Purines |
Pyrmidines |
(1) Its molecules is double ringed. (2) It is a nine membered ring. (3) Its molecule is larger. (5) For eg. Adenine and guanine. |
(1) Its molecule is single ringed. (2) It is six membered ring. (3) lIts molecule is smaller. (4) For e.g Thymine and cytosine. |