Question

describe the structure of nitrogen bases and position of purine and pyrimidine of DNA​

Answer 1

The commone purines found in DNA and RNA are Adenine and Guanine. Adenine has an amino group on the C6 postion on the ring where as Guanine has an amino group at the C2 position.

The two major pyrimidines found in DNA are Thymine and Cytosine. And in RNA Instead of Thymine ; Uracil is present. Thymine contain methyl group at the C5 position with the carbonyl group at the C4 and C2 position. Cytosine contains a hydrogen atom at the C5 position and an amino group at C4. Uracil is similar to thymine but lacks the methyl group at the C5 position.