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Biomolecules question

2004 · Shift 0 · Q19
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Biomolecules question

2004 · Shift 0 · Q19

JEE MainChemistryBiomoleculesMCQ+4 / −1
Which base is present in RNA but not in DNA?
  1. A
    Uracil
  2. B
    Thymine
  3. C
    Guanine
  4. D
    Cytosine
View written solutionFree

Correct answer: A

  1. Recall the nitrogenous bases in DNA and RNA

    • DNA contains the bases: Adenine (A)(A)(A), Thymine (T)(T)(T), Guanine (G)(G)(G), and Cytosine (C)(C)(C).
    • RNA contains the bases: Adenine (A)(A)(A), Uracil (U)(U)(U), Guanine (G)(G)(G), and Cytosine (C)(C)(C).

  2. Identify the base present in RNA but not in DNA

    Comparing the two sets:

    • Common bases: Adenine, Guanine, Cytosine
    • Different bases:
      • DNA has Thymine
      • RNA has Uracil

    Therefore, the base present in RNA but not in DNA is Uracil.

  3. Evaluate the options

    • A: Uracil — Correct
    • B: Thymine — Present in DNA, not RNA
    • C: Guanine — Present in both DNA and RNA
    • D: Cytosine — Present in both DNA and RNA

  4. Final Answer

    The correct option is A: Uracil.

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