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Chemistry · 2023 · 2 marks
CBSE 2023 · Region 2 · Set 2 · Q23
(a) What is the difference between a nucleoside and nucleotide? 2 × 1 (b) What products would be formed when a nucleotide from DNA containing thymine…
(a)
What is the difference between a nucleoside and nucleotide? $\displaystyle \mathbf{2} \boldsymbol{\times} \mathbf{1}$
(b)
What products would be formed when a nucleotide from DNA containing thymine is hydrolysed?
Marking-scheme solution
(a) Nucleoside ⟶ Nitrogenous base + Sugar whereas
Nucleotide ⟶ Nitrogenous base + Sugar + Phosphate group.
(b) Thymine base, $\displaystyle 2$-Deoxyribose sugar, and a Phosphoric acid.
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CBSE Class 12 Chemistry past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.