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Question

In E.coli, complete DNA replication requires
38 hours
20 minutes
40 minutes
3 minutes

A

20 minutes

B

3 minutes

C

38 hours

D

40 minutes

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Solution

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The time taken by the bacteria to double in number during a specified time period is known as the generation time. The generation time tends to vary with different organisms. E.coli divides in every 20 minutes, hence its generation time is 20 minutes, The rate of exponential growth of a bacterial culture is expressed as generation time, also the doubling time of the bacterial population. Generation time (G) is defined as the time (t) per generation (n = number of generations). Hence, G=t/n is the equation from which calculations of generation time derive.

So, the correct option is '20 minutes'.

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