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P.T.O.
MAR IVANIOS COLLEGE (AUTONOMOUS)
THIRUVANANTHAPURAM
Reg. No. :.………………… Name :.…………………
First Semester Career Related B.Sc. Degree Examination, November 2016
First Degree Programme under CBCSS Vocational Course (for Botany and Biotechnology)
AUBB151: Microbiology
Common for Regular 2016 Admn. and Improvement 2015 Admn.
Time: 3 Hours Max. Marks 80
SECTION A
Answer ALL the following each in a word or as short notes.
1. Name two nitrifying bacteria.
2. What are thermophiles
3. Expand PDA.
4. What is yogurt
5. The most commonly used solidifying agent for culture media.
6. Name a gaseous sterilant.
7. What is the principle of autoclaving
8. What is antibiosis
9. A bacteria without cell wall.
10. What are auxotrophs
(10 1 10 Marks)
SECTION B
Answer any EIGHT questions, not exceeding one paragraph.
11. How does the class Deuteromycetes differ from the other fungi
12. What are mycoplasmas
13. Differentiate prokaryotes and eukaryotes.
14. What are induced mutations Name two chemical agents causing mutations.
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15. What is SCP Name two organism used for SCP production.
16. Write short note on methanogenic bacteria.
17. What are chemoautotrophs
18. Name any four dairy products and the organism responsible for its production.
19. Write short note on filter sterilization.
20. What is germ theory of disease and what is Pasteur's role in proposing this theory
21. Briefly discuss the importance of bacteria in Sulphur cycle.
22. What are the properties of an ideal antibiotic
2 16 Marks)
SECTION C
Short essay type Answer any SIX questions.
23. Differentiate Gram positive and Gram negative bacteria.
24. Classify bacteria according to their nutritional requirements .
25. How will you check the potency of an antibiotic
26. Briefly explain phosphorous cycle.
27. Explain symbiotic nitrogen fixation.
28. How is energy trapped during the electron transport system
29. What is culture media Differentiate selective and differential media.
30. Briefly describe the strain improvement strategies.
31. What is bacterial growth curve Explain.
4 24 Marks)
SECTION D
Long essay type Answer any TWO questions.
32. Illustrate the lytic and lysogenic cycle of bacteriophage.
33. Discuss the role of microorganisms in Nitrogen cycle.
34. What is pure culture Why are pure cultures of microorganisms required in the laboratory How will you obtain pure culture of bacteria
35. List various physical and chemical agents used to control microbial growth.
15 30 Marks)