LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
M.Sc. DEGREE EXAMINATION – BIO TECHNOLOGY
FIRST SEMESTER – APRIL 2007
IB 22
BT 1807 - MICROBIOLOGY
Date & Time: 25/04/2007 / 1:00 - 4:00
Dept. No.
Max. : 100 Marks
PART A
(20 marks)
Answer all the questions
I. Choose the correct answer:
(5x1=5)
1.The dsDNA virus is
(a)Picorna (b) Pox (c) Corona (d) Parvo
2. The site of CO2 fixation in prokaryote is
(a) ribosomes
(b) mesosomes
(c) carboxysomes
(d)oxysomes.
3. Hide Porter’s disease is caused by
(a) Bacillus sp.
(b) Pseudomonas sp. (c) Salmonella sp.
(d) Vibrio sp.
4.Thermolabile substance can be sterilized by
(a) Incineration
(b) dessication
(c) radiation (d) filtration.
5.The strain commercially used for the production of vitamin B12 is
(a) Achromobacter (b) Chlorobium (c) Alcaligenes (d) Propionibacterium.
II. State True or False; if false state the reason.
(5x1=5)
5.Influenza virus is an example of enveloped helical virus.
6.One gene one enzyme theory hypothesis was proved using E.coli.
7. Denitrification is the release of ammonia from nitrate.
8.The term ‘Phagocytosis’ was coined by Metchnikoff.
9. Tetracycline is produced from Streptomyces erythreus.
10. The facilitated diffusion requires carrier proteins.
III. Complete the following:
(5x1=5)
11. The other term used for fractional sterilization is ------------------------12. The term ‘antibiotic’ was coined by ------------------ & -----------------13. Rhizosphere effect is an example of -------------------- association.
14. -------------------- & ----------------- are the toxins produced by E.coli.
15. The term used to denote the movement of organisms towards chemical attractants
is --------------------------IV. Answer the following questions in 50 words.
16. What are Sub-unit vaccines?
17. What are Siderophores.?
18. What is Mycoplasma?
19. Define the term Commensalism.
20. Explain the term Botulism?
(5x1=5)
PART B
V. Answer any five of the following, each within 350 words only:
(5x8=40)
21. Give an outline of fungal classification.
22. Describe the various methods of culture preservation.
23. Critically comment on the industrial applications of various Bacillus species.
24. Describe the biogeochemical cycling of nitrogen.
25.Give a brief account on microbial toxins.
26. Write a brief note on the general features of Actinomycetes. How are they
classified?
27. Give a brief outline on the industrial production of vinegar.
28. Illustrate the process of penicillin biosynthesis.
PART C
VI Answer the following, each within 1500 words:
(2x20=40)
29. (a) What is sterilization? Explain in detail the physical and chemical methods of
Sterilization.
(or)
(a) Bring about the salient features of the asexual and sexual reproduction in fungi.
Describe the multiplication process of “T” even phages.
30. (a) Explain the mechanism of Symbiotic and Non-symbiotic Nitrogen fixation.
(or)
(b)Give a detailed account on bacterial and algal SCP. Add a note on its uses and
advantages.
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