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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 pentose sugar, and a phosphate group. Purines and pyrimidines are only types of nitrogenous bases, not the full set of parts.

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