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Radioactive thymidine when added to the ...

Radioactive thymidine when added to the medium surrounding living mammalian cells gets incorporated into the newly synthesised DNA. Which of the following types of chromatin is expected to become radioactive if cells are exposed radioactive thymidine as soon as they enter the S-phase?

A

Heterochromatin

B

Euchromatin

C

Both (a) and (b)

D

Neither heterochromatin nor euchromatin but only the nucleolus

Text Solution

Verified by Experts

The correct Answer is:
B
In the beginning of S-phase, DNA replication occurs. DNA replication can occur in diffuse/less tightly coiled euchromatin. So active DNA stains light in colour when stained with acetocarmin and feulgen reagent in comparison to heterochromatin.
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