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Uridine, present only in RNA is a

1. Pyrimidine
2. Nucleoside
3. Nucleotide
4. Purine

Correct answer: Nucleoside

Solution

Uridine consists of a nitrogenous base (uracil) linked to a sugar (ribose), which makes it a nucleoside. A nucleotide would require one or more phosphate groups, and pyrimidine/purine refer only to the base type.

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