Principle of Inheritance and VariationHard

Question

E, coli about to relicate was placed in a medium contining radioactive thymidine for five min utes. Then it was made to replicate in a normal medium. Which of the following observation shall be correct ?

Options

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

Solution

Since DNA replication is semiconservative, the newly synthesized strand of DNA would be normal while the strand obtained from parent molecule would be redioactive.

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