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Question

If the base sequence in one strand of double stranded DNA is 3′ TGATCAT 5′, then the base sequence of its complementary strand would be
[0.7 mark]

A
3′ TACTAGT 5′
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B
3′ ACTAGTA 5′
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C
3′ ATGATCA 5′
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D
3′ GACGTCG 5′
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Solution

The correct option is C 3′ ATGATCA 5′
In DNA, adenine forms two hydrogen bonds with thymine and cytosine forms three hydrogen bonds with guanine. Therefore, the complementary strand will be as follows:


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