Multiple choice

DNA having labelled thymidine is allowed to replicate in medium having non-radioactive thymidine. After 3 replications, the number of DNA molecules having labelled thymidine shall be

  1. one

  2. two

  3. four

  4. eight

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Initially we have 2 strands with radioactive thymidine. Going by the concept of replication and the statement provided that the replications were carried out in non-radioactive medium, there would be 2 molecules of DNA having radioactive thymidine.

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