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DNA synthesis can be specifically measured by estimating the incorporation of radio labelled

1. uracil
2. adenine
3. thymidine
4. deoxyribose sugar

Correct answer: thymidine

Solution

Thymidine is a DNA-specific nucleoside, so radioactive thymidine is incorporated into newly synthesized DNA and directly reflects DNA synthesis. Uracil is used in RNA, while adenine and deoxyribose are not as specific for measuring DNA replication.

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