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Question

Thymine is held by two hydrogen bonds with the base:

A
guanine
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B
cytosine
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C
thymine
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D
adenine
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Solution

The correct option is D adenine
First we observe that thymine is present in DNA, and not in RNA. The bases present in DNA are adenine, guanine, cytosine and thymine. Out of these, adenine and thymine are complementary and are held with each other through hydrogen bonds. Similar bonds are present between cytosine and guanine. So, D is correct.

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