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A nucleotide is formed of

1. purine, pyrimidine and phosphate
2. purine, sugar and phosphate
3. nitrogen base, sugar and phosphate
4. pyrimidine, sugar and phosphate

Correct answer: nitrogen base, sugar and phosphate

Solution

A nucleotide always contains three components: a nitrogenous base, a sugar, and a phosphate group. Purines and pyrimidines are types of nitrogenous bases, so they are not the full set of parts by themselves.

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