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Guanine is an example of:

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

Correct answer: Purine base

Solution

Guanine is one of the two purine nitrogenous bases found in nucleic acids. It is not a nucleotide or nucleoside because it lacks sugar and phosphate, and it is not a pyrimidine because it has a fused double-ring structure.

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