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Question

One strand of DNA has sequence of nucleotides 3' ATTCGCTAT 5’, then other strand of DNA has

A
3' TAAGCGATA 5’
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B
3' TAGCACGTA 5’
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C
5' TAGCACGTA 3’
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D
5' TAAGCGATA 3’
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Solution

The correct option is D 5' TAAGCGATA 3’

In double stranded DNA, the sequence of nucleotides in one strand is complementary to the sequence of nucleotides on another strand. That is, A pairs with T and G pairs with C.

Also, the two strands of DNA have anti-parallel polarity. It means, if one strand has the polarity 5' →3', the other has 3' → 5'.

So, if one strand of DNA has sequence of nucleotides,
3' ATTCGCTAT 5’, then another strand of DNA has the following sequence of nucleotides: 5’ TAAGCGATA 3’.


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