LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – CHEMISTRY & ADV. ZOOLOGY
THIRD SEMESTER – APRIL 2012
PB 3206/3200 - GENERAL MICROBIOLOGY
Date : 02-05-2012
Time : 9:00 - 12:00
Dept. No.
Max. : 100 Marks
PART A
Answer the following, each answer within 50 words:
(10 x 2 = 20 marks)
1. What are blue green algae?
2. Define zoophages.
3. Distinguish between heterotrophs and autotrophs.
4. Define doubling time.
5. What is a Hfr strain?
6. What is a plasmid?
7. Define phyllody.
8. What is a macrocyclic fungi?
9. What are oxidation ponds?
10. Mention the source and uses of proteases.
PART B
Answer the following, each answer within 500 words:
Draw diagrams wherever necessary:
(5 x 7= 35 marks)
11. a. List out the characteristic features of algae.
(or)
b. Mention the features of fungi.
12. a. Write notes on bacterial nutrition.
(or)
b. Explain the methods used for the isolation of bacteria.
13. a. Briefly explain transduction in bacteria.
(or)
b. Write short notes on bacterial conjugation.
14. a. Give an account of the symptoms, disease cycle and control measures of tobacco
mosaic disease.
(or)
b. Briefly write about the pathogen, symptoms and control strategies of citrus canker.
15. a. Write notes on the objectives of wastewater treatment.
(or)
b. Explain the methods used for the production of penicillin.
PART C
Answer any three of the following, each answer within 1200 words:
Draw diagrams wherever necessary:
(3 x 15= 45 marks)
16. Discuss in detail about the characteristic features and classification of viruses. Add a note on their
cultivation.
17. Explain the ultrastructure of bacterial cell.
18. Write notes on the replication of DNA in bacteria.
19. Give an account of the disease caused by Puccinia graminis in wheat and the various stages in the
disease cycle.
20. What is microbial spoilage of food? Write notes on the methods used for preservation of food from
microbial spoilage.
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