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′
• B. 3′ ACTAGTA 5′
• C. 3′ ATGATCA 5′
• D. 3′ GACGTCG 5′

Answer 1

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: