IGNOU BCHET-149 December 2023 Previous Year Question Paper

Q1.(a) Describe the DNA double helical structure.

(b) What are the for ces that account for the stability of the DNA double helix ?

Q2.(a) What are eicosanoids ? Explain their physiological functions. 5

(b) Differentiate between reducing and non - reducing sugars with suitable examples. 5 [ 2 ]

Q3.(a) How does the pH and temperature affect the activity of enzymes in the biological systems ? Illustrate your answer. 5

(b) Describe the conversion of fatty acids into acyl-CoA during the metabolic degradation of fatty acids.

Q4.(a) Describe the structure and role of ribosomes in protein biosynthesis. 5

(b) Write the characteristics of genetic code.

Q5.(a) Describe the role of DNA polymera se in DNA replication. 5

(b) “ATP is considered the energy currency of a cell.” Justify this statement.

Q6.(a) Describe electrophoresis as a technique for the separation of amino acids. 5

(b) Discuss any one method used for sequencing of amino acids.

Q7.(a) Differentiate betw een anabolism and catabolism. 5 [ 3 ] BCHET–149

(b) Write the reactions of conversion of glyceraldehyde-3-phosphate to pyruvate during glycolysis.

Q8.Write short notes on any two of the following : 5 each

(a) Photophosphorylation

(b) Complex polysaccharides

(c) Lipoproteins [ 4 ] BCHET–149 2023 -149 [ 5 ] BCHET–149 CoA ATP [ 6 ]