Question

Which of the following N${}_2$ bases are pyrimidines?

• A. T and C
• B. T and A
• C. A and C
• D. G and T

Answer 1

The correct option is A T and C

In nucleic acids, three types of nucleobases are pyrimidine derivatives: cytosine (C), thymine (T), and uracil (U). Purines and pyrimidines make up the two groups of nitrogenous bases, including the two groups of nucleotide bases. Two of the four deoxyribonucleotides and two of the four ribonucleotides, the respective building-blocks of deoxyribonucleic acid - DNA, and ribonucleic acid - RNA, are purines. Two of the five bases in nucleic acids, adenine and guanine, are purines. In DNA, these bases form hydrogen bonds with their complementary pyrimidines thymine and cytosine, respectively. This is called complementary base pairing.