1.

In DNA, there are

A. four bases known as adenine, guanine, thymine and cytosine
B. five bases known as adenine, guanine, thymine, tryptophan and cytosine
C. only two bases known as adenine and cytosine
D. three bases known as adenine, guanine and cytosine
Answer» B. five bases known as adenine, guanine, thymine, tryptophan and cytosine


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