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Biomolecules question

2022 · 30 Jun · Shift 1 · Q13
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Biomolecules question

2022 · 30 Jun · Shift 1 · Q13

JEE MainChemistryBiomoleculesMCQ+4 / −1
The sugar produced after complete hydrolysis of DNA is
  1. A
    a pentose sugar.
  2. B
    a hexose sugar.
  3. C
    a polysaccharide.
  4. D
    a disaccharide.
View written solutionFree

Correct answer: A

  1. Identify the sugar present in DNA

    DNA stands for Deoxyribonucleic Acid. The sugar unit present in DNA is 2-deoxyribose.

  2. What happens on complete hydrolysis?

    On complete hydrolysis, DNA breaks into its constituent components:

    • nitrogenous bases
    • phosphoric acid
    • sugar

    The sugar obtained is 2-deoxyribose.

  3. Classify 2-deoxyribose

    Deoxyribose has 5 carbon atoms, so it is a pentose sugar.

  4. Check the options

    • A: a pentose sugar — Correct
    • B: a hexose sugar — Incorrect, hexose has 6 carbons
    • C: a polysaccharide — Incorrect, deoxyribose is a monosaccharide
    • D: a disaccharide — Incorrect, deoxyribose is not made of two sugar units

  5. Final answer

    Therefore, the sugar produced after complete hydrolysis of DNA is a pentose sugar.

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