Indira Gandhi National Open University (IGNOU) 2005 B.Sc Chemistry Bio - - Question Paper
CHE-9
BACHELOR OF SCIENCE (B.Sc.) Term-End Examination June, 2005 CHEMISTRY CHE-9 : BIOCHEMISTRY
Time : 2 hours Maximum Marks : 50
Note : Answer any five questions. AH questions carry equal marks.
1, (a) Define and explain the significance of ; 6
(i) Km
(ii) Isoenzymes
(b) Name two peptides with biological activity. Describe
the function of one of them briefly. 4
2. (a) Briefly discuss different stages of protein synthesis. 6
(b) Differentiate between codons and anticodons. What is the importance of initiation' and termination codons ? 4
3. (a) Give a brief account of gluconeogenesis. 4
(b) Give two examples of adequate proteins. Name any four of the essential amino acids. 3
(c) Define isoelectric point. How d6 the amino acid molecules behave in acidic or basic medium ? 3
4. (a) Write down the types of biological reactions with
which the following vitamins are associated. Give one disease each caused by the deficiency of these
(i) Niacin
(ii) Folic acid
(iii) Biotin
(iv) Pantothenic acid
(v) Cyanocobalamine
(b) What are uncouplers and how do they act ? Give one example of an uncoupler.
2-*2
5. Differentiate between the following pairs :
24=10
(i) Substrate level and Oxidative phosphorylation
(ii) DNA polymerase and RNA polymerase
(i ii) Chloroplast and Mitochondria
(iv) Competitive and Non competitive inhibition of enzyme
6* (a) What are essential fatty acids and why arc they
essential ? 2
(b) Name the different types of lipoproteins found in plasma. What is their functional role ? 4
(c) Discuss the important functions associated with any four trace elements. 4
7. Write short notes on any four of the following : 2x4=lQ
2
(a) Eicosanoids
(b) t-RNA
(c) Immobilized enzymes
(d) Cellular immunity
(e) S-phase of cell cycle
CHE-9 3
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