36.
Which of the following is the suitable temperature range for mesophiles?
A. 20-30°C
B. 25-40°C
C. >40°C
D. None of these
Answer & Explanation
Answer: Option B
Explanation:
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37.
Exponential phase of growth curve of bacteria is of limited duration because of
A. rise in cell density
B. accumulation of toxic metabolites
C. exhaustion of nutrients
D. all of these
Answer & Explanation
Answer: Option D
Explanation:
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38.
A culture broth tube was very turbid at the bottom of the tube but clear at the top of the tube indicating that the
A. broth is sterile
B. organism can tolerate oxygen
C. organism cannot produce superoxide dismutase and/or catalase
D. organism should be grown in an anaerobic chamber
Answer & Explanation
Answer: Option C
Explanation:
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39.
In the exponential phase, the cells and cell mass
A. first increases then decreases
B. decreases
C. are constant
D. double at a constant rate
Answer & Explanation
Answer: Option D
Explanation:
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40.
What is the primary source of food for marine life?
A. Phytoplankton
B. Zooplankton
C. Sea weed
D. Grass
Answer & Explanation
Answer: Option A
Explanation:
No answer description available for this question.