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In both DNA and RNA, heterocyclic base and phosphate ester linkages are at –

1. C5' and C1' respectively of the sugar molecule
2. C1' and C5' respectively of the sugar molecule
3. C2' and C5' respectively of the sugar molecule
4. C5' and C2' respectively of the sugar molecule

Correct answer: C1' and C5' respectively of the sugar molecule

Solution

The correct option is right because in both DNA and RNA, the heterocyclic base is attached to the C1' carbon of the sugar, while the phosphate group is linked to the C5' carbon, establishing the backbone structure of nucleic acids.

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