Question

A DNA strand having the sequence C-G-A-T-T-G would be complementary to the sequence:

• A. C-G-A-T-T-G
• B. G-C-T-A-A-C
• C. G-C-T-A-A-G
• D. T-A-G-C-C-T

Answer 1

Answer: (B)

G-C-T-A-A-C

During base pairing, purines always pair up with pyrimidines and vice versa.

So, adenine pairs with thymine using two hydrogen bonds while guanine pairs with cytosine using three hydrogen bonds and vice versa. In the given strand, having sequence C-G-A-T-T-G will have complementary as G-C-T-A-A-C.

So, the correct option is 'G-C-T-A-A-C'.