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Sbt 418 Marine Microbiology Question Paper

Sbt 418 Marine Microbiology

Course:Microbiology And Biotechnology

Institution: University Of Nairobi question papers

Exam Year:2010

UNIVERSITY OF NAIROBI
UNIVERSITY EXAMINATIONS 2009/2010
FOURTH YEAR EXAMINATIONS FOR THE DEGREE OF SCIENCE
SBT 418: MARINE MICROBIOLOGY
DATE: 12 FEBRUARY, 2010 TIME: 9.00 A.M. -12.00 NOON
SECTION A: ANSWER ALL QUESTIONS (3 MARKS EACH)
1. With the aid of a well labelled diagram illustrate the profile of the pelagic and benthic ecological zones of a marine ecosystem.
2. In about three sentences describe the salinity of sea water.
3. Define the following:
i. Neuston
ii. Halocline
iii. Biofouling
4. Briefly explain how you would recover the following groups of microorganisms from marine environments :
a. Methanogens
b. Damaged cells
c. Oligotrophic bacteria
5. Bacteria genera are indigenous to the marine environment. Name three genera of bacteria of bacteria that are nitrite oxidizing bacteria.
6. How have marine microorganisms been utilized in biotechnology?
7. How does solubility of CO2 in marine environment influence the survival of marine microorganisms?
8. Distinguish between the taxonomic composition of microorganisms in terms of number on the surface and in the gastro-intestinal tract of marine fish.
9. Illustrate temperature stratification in marine environments.
10. How are microbial numbers on marine plants estimated and what factors influence the populations.
SECTION B ESSAY QUESTIONS
ANSWER ANY 2 QUESTIONS (20 MARKS EACH)
1. Discuss carbon cycling in marine environments.
2. Discuss the benefits and malefits of marine microorganisms.
3. Discuss environmental factors that affect marine microorganisms.
4. Write an essay on the following:
a. Habitats for microorganisms (10 marks)
b. Sampling in marine environments highlighting on samples that can be collected, where they can be collected and equipments utilized. (10 marks)

Sbt 418 Marine Microbiology Question Paper

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