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Purines, a heterocyclic compound, such as adenine and guanine are found both in DNA and RNA.

1. Purines are found only in DNA.
2. Purines are found both in DNA and RNA.
3. Purines are found only in RNA.
4. Purines are not found in nucleic acids.

Correct answer: Purines are found both in DNA and RNA.

Solution

Adenine and guanine are purines, and both are standard nitrogenous bases in DNA and RNA. Therefore, purines are present in both nucleic acids, not just one.

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