Q.The pyrimidine bases present in RNA are :

RNA's nitrogenous bases are adenine and guanine (purines) plus cytosine and uracil (pyrimidines) — uracil replaces DNA's thymine in RNA.

Of the five standard nitrogenous bases found in nucleic acids, two are purines (adenine, guanine — common to both DNA and RNA) and three are pyrimidines (cytosine, thymine, uracil). Cytosine is common to both DNA and RNA. The second pyrimidine differs: DNA uses thymine (5-methyluracil), while RNA uses uracil (thymine without the methyl group) in its place. So the pyrimidine bases specifically found in RNA are cytosine and uracil; thymine ( …