MHT CET Biology question

In Meselson and Stahl's experiment, DNA extracted from the culture one generation after the transfer from to medium had a hybrid (or intermediate density). Why?

(A)Because the generation time of E.coli (culture) was about 20 minutesCorrect
(B)Because it would take 20 minutes for RNA replication
(C)Because it would take 20 minutes for replication of DNA to RNA (transcription)
(D)Because it would take 20 minutes for translation RNA to protein

Answer: (A)

Solution

E. coli divides about every 20 minutes, so after one generation each DNA molecule has one old () and one new () strand

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Question ID VK-065644