LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & PLANT BIO-TECH.

FOURTH SEMESTER – APRIL 2011

PB 4508/PB 4504/PB 3500 – MICROBIOLOGY

 

 

 

Date : 07-04-2011              Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

PART-A (20 Marks)

Answer ALL  questions

 

1. Choose the correct answer                                                             (5X1=5 marks)

 

1. ______ method is used to stain Mycobacterium
2. Gram staining Acid-Fast staining    c. Simple staining   d.  Giemsa staining

 

2. Bacterial cells that exhibit a variety of shapes are called ______.
3. Pleomorphic Palisade   c. Trichomes   d. None of the above

 

3. When the viral genome can become integrated in to the bacterial genome, they are known as ______
4. Episome b. Prophage            c.Plasmids                    d.  None

 

4. The infection of a bacterium by the phage nucleic acid is known as _______
5. Transformation b. Conjugation           c. Transduction      d. recombination

 

5. Vinegar is otherwise called as _______
6. Citric acid b. Acetic acid  c. Lactic acid  d. Sulphuric acid

 

1. State whether the following statements are TRUE or FALSE         (5X1=5 marks)

 

6. Pure culture is otherwise known as axenic culture.
7. Facultative anaerobic bacteria are those which can grow without oxygen but

can utilize oxygen if it is present.

8. Generalized transduction provides a means for mapping bacterial genes.
9. Viruses infecting fungi are called cyanophages.
10. Rhizopus nigricans spoils bread

 

• Complete the following          (5X1=5 marks)

 

11. ______ introduced principle of aseptic surgery.
12. Culture medium that allows one to distinguish between or among different

microorganisms based on a difference in colony appearance is _______.

13. _______ is an agent that can carry a foreign DNA fragment into a host cell.

 

14. The zone of lysis produced by phages upon incubation on a lawn culture

of bacteria is known as _______.

15. Penicillin was discovered by ________.

 

1. Define the following                                                             (5X1=5 marks)

 

16. Monera
17. Lyophilization
18. Log Phase
19. Virion
20. BOD

PART-B

 

Answer the following each within 500 words.  Draw  diagrams wherever necessary

(5X7=35 marks)

 

21. a) List the contributions of:
22. Robert Koch (3.5 marks)
23. Louis Pasteur (3.5 marks)

(or)

 

1. b) Write the principle and procedure of Gram staining.

 

22. a) Describe the ultra structure of Bacterial cell.

 

(or)

 

1. b) Explain briefly any two methods of isolating pure culture.

 

23. a) Give an account on Enzymes: its nomenclature and characteristics.

 

(or)

1. b) Write notes on TCA cycle.

 

24. a) Briefly explain about the cultivation of viruses.

 

(or)

 

1. Give a brief account on classification of viruses.

 

25. a) Elaborate on the various practices used for food preservation.

 

(or)

 

1. b) Industrial production of Alcohol- Explain.

 

 

PART-C

 

Answer any THREE of the following, each with 1200 words

Draw  diagrams wherever necessary                                                                   (3X15=45 marks)

 

26. Discuss in detail about the major characteristics of microorganisms.
27. Describe in detail about the techniques used in the quantitative measurement

of bacterial growth.

28. Write in detail:
29. Conjugation (7.5 marks)
30. Transformation (7.5 marks)
31. Elaborate in detail about the structure and lytic cycle of Bacteriophages.
32. Give a detailed account on sewage treatment.

 

 

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