1.

Pyrimidine bases contain four carbon atoms and purine bases contain 5. How many carbon atoms are there in a nucleotide containing cytosine? (a) 8 (b) 9 (c) 10 (d) 11

Answer»

Correct option is (b) 9

Phosphate group, ribose or deoxyribose group and cytosine group form the nucleotide.

Phosphate (H3PO4)

Ribose (C5H10O5)

Deoxyribose (C5H10O4)

Cytosine has 4 carbon atoms, as it is a pyrimidine. 

Therefore, the nucleotide should have 5C + 4C = 9C



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