GROWTH AND NUTRITION OF BACTERIA QUESTIONS

51.

An organism is completely dependent on atmospheric O2 for growth. This organism is
A.     osmotolerant
B.     acidophile
C.     facultative anaerobe
D.     obligate aerobe
Answer & Explanation

Answer: Option D

Explanation:

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52.

Microaerophilic bacteria are those which require
A.     21 % oxygen for growth
B.     low levels of oxygen for growth (lesser than O2 present in atmosphere)
C.     oxygen for activation of enzymes
D.     none of the above
Answer & Explanation

Answer: Option B

Explanation:

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53.

The period between inoculation of bacteria in a culture medium and beginning of multiplication is known as
A.     stationary phase
B.     log phase
C.     lag phase
D.     decline phase
Answer & Explanation

Answer: Option C

Explanation:

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54.

The term aerotolerant anaerobe refers to an organism that
A.     doesn’t use oxygen but can grow in the presence of oxygen
B.     is killed by oxygen
C.     requires less oxygen than is present in air
D.     prefers to grow without oxygen
Answer & Explanation

Answer: Option A

Explanation:

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55.

The term obligate anaerobe refers to an organism that
A.     doesn’t use oxygen but tolerates it
B.     is killed by oxygen
C.     uses oxygen when present or grows without oxygen when oxygen is absent
D.     prefers to grow without oxygen
Answer & Explanation

Answer: Option B

Explanation:

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