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IGNOU BCHET-149 (January 2025 – December 2025) Assignment Questions
IGNOU BCHET-149 (January 2024 – December 2024) Assignment Questions
Part-A
1. a) Differentiate between a prokaryotic and a eukaryotic cell in terms of their structure.
b) How are lysosomes formed in the cells. Describe their role within the cell.
2. a) What do capital letters D and L signify in the context stereochemistry of monosaccharides? Explain with the help of an example.
b) Write a reaction that is used in distinguishing an aldose from a ketose. How does an aldose react with phenylhydrazine? Give the reaction involved and explain.
3. a) What is milk sugar? How is it formed? Explain giving the reaction.
b) How are amino acids represented? Explain with the help of an example. Describe in brief the configuration of amino acids.
4. a) Describe the behaviour of amino acids in acidic and basic medium. What is the significance of their Zwitterionic Nature?
b) How is peptide bond formed? Explain the stereochemistry of a peptide bond.
5. a) Describe in brief the Merrifield solid phase synthesis of peptides.
b) Describe the covalent interactions involved in protein folding.
Part-B
6. a) Explain the physiological aspect of specificity of enzyme action that distinguishes it from the non-enzyme part in a catalyst.
b) What is Michaelis-Menton equation? Describe its significance in affecting the rate of an enzymatic reaction.
7. a) Describe the structural and functional basis of classification of lipids.
b) What are phospholipids? Describe in brief the different classes of phospholipids.
8. a) Differentiate between nucleosides and nucleotides and illustrate your answer.
b) Name and describe the experiment which proved that ‘DNA is the material that communicates the genetic information’.
9. a) What are coupling reactions? Explain their significance in biochemical reactions.
b) Write the mechanism of conversion of G-3-P into pyruvate.
10. a) What is substrate chanelling in Kreb’s cycle? Explain.
b) Compare the degradation and the biosynthesis of fatty acids.
