Previous Year Questions
2025
ZOOLOGY — HONOURS
Paper : DSCC-2
(Biochemistry)
Full Marks : 75
Section - A
1. Answer any ten questions :
2 × 10
(a) Give one example each of a reducing and a non-reducing disaccharide.
(b) What is epimerism?
(c) State the physiological importance of glycogen.
(d) What is ribozyme?
(e) Distinguish between fibrous protein and globular protein with example.
(f) Give one example each of an essential and a non-essential fatty acid.
(g) What is prostaglandin?
(h) Write the Michaelis-Menten equation.
(i) Give example of one competitive and one non-competitive enzyme inhibitor.
(j) What do you mean by a proenzyme?
(k) Differentiate between glucogenic and ketogenic amino acids.
(l) What do you mean by hexose monophosphate shunt?
(m) Define cerebrosides.
(n) What do you mean by protamine?
(o) How do free radicals cause DNA damage?
Section - B
2. Write short notes on any three of the following :
5 × 3
(a) Optical isomerism in monosaccharides
(b) Transamination
(c) Effect of temperature and pH on enzyme action
(d) Glycogenolysis
(e) Catabolism of Adenine nucleotide.
Section - C
Answer any four questions.
3. (a) Describe the process of gluconeogenesis from glycerate.
(b) What do you mean by saponification number? Mention its significance.
(c) What do you mean by allosteric modulation of an enzyme? Give one example. 4+(2+1)+(2+1)
(b) What do you mean by saponification number? Mention its significance.
(c) What do you mean by allosteric modulation of an enzyme? Give one example. 4+(2+1)+(2+1)
4. (a) Describe the process of β-oxidation of linoleic acid.
(b) Write down the electrochemical properties of α amino acids.
(c) What do you mean by induced fit model of enzyme action? 5+3+2
(b) Write down the electrochemical properties of α amino acids.
(c) What do you mean by induced fit model of enzyme action? 5+3+2
5. (a) Differentiate between co-factors and co-enzymes with examples.
(b) Explain the effect of uncompetitive enzyme inhibition on Vmax and Km values.
(c) Briefly describe the beneficial effects of antioxidants. (2+1)+4+3
(b) Explain the effect of uncompetitive enzyme inhibition on Vmax and Km values.
(c) Briefly describe the beneficial effects of antioxidants. (2+1)+4+3
6. (a) Describe the structure and function of triglycerides.
(b) Explain the fate of ketogenic amino acids.
(c) What do you mean by transdeamination? (2+2)+4+2
(b) Explain the fate of ketogenic amino acids.
(c) What do you mean by transdeamination? (2+2)+4+2
7. (a) Describe the roles of different components of fatty acid synthase multi-enzyme complex.
(b) Distinguish between homoglycan and heteroglycan with examples.
(c) What are Isozymes? Give example. 5+3+2
(b) Distinguish between homoglycan and heteroglycan with examples.
(c) What are Isozymes? Give example. 5+3+2
8. (a) What is TCA cycle? Describe the steps of TCA cycle with suitable diagram.
(b) Explain the process of branching during glycogenesis. (2+5)+3
(b) Explain the process of branching during glycogenesis. (2+5)+3
9. (a) Distinguish between parallel and antiparallel β-pleated sheet with diagram.
(b) What do you mean by investment phase and pay-off phase of glycolysis?
(c) Classify amino acids on the basis of their R-groups. 3+3+4
(b) What do you mean by investment phase and pay-off phase of glycolysis?
(c) Classify amino acids on the basis of their R-groups. 3+3+4
2024
ZOOLOGY — HONOURS
Paper : DSCC-2
(Biochemistry)
Full Marks : 75
Section - A
1. Answer any ten questions :
2 × 10
(a) Define Anomerism.
(b) Distinguish between glycosidic bond and peptide bond.
(c) What do you mean by 'aldo' sugar and 'keto' sugar?
(d) What are zwitterions?
(e) Name two essential amino acids.
(f) What do you mean by Q10 value of an enzyme?
(g) What is isozyme?
(h) Define carnitine shuttle.
(i) What is saponification number of fats?
(j) Define phospholipid with example.
(k) What is transdeamination?
(l) Mention the significance of gluconeogenesis.
(m) Define PUFA.
(n) What are free radicals? Give one example.
(o) What is an antioxidant? Give one example.
Section - B
2. Write short notes on any three of the following :
5 × 3
(a) Pentose phosphate pathway
(b) Oxidative and Non-oxidative deamination
(c) Competitive and Non-competitive enzyme inhibition
(d) Salting out of protein
(e) α-helix and β-pleated sheet.
Section - C
Answer any four questions.
3. (a) Describe the process of gluconeogenesis from lactate.
(b) Define Iodine number of fat. Mention its significance.
(c) What do you mean by feedback inhibition of an enzyme? Give one example. 5+(1½+1)+(1½+1)
(b) Define Iodine number of fat. Mention its significance.
(c) What do you mean by feedback inhibition of an enzyme? Give one example. 5+(1½+1)+(1½+1)
4. (a) Describe the process of β-oxidation of palmitic acid.
(b) What are aromatic amino acids? Give one example.
(c) What do you mean by Lock and Key model? 5+(1+1)+3
(b) What are aromatic amino acids? Give one example.
(c) What do you mean by Lock and Key model? 5+(1+1)+3
5. (a) Establish the Michaelis-Menten equation with suitable derivation.
(b) Distinguish between saturated and unsaturated fatty acids.
(c) How do free radicals cause base modification in DNA? 5+2+3
(b) Distinguish between saturated and unsaturated fatty acids.
(c) How do free radicals cause base modification in DNA? 5+2+3
6. (a) What do you mean by E.C. number of an enzyme? Explain with an example.
(b) Discuss the purine salvage pathway with suitable diagrams.
(c) Give examples of one reducing and one non-reducing sugar. (1+2)+(3+2)+(1+1)
(b) Discuss the purine salvage pathway with suitable diagrams.
(c) Give examples of one reducing and one non-reducing sugar. (1+2)+(3+2)+(1+1)
7. (a) How do antioxidants protect cells from free radical induced damage?
' (b) Explain the Lineweaver-Burk plot. Mention its significance.
(c) Explain the rate limiting step of glycolysis. 3+(3+1)+3
' (b) Explain the Lineweaver-Burk plot. Mention its significance.
(c) Explain the rate limiting step of glycolysis. 3+(3+1)+3
8. (a) Write a note on the functions of citrate synthase and transketolase.
(b) Discuss the energy budget of glycolysis.
(c) Give examples of one glucogenic and one ketogenic amino acid. (2½+2½)+3+(1+1)
(b) Discuss the energy budget of glycolysis.
(c) Give examples of one glucogenic and one ketogenic amino acid. (2½+2½)+3+(1+1)
9. (a) Describe the citric acid cycle with suitable flow diagram.
(b) What do you mean by 'cis' and 'trans' double bonds in an unsaturated fatty acid?
(c) What is the function of the enzyme pyruvate kinase? (4+2)+2+2
(b) What do you mean by 'cis' and 'trans' double bonds in an unsaturated fatty acid?
(c) What is the function of the enzyme pyruvate kinase? (4+2)+2+2
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