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Question

How many hydrogen bonds are present in a DNA duplex, if one chain of DNA has sequence ATTAGC?

A
12
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B
10
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C
14
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D
16
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Solution

The correct option is C 14
There are two hydrogen bonds between an adenine and thymine and three hydrogen bonds between a guanine and cytosine.

For ATTAGC its complementary strand would be TAATCG and there would be a total of 14 hydrogen bonds between the strands.

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