Question

organic, biological, and nuclear chemistry
dna and rna have base pairs that form hydrogen bonds with complementary bases. the dna molecule shown contains adenine, cytosine, guanine, and thymine. which base does rna not have?
a) cytosine
b) thymine
c) adenine
d) guanine

Explanation:

To determine which base RNA does not have, we recall the nucleotide bases of DNA and RNA. DNA has adenine (A), cytosine (C), guanine (G), and thymine (T). RNA has adenine (A), cytosine (C), guanine (G), and uracil (U) instead of thymine (T). So RNA does not contain thymine.

Answer:

B) Thymine