IGNOU BBCET-143 Assignment 2025 – Questions with Answer Links

ASSIGNMENT

Basic Microbiology

Core Course in Biochemistry
Course Code: BBCET-143
Assignment Code: BBCET-143/TMA/2025
Maximum Marks: 100

Note: Attempt all questions. The marks for each question are indicated against it.
Write the answers in your own words; do not copy from the course material.

PART-(A) Marks: 50

1. (a) List the principles postulated by Robert Koch for identification of disease causing agents. (5)
   (b) Explain the general features of five kingdoms proposed by Whittaker. (5)
2. (a) Which desirable properties should be present in a genomic sequence for it to serve as the molecular marker of microbial characterization/identification? (5)
   (b) What is numerical taxonomy? How is it used for classification? (5)
3. (a) Explain the generalized life cycle in fungi with the help of a suitable diagram. (5)
   (b) Discuss different modes of nutrition in protozoans. (5)
4. (a) Explain the classification of eubacteria based on their shapes and cell wall composition. (5)
   (b) Write features of cyanobacteria and alphaproteobacteria. Give one example of each. (5)
5. (a) Discuss five general characteristics of archea. (5)
   (b) Describe the replication cycle of Influenza virus. (5)

PART-(B) Marks: 50

6. (a) Explain the terms antigenic shift and antigenic drift. (5)
   (b) Give a brief description of ultrastructure of algae with a suitable diagram. (5)
7. (a) Write short notes on mycotoxins and mucormycosis. (5)
   (b) Explain the cause and types of leishmaniasis. (5)
8. (a) Discuss the effect of temperature and pH on microbial growth. (5)
   (b) Explain the phases of microbial growth curve in batch culture. (5)
9. (a) Differentiate between the active and passive transport. (5)
   (b) What are the possible mechanisms of action of anti-microbial drugs? (5)
10. (a) Discuss different types of symbiotic interactions in endomycorrhiza. (5)
    (b) What is the purpose of canning and pasteurization? (5)