GROWTH AND NUTRITION OF BACTERIA QUESTIONS

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:

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