains 8 questions and students must attempt any 5. Each question carries 10 marks, making the total 50 marks. Most questions have two sub-parts of 5 marks each, while Q5 on enzyme classes and Q8 on the urea cycle are single full-question items worth 10 marks. The exam duration is 2 hours. Students should choose their 5 questions based on topic preparation and allocate roughly 20 to 22 minutes per question.
Which topics are most important in BCHET-149 Molecules of Life?
Key topics include structure and function of mitochondria, lysosomes and cytoskeleton, D-glucose reactions, reducing versus non-reducing sugars, stereochemistry of peptide bonds, amino acid classification by R-group, EC enzyme classification with examples, competitive and non-competitive enzyme inhibition, mechanisms of drug action, roles of lipids including sphingolipids and phospholipids, and steps of the urea cycle with a labelled diagram. Questions on enzymes and the urea cycle carry maximum marks and have appeared consistently.
How can I download the IGNOU BCHET-149 question paper for December 2025?
You can get the BCHET-149 December 2025 question paper with complete solutions directly from Unnati Education by WhatsApp. The IGNOU official website also publishes question papers after the examination cycle closes. For solved versions with expert-written answers, diagram guidance, and IGNOU-aligned answer lengths, Unnati Education is the most reliable option available for BSCG biochemistry students who want to prepare seriously and improve their Term-End Examination performance.
About Unnati Education | IGNOU Study Material Experts
Unnati Education has been helping IGNOU students across India prepare for Term-End Examinations through solved question papers, study material, and important questions. Our biochemistry and life sciences resources are prepared by subject-experienced academic writers and reviewed for accuracy. We understand how IGNOU structures marks within descriptive papers and design every resource around that understanding. Students from Delhi, Haryana, Uttar Pradesh, Rajasthan, and across the country have relied on us for BSCG preparation.
Explore More IGNOU BCHET-149 Solved Papers and Study Material
Explore the BCHET-149 Important Questions Booklet for the current session. Access BCHET-149 Assignment Solutions prepared by Unnati Education. Find chapter-wise notes on biomolecules and enzyme chemistry for BCHET-149. Browse IGNOU BSCG previous year solved question papers across all life science courses. s to respective pages]
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The BCHET 149 Question Paper December 2025 with complete solutions is ready for you. Do not go into your exam without knowing how IGNOU expects you to write about mitochondria, enzyme inhibition, or the urea cycle. WhatsApp Unnati Education today and we will send it to you right away.