LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & ZOOLOGY

LM 08

FOURTH SEMESTER – APRIL 2006

                                             CH 4202 – BIO-CHEMISTRY FOR BIOLOGIST

(Also equivalent to CHE 202)

 

 

Date & Time : 22-04-2006/9.00-12.00         Dept. No.                                                       Max. : 100 Marks

 

 

PART – A

 

Answer ALL the questions.                                                               (10 X 2 = 20)

1. What is isoelectric point?
2. Give the structure of lecithin.
3. How is C- terminal of a peptide determined?
4. What are enzymes? How are they named?
5. Mention the roles of the various types of RNA.
6. What is a reducing sugar? Cite an example.
7. Give the net reaction of glycolysis.
8. Explain the enfleurage process.
9. List the uses of camphor.
10. Draw the structures of BHC and DDT.

PART – B

Answer any EIGHT questions only.                                                   (8 X 5 = 40)

11. Discuss the secondary structures of proteins.
12. Why do almost all enzyme catalyzed reactions show a pH optimum?
13. Write a short note on the classification of lipids.
14. What are anomers? Draw the anomeric structures of D-glucose and compare their stability.
15. Mention the monosaccharide units present in the following sugars:
16. Maltose b. Cellobiose   c. Lactose        d. Sucrose       e. Starch.
17. Discuss the different types of soil found in India.
18. Write a short note on N, P and K fertilizers.
19. Compare and contrast the two nucleic acids in their composition, secondary structure, bases present and their abundance in the body.
20. Illustrate the importance of hydrogen bonding in the base pairs of nucleic acids.
21. Write a short note on flavanoids.
22. What is isoprene rule? Explain it with an example.
23. Draw the geometrical isomers of citral. List the uses of citral.

 

 

PART – C

 

Answer any FOUR questions only.                                      (4 X 10 = 40)

23. Discuss the kinds of enzyme inhibition.
24. Discuss the citric acid cycle in detail.
25. a. Calculate the net gain of ATP in glycolysis of one mole glucose.             (3)
26. Write a short note on muta rotation.             (4)
27. What is denaturation of proteins? What are the factors influencing it? (3)
28. a. How are terpenoids classified? Give an example each. (5)
29. Explain the structure, physical properties and uses of α- pinene. (5)
30. a. What are cofactors? Brief the three kinds of cofactors with an example. (6)
31. What is iodine value of oil? How is it determined? What is its significance?  (4)
32. “DNA makes RNA and RNA makes proteins” – establish this with respect to the      biosynthesis of proteins.

 

 

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