(E). coli about to replicate was placed in a medium containi... | Biology | SolveeIt | Solveeit

Today, August 18

Question

$E$ . coli about to replicate was placed in a medium containing radioactive thynidine 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 radioactive

C

Each strand half radioactive

D

None is ladioactive

Answer

One strand radioactive

Explanation

Solution

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