If the sequence of one strand of DNA is written as follows:

5'-ATGCATGCATGCATGCATGCATGCATGC-3'

Write down the sequence of complementary strand in 5' 3' direction.

The sequence of complementary strand in 5' 3' direction will be 5'-GCATGCATGCATGCATGCATGCATGCAT-3'.

Explanation: The two strands of the DNA have opposite polarity. If the sequence of one strand of DNA is 5'-ATGCATGCATGCATGCATGCATGCATGC-3' then the sequence of complementary strand will be 3'-TACGTACGTACGTACGTACGTACGTACG-5'. Therefore, the sequence of complementary strand in 5' 3' direction will be 5'-GCATGCATGCATGCATGCATGCATGCAT-3'.