MICROBIOLOGY Question Papers (REGULAR, 2006)

SET : 1

1. Why are microbe s so useful to microbiologists as experimental models?

2. Give an account of cyanobacteria and their importance.

3. Describe with suitable examples viruses of Arthropods.

4. How does a bacteriophage introduce its nuecleic acid into host cell.

5. Discuss different types of assay methods for viruses.

6. Define growth. Describe the four phases of growth curve in a closed system and discuss the cause of each.

7. Write the effect of the following environmental factors on the growth of microorganisms

a) Solutes

b) pH

c) oxygen

d) osmotic pressure.

8. Discuss about the commonly used antimicrobial drugs and their uses.

SET : 2

1. Describe the contribution of the following people in the development of microbiology a) John Tyndall b) Alexander Fleming c) John Needham d) Francisco redi.

2. Explain the polyphasic taxonomy in prokaryotes.

3. How is viral taxonomy different from bacterial taxonomy?

4. Explain the entry of viruses into host cells.

5. Discuss various types of culture techniques of viruses.

6. What are nutrients? Describe major nutritional types of microorganisms.

7. Define water activity and briefly discuss how it can be determined. Why is it difficult for microorganisms to grow at low water activity (aw) values.

8. How can you alter treatment conditions to increase the effectiveness of a disinfectant.

SET : 3

1. HOW CAN YOU SAY THAT Kooch’s postulates are guidelines in identification of causative agent in disease?

2. Give an account of cyanobacteria and their importance.

3. Explain why some single stranded RNA viruses have positive strands while others have negative strands.

4. Explain the replication pathways of a bacteriophage.

5. What is a virus? Discuss various types of viral infections.

6. What are nutrients? Describe major nutritional types of microorganisms. (R)

7. Write short notes on :

a) Fixation

b) Simple staining

c) Dye

d) Preservation

8. What are the factors affecting sterilization and disinfection.

SET : 4

1. Discuss briefly Sergei Winogradsky technique in isolation of microorganisms?

2. Write about molecular chronometers and signature sequences used in the classification of organisms.

3. What is Hepatitis? Explain about hepatitis viruses.

4. How does a bacteriophage introduce its nucleic acid into host cell.

5. Write about the following :

a) Tissue culture cultivation of viruses.

b) Bacterial culture of viruses.

6. What are nutrients? Describe major nutritional types of microorganisms. (R)

7. Explain the influence of environmental factors on growth of microorganisms.

8. Briefly explain how the effectiveness of antimicrobial agents varies with population size, population composition, concentration or intensity of the agent, treatment duration, temperature and local environmental conditions.