Question

Which of the following are pyrimidine?

A. Guanine and cytosine
B. Thymine and Guanine
C. Cytosine and uracil
D. Guanine and adenine
E. Adenine and thymine​

Answer 1

c.Cytosine and uracil

Step-by-step explanation:

Two types of Nitrogenous bases(heterocyclic aromatic molecules) are found in DNA and RNA: 1.Pyrimidines and 2.Purines

Pyrimidines:Thymine(5-methyl-2,4-dioxypyrimidine) and Cytosine(2-oxy-4-aminopyrimidine) are found in DNA . Uracil (2,4-dioxypyrimidine) and Cytosine (2-oxy-4-aminopyrimidine) are found in RNA.

Purines:Adenine (6-aminopurine) and Guanine(6-oxy-2-aminopurine) are the two purine bases that are found in both DNA and RNA.