CBSE 2023 · Region 5 · Set 3 · Q15 · 1 mark
Assertion (A) : The backbone of DNA and RNA molecules is a chain consisting of heterocyclic base, pentose sugar and phosphate group.
Reason (R) : Nucleotides and nucleosides mainly differ from each other in presence of phosphate group.
Official answer
From CBSE’s own marking scheme for this paper.
(B)
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
BiomoleculesNucleic AcidsUnderstandassertion_reasoneasy
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CBSE Class 12 Chemistry past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.