Question

What structural problem prevents adenine from pairing with guanine?

A. Each makes two hydrogen bonds.
B. One base makes one hydrogen bond and the other bases makes two hydrogen bonds.
C. Each base makes three hydrogen bonds.
D. One base makes two hydrogen bonds and the other base makes three hydrogen bonds.

Answer 1

The structural problem that prevents adenine from pairing with guanine is that one base makes two hydrogen bonds and the other base makes three hydrogen bonds. Adenine and guanine cannot form a base pair because adenine makes two hydrogen bonds and guanine makes three hydrogen bonds. This structural difference prevents them from forming a base pair.

Step-by-step explanation: