Question

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

• A. 3' TAGCACGTA 5’
• B. 5' TAGCACGTA 3’
• C. 3' TAAGCGATA 5’
• D. 5' TAAGCGATA 3’

Answer 1

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’.