IGNOU BCHET-149 June 2023 Previous Year Question Paper

Q1.(a) What is Urea Cycle ? Write the various steps involved in urea cycle. 5

(b) Briefly describe the elongation of polypetide chain during protein biosynthesis.

Q2.(a) How does the fluid mosaic model expla in the membrane permeability ? Elaborate. 5

(b) How does an enzyme contribute to the lowering of energy of activation of a bio - chemical reaction ? Explain.

Q3.Write short notes on any two of the following : 5+5

(a) Gluco-neogenesis

(b) Electron transport chain

(c) Ketone bodies

Q4.(a) Describe the method for fractionation of sub-cellular organelles. 5

(b) Explain the role of Golgi bodies in protein processing with the help of a diagram.

Q5.(a) Describe in brief the role of ATP in biochemical energy transformation. 5

(b) Write the process of conversion of glucose into triose phosphates during glycolysis.

Q6.(a) Write the Kiliani -Fischer synthesis for chain elongation of aldoses. 5

(b) Giving suitable examples , describe storage polysaccharides.

Q7.(a) Describe the Hershey and Chase experiment that proved DNA as the genetic material. 5

(b) Describe the structure and functions of t-RNA.

Q8.(a) Write the classification of amino acids based on the nature of R group. 5

(b) Enumerate the biological functions of lipids. 5 2023 -149 5+5 ATP DNA t-RNA BCHET–149 7,1

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