Growth and Nutrition of Bacteria – Section 1

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

Correct Answer: D. Each growth curve consists of four distinct phases

2. Generation time of Escherichia coli is

A. 20 minutes
B. 20 hours
C. 20 days
D. 200 hours

Correct Answer: A. 20 minutes

3. The organism which obtains their energy from chemicals are designated as

A. prototrophs
B. chemotrophs
C. organotrophs
D. autotrophs

Correct Answer: B. chemotrophs

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

Correct Answer: B. intrinsic factor for microbial growth

5. The organism which grows best above 45°C are called

A. psychrophilic
B. mesophilic
C. thermophilic
D. any of these

Correct Answer: C. thermophilic

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