In the given options identify purines and pyrimidines and choose the correct option
I. Adenine II. Guanine III. Cytosine IV. Uracil
V. Phosphate VI. Sugar VII. Thymine Pyrimidines Purines

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. II, III and V IV, V and VI

III, IV and VII I and II

I and II III,IV and V

I, II and III IV and VII

answer is B.

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Detailed Solution

Purines are nine membered dicyclic or double ring nitrogen bases where the two rings are joined at 4 & 5 positions. Nitrogen occurs at 1.3,7 and 9 . purines are of two types they are adenine and guanine. Pyramidines are 6-membred, monocyclic or single ring nitrogen bases. They have nitrogen at 1 and 3 positions. Pyramidines are of three types Cytosine, Thymine and Uracil.

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