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When does S. pneumoniae becomes competent for transformation?

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When does S. pneumoniae becomes competent for transformation?

(a) Lag phase

(b) Log phase

(c) Exponential phase

(d) Stationery phase

I had been asked this question during an online exam.

The query is from Genetic Recombination topic in section Genetic Recombination of Drug Biotechnology

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Best answer
Correct answer is (c) Exponential phase

Best explanation: For transformation to occur every cell has to be competent. Competency is dependent on several conditions. Bacteria need to be on certain stage of growth such as S pneumoniae will be competent only on the exponential phase. When the population will be reaching 107 to 108 cells per ml.

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