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Biomolecules question

2014 · Shift 0 · Q11
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Biomolecules question

2014 · Shift 0 · Q11

JEE MainChemistryBiomoleculesMCQ+4 / −1
Which one of the following bases is not present in DNA?
  1. A
    Cytosine
  2. B
    Thymine
  3. C
    Quinoline
  4. D
    Adenine
View written solutionFree

Correct answer: C

  1. Recall the nitrogenous bases present in DNA

    DNA contains four nitrogenous bases: Adenine (A), Thymine (T), Cytosine (C), Guanine (G)\text{Adenine (A), Thymine (T), Cytosine (C), Guanine (G)}Adenine (A), Thymine (T), Cytosine (C), Guanine (G)

  2. Check each option

    • A: Cytosine
      Cytosine is a standard base present in DNA.

    • B: Thymine
      Thymine is a standard base present in DNA.

    • C: Quinoline
      Quinoline is not a nitrogenous base of DNA. It is a heterocyclic aromatic compound, but not one of the natural DNA bases.

    • D: Adenine
      Adenine is a standard base present in DNA.

  3. Conclusion

    The base not present in DNA is: Quinoline\boxed{\text{Quinoline}}Quinoline​

  4. Comparison with stored correct answer

    Stored correct answer: C
    Derived answer: C

    Hence, the derived answer agrees with the stored correct answer.

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