1.
Which of the following is not the characteristic of a growth curve?
A. Shows development of microbial population under relatively stable environmental conditions
B. Plotted with logarithmic numbers
C. Graphs numbers of microbes versus time
D. Each growth curve consists of four distinct phases
Answer & Explanation
Answer: Option D
Explanation:
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2.
Generation time of Escherichia coli is
A. 20 minutes
B. 20 hours
C. 20 days
D. 200 hours
Answer & Explanation
Answer: Option A
Explanation:
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3.
The organism which obtain their energy from chemicals are designated as
A. prototrophs B. chemotrophs
C. organotrophs D. autotrophs
Answer & Explanation
Answer: Option B
Explanation:
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4.
Nutrient content and biological structures are considered as
A. implicit factor for microbial growth
B. intrinsic factor for microbial growth
C. processing factor
D. none of the above
Answer & Explanation
Answer: Option B
Explanation:
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5.
The organism which grows best above 45°C are called
A. psychrophilic
B. mesosphilic
C. thermophilic
D. any of these
Answer & Explanation
Answer: Option C
Explanation:
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