LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – CHEMISTRY
FIFTH SEMESTER – APRIL 2012
CH 5404 – BIO CHEMISTRY
Date : 30-04-2012 Dept. No. Max. : 100 Marks
Time : 1:00 – 4:00
Part A
Answer ALL questions. (10 x 2 = 20 Marks)
- What is a peptide bond?
- Define denaturation of a protein.
- Give an example for the geometric specificity of an enzyme.
- Mention the significance of enzymes in the kinetics of the reaction.
- Define RM value of a fat.
- Draw the structure of cholesterol.
- Mention the differences between amylose and amylopectin.
- What are disaccharides? Give an example.
- Mention any two differences between DNA and RNA.
- Define genetic code.
Part B
Answer any EIGHT questions (8 x 5 = 40 Marks)
- How is Sanger’s method useful for the determination of amino acid sequence?
- Mention the differences between plant and animal fats.
- Briefly discuss the primary structure of proteins.
- What are the factors affecting the enzyme activity? Explain.
- What are phospholipids? Explain the types of phospholipids.
- Explain the mechanism of electron transport chain.
- What is payoff phase? Explain the steps involved.
- Discuss briefly the translation process.
- Mention any five salient features of biological oxidation.
- Draw and explain the replication of DNA.
- Define rancidity? Explain the types of rancidity.
- Draw and explain the structure of t-RNA.
Part C
Answer any FOUR questions (4 x 10 = 40 Marks)
- Explain the secondary structure of proteins.
- What is enzyme inhibition? Explain any two types of enzyme inhibition.
- ) Discuss the β-oxidation theory of fatty acids.
b.) Explain the coenzyme action in brief. (5 + 5)
- Draw and explain the steps involved in TCA cycle.
- Explain in detail the characteristics of enzymes.
- Draw and explain the double helical structure of DNA.
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