The Purine ______ Always Hydrogen Bonds with the Pyrimidine ______

Question

The purine ______ always hydrogen bonds with the pyrimidine ______ in double-stranded DNA.
A) guanine; cytosine
B) cytosine; guanine
C) adenine; guanine
D) thymine; guanine

Accepted Answer

In double-stranded DNA, the purine guanine (G) always forms hydrogen bonds with the pyrimidine cytosine (C).