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Significance of Protein

A eukaryotic ...

Question

A eukaryotic cell is grown in a medium containing radioactive thymine. A gene of 40kb size expresses in the cell. Which of the following molecules will show radioactivity?

A

DNA, RNA, and protein

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B

DNA and RNA

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C

DNA only

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D

DNA, RNA, protein, and lipids

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Solution

The correct option is C DNA only
The nitrogenous bases adenine, thymine, guanine, and cytosine are present in the DNA while RNA contains uracil instead of thymine. Nitrogenous bases are absent in the proteins and lipids. As thymine is present only in the DNA, the radioactivity will appear in the DNA alone.

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