NEET Biology question

Biology Molecular Basis of Inheritance NEET

*E. coli* about to replicate was placed in a medium containing radioactive thymidine for five minutes. Then it was made to replicate in a normal medium. Which of the following observation will be correct?

(A)Both the strands of DNA will be radioactive
(B)One strand radioactiveCorrect
(C)Each strand half radioactive
(D)None is radioactive

Answer: (B)

Solution

During the brief 5-minute pulse in radioactive thymidine, newly synthesised DNA strands incorporate the label; given semi-conservative replication, each new daughter duplex retains

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Question ID VK-111544