question_answer

The nucleic acid base having two possible binding sites is:

A) thymine              

B)        cytosine              

C)        guanine               

D)        adenine

Correct Answer: D

Solution :

Thymine (pyramidine base) and adenine (purine base) attach to each other by two H?bonds while cytosine (pyrimidine) and guanine (purine) attach by three H-bonds.