BCHET149 EM 2023 SOLVED ASSIGNMENT

Description

Tutor Marked Assignment
Molecules of Life
Course Code: BCHET-149
Assignment Code: BCHET-149/TMA/2023
Maximum Marks: 100
Note: This assignment is based on all the four Blocks of the entire course.
PART-A
1. a) Describe the method for fractionation of subcellular organelles. (5)
b) What is the role of Golgi bodies in protein processing? Illustrate with the help of a
diagram. (5)
2. a) Name the storage polysaccharides present in animals and plants. Indicate the
structural differences between these. (5)
b) i) What are lipoproteins? Name the major groups of lipoproteins. (5)
ii) What is the significance of phospholipids in the membrane structure and function.
3. a) Why are the amino acids called -amino acids? The amino acids tyrosine and
tryptophan have nonpolar side chains; still these are placed in the uncharged polar
group, why? Write the advantages of polar side chains in the amino acids. (5)
b) Describe the stereochemistry of the peptide bond and explain how this is significant
in restricting the number of conformations of a polypeptide chain. (5)
4. a) How does the pH affect the activity of enzymes in the biological systems? Illustrate
your answer. (5)
b) What is the significance of vitamins and minerals in the living system? Write one
biochemical reaction in which the coenzyme of cyanocobalmin is associated and
explain the mechanism of the reaction. (5)
5. a) When is a reaction called spontaneous? Differentiate between ΔG and ΔG
o
and
describe their significance in predicting the direction of a biochemical reaction. (5)
b) What is meant by the turnover of ATP? How is oxidative phosphorylation related to
it? Write the steps involved in the phosphorylation process. (5)
PART-B
6. a) Differentiate between anabolism and catabolism. Write the mechanism of the
reaction of conversion of glyceraldehyde-3-phosphate to pyruvate. (5)
b) Describe the process of biosynthesis of fatty acids catalysed by fatty acid synthase. (5)
7. a) How is feedback regulation different from allosteric regulation? Name the most
important regulatory enzyme and its allosteric effector in the glycolytic pathway.
Also write the reaction catalysed by this enzyme. (5)
b) Define photophosphorylation. Differentiate between substrate level and oxidative
phosphorylation. (5)
4
8. a) Describe the structure and role of ribosome in protein synthesis. (5)
b) What are the advantages of using immobilized enzymes? How is the production of
enzymes from microorganisms carried out? (5)
9. a) Describe the role of DNA polymerase in DNA replication.
b) Describe the process of unwinding of the double helix during DNA replication. (5)
10. a) Name two carbohydrates that are metabolised by glycolysis. Write the reactions and
enzymes involved in their entry into the glycolytic pathway. (5)

b) Describe the pathways involved in the removal of amino group from amino acids. (5)