Why does cytosine make pair with guanine and not with adenine?

Question

Why does cytosine make pair with guanine and not with adenine? (A) Polar nature of C and A (B) C—A pair would not reach across the double helix (C) C—A pair would be wider than double (D) Hydrogen bond forming functional groups are not complementary between C and A

Tardigrade Admin · Accepted Answer

Cytosine make pair with guanine and not with adenine because hydrogen bond forming functional groups are not complementary between C and A.

Q. Why does cytosine make pair with guanine and not with adenine?

Polar nature of C and A

C—A pair would not reach across the double helix

C—A pair would be wider than double

Hydrogen bond forming functional groups are not complementary between C and A

Cytosine make pair with guanine and not with adenine because hydrogen bond forming functional groups are not complementary between C and A.