IGNOU BCHET 149 SOLVED ASSIGNMENT

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BCHET 149 2025 - English

ASSIGNMENT

Molecules of Life

Elective Course in Chemistry

Course Code: BCHET-149

Assignment Code: BCHET/TMA/2025

Maximum Marks: 100

Answer all the questions given below.

Part-A

1. a) Describe the biochemical composition of a living organism

b) Explain the structure and functions of mitochondria.

2. a) Why do monosaccharides form cyclic structure? Draw the structures of open chain and cyclic forms of glucose.

b) Taking D-glucose as an example explain the term mutarotation.

3. a) What is the principal structural difference between amylose and cellulose? Explain giving structures.

b) What is the difference between a fat and a fatty acid? Give definition of iodine number.

4. a) Describe the structural differences between a triacylglycerol and a phospholipid. Give one example in each case.

b) What are the similarities in composition amongst the four DNA nucleotides.

5. a) Describe the isoelectric point. With the help of an example explain the utility of this property of amino acids and how is it useful in maintaining pH in human systems.

Part-B

6. a) What is meant by active site of an enzyme? How do the binding groups and catalytic groups of an active site differ from each other?

b) What is the basic principle involved in the mechanism of enzyme action in biological reactions? Explain.

7.a) What is the significance of oxidative phosphorylation? Illustrate with the help of two examples.

b) How is the enzyme, pyruvate dehydrogenase complex different from other enzymes ? How does it function in the conversion of pyruvate to acetyl-CoA?

8. a) What are the similarities between DNA replication and RNA transcription?

b) Describe the factors that affect the immune response.

9. a) Describe the interrelationship amongst the metabolic pathways.

b) Write the steps of the degradation of amino acids and give a diagrammatic representation.

10. a) Describe the energetic of the degradation of fatty acids.

b) Explain the mechanism of drug action.

b) How are the peptides named? Write the structure of a tripeptide of your choice and write its full and abbreviated name.

 

BCHET 149 2026 - English

ASSIGNMENT

Molecules of Life

Elective Course in Chemistry

Course Code: BCHET-149

Assignment Code: BCHET-09/TMA-1/2026

Maximum Marks: 100

Answer all the questions given below.

PART-A

1.a) What are the various constituents of cell membrane? Describe the modes by which cell membrane controls the transport of ingoing and outgoing molecules.

b) Describe the classification of carbohydrates giving examples for each class.

2 a) Explain the significance of carbohydrates as blood group substances.

b) Describe the physical/chemical ways of detecting unsaturation in fatty acids. How does unsaturation affect the melting points of fatty acids

3. a) What are prostaglandins? Explain their physiological roles in human beings.

b) Giving the structures differentiate between a nucleotide and a nucleoside.

4. a) Describe and compare the various forms of DNA and explain the bonds that hold the double helix of the DNA together.

b) Describe the conversion of G-3-P into pyruvate during the glycolytic process.

5. Write short notes on the following:

a) Convention in biochemical energetics

b) Mechanism of muscle contraction

c) Regulation of glycogen metabolism

6. a) Describe the phenomenon of substrate channeling observed in the conversion of pyruvate into acetyl Co-A.

b) Taking the example of palmitic acid oxidation, explain the energetics of the fatty acid metabolism.

7. a) Name and describe in brief the processes involved in drug action.

b) Describe the role of enzymes in health sciences.

8.a) Describe the process of DNA replication and illustrate your answer.

b) What is genetic code? Enlist the characteristics of a genetic code.

9.a) What is meant by operon? Describe the expression process of Lac-operon of E. coli.

3 b) What is meant by drug-receptor complex? Explain the drug-receptor theory of biological activity of a drug.

10 . a) describe the steps involved in the energetics of the degradation of fatty acids.

b) Name the methods of determination of amino acids sequence in a protein and describe any one method

BCHET 149 2025 - Hindi

शिक्षक जांच सत्रीय कार्य

जैव अणु

रसायन में ऐच्छिक पाठ्यक्रम

पाठ्यक्रम कोड: बचेत-149

सत्रीय कार्य कोड: बचेत-149/त्मा/2025

कुल अंक : 100

निम्नलिखित सभी प्रश्नों के उत्तर दीजिए।

भाग-क

1. क) जीवों के जैविक संघटन की व्याख्या कीजिए।

ख) माइटोकॉन्ड्रिया की संरचना एवं कार्यों की व्याख्या कीजिए।

2. क) मोनोसैकेराइड चक्रीय संरचना क्यों बनाते हैं? ग्लूकोस की ऋजु श्रृंखला और चक्रीय रूपों की संरचनाएं बनाइए।

ख) ग्लूकोस का उदाहरण परिवर्ती ध्रुवण घूर्णन की व्याख्या कीजिए।

3. क) ऐमाइलोस और सैलूलोस के बीच संरचनात्मक अंतर क्या होता है? व्याख्या कीजिए।

ख) वसा एवं वसा अम्ल के बीच क्या अंतर होता है? आयोडीन संख्या को परिभाषित कीजिए।

4. क) ट्राइऐसिल ग्लिसरॉल एवं फॉस्फोलिपिड के बीच संरचनात्मक भिन्नताओं की व्याख्या कीजिए। प्रत्येक के लिए एक-एक उदाहरण दीजिए।

ख) चारों DNA न्यूक्लिओटाइडों के संघटन में क्या समानताएं हैं? व्याख्या कीजिए।

5. क) समविभव बिन्दु की व्याख्या कीजिए। एक उदाहरण की सहायता से ऐमीनो अम्लों के इस गुण की उपयोगिता की व्याख्या कीजिए तथा बताइए कि मनुष्यों में pH को बनाए रखने में यह किस प्रकार उपयोगी है?

ख) पेप्टाइडों को किस प्रकार नामित किया जाता है? किसी एक ट्राइपेप्टाइड की संरचना लिखिए तथा पूर्ण एवं संक्षेप में इसका नाम बताइए।

भाग-ख

6. क) एंज़ाइम के सक्रिय स्थल से आप क्या समझते हैं? सक्रिय स्थल के बंधन समूह तथा उत्प्रेरक समूह एक-दूसरे से किस प्रकार भिन्न होते हैं?

ख) जैविक अभिक्रियाओं में होने वाली एंजाइम क्रिया की क्रियाविधि का मूल नियम क्या है? व्याख्या कीजिए।

7. क) ऑक्सीकरणी फॉस्फोरिलीकरण का क्या महत्व होता है? दो उदाहरणों की सहायता से इसे समझाइए।

ख) एंजाइम, पाइरूवेट डिहाइड्रोजेनेस संकुल अन्य एंजाइमों से किस प्रकार भिन्न होता है? पाइरूवेट से ऐसीटिल-CoA के परिवर्तन में यह किस प्रकार कार्य करता है?

8. क) DNA-प्रतिकृति तथा RNA-अनुलेखन के बीच क्या असमानताएं हैं?

ख) प्रतिरक्षण अनुक्रियाओं को प्रभावित करने वाले कारक कौन-से होते हैं? उनकी संक्षेप में व्याख्या कीजिए।

9. क) उपापचयी पथों के बीच अंतः संबंध का वर्णन कीजिए।

ख) ऐमीनो अम्लों के अपचयन के चरणों को लिखिए तथा उनका आरेखी निरूपण दीजिए।

10. क) वसा अम्लों के निम्नीकरण की और्जिकी का वर्णन कीजिए।

ख) औषध क्रिया की क्रियाविधि की व्याख्या कीजिए।

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