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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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