LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

             B.Sc. DEGREE EXAMINATION – PLA. BIO&BIOTEC.&ADV.ZOO.&BIOTE.

GH 14

FOURTH SEMESTER – APRIL 2008

CH 4204 / 4202 – CHEMISTRY FOR BIOLOGISTS – II

 

 

 

Date : 24/04/2008                Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART – A

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

1. What is feed back inhibition ? Give an example.
2. Define iodine value of oil.
3. Give any two differences between DNA and RNA.
4. How will you prepare BHC ?
5. Explain about vanslyke method.
6. What is apoenzyme ?
7. Draw the structure of flavones.
8. How will you prepare glucaric acid from glucose ?
9. Give the structure of the following. i) Citral ii) a- Pinene
10. What is absolute specificity ?

 

PART – B

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

 

11. How will you form Gly-Ala peptide bond by Fisher’s third method ?
12. Explain about Lobryde Bruyn Van Elestein rearrangement.
13. Give the difference between plant and animal fatty acids.
14. Explain about hydrogen bonding between the nitrogenous bases in DNA.
15. How will you analyse C- terminal of aminoacid by enzymatic method ?
16. What is an alkaloid ? Give it’s classification.
17. Write short notes on superphosphate.
18. Show that D- glucose and D- fructose form the same osazone.
19. What are the steps involved in citric acid cycle ? Calculate the net ATP’s gained.
20. How did Haworth establish the presence of six membered ring in glucose.
21. What are the factors which affect the activity of the enzyme ? Explain any two.
22. Write short notes on rancidity.

 

 

 

PART – C

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

 

23. How will you convert the following :-
24. a) Aldohexose into aldopentose (6)
25. b) Aldopentose into aldohexose.                       (4)
26. Give the role of macro nutrients and explain each with examples.
27. Explain the mechanism of enzyme action.
28. What are fungicides ? Explain it with two examples.
29. Derive Michelis- Menton equation and explain each terms involved.
30. Discuss the following :-
31. a) Manufacture of Urea                                                                        (6)
32.  b) Three types of RNA                                                                         (4)

 

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