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DNA Structure and Replication - Medical Science

Q1:

In DNA, there are

A five bases known as adenine, guanine, thymine, tryptophan and cytosine

B four bases known as adenine, guanine, thymine and cytosine

C three bases known as adenine, guanine and cytosine

D only two bases known as adenine and cytosine

ANS:B - four bases known as adenine, guanine, thymine and cytosine

There are two types of nitrogen bases that are purines and pyrimidine. Purines are adenine and guanine. And pyrimidine are cytosine and thymine.