Chemistry NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 3 PCB Single Correct MCQ
Published on: August 11, 2026

While conducting an experiment, an E. coli was placed in a medium containing radioactive thymidine for some time to replicate. Then it is again allowed to replicate, but in a normal medium. Among the given options which will be the correct observation?

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

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The correct answer is:
C

When the E. coli is placed in a medium containing radioactive thymidine for the process of replication, it results in the two strands of DNA containing radioactive thymidine’s. Consequently it is placed in normal medium and allowed to replicate again, it results in one strand being radioactive. This is because the DNA replication is semi-conservative.

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