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Biomolecules question

2006 · Shift 0 · Q18
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Biomolecules question

2006 · Shift 0 · Q18

JEE MainChemistryBiomoleculesMCQ+4 / −1
The pyrimidine bases present in DNA are
  1. A
    cytosine and adenine
  2. B
    cytosine and guanine
  3. C
    cytosine and thymine
  4. D
    cytosine and uracil
View written solutionFree

Correct answer: C

  1. Recall the nitrogenous bases in DNA

    DNA contains four bases:

    • Adenine (A)(A)(A)
    • Guanine (G)(G)(G)
    • Cytosine (C)(C)(C)
    • Thymine (T)(T)(T)

  2. Classify them into purines and pyrimidines

    • Purines (double-ring bases): adenine, guanine
    • Pyrimidines (single-ring bases): cytosine, thymine

  3. Check each option

    • A: cytosine and adenine

      • Cytosine is a pyrimidine, but adenine is a purine.
      • So this is incorrect.

    • B: cytosine and guanine

      • Cytosine is a pyrimidine, but guanine is a purine.
      • So this is incorrect.

    • C: cytosine and thymine

      • Both cytosine and thymine are pyrimidine bases present in DNA.
      • So this is correct.

    • D: cytosine and uracil

      • Uracil is a pyrimidine, but it is present in RNA, not DNA.
      • So this is incorrect.

  4. Final Answer

    The pyrimidine bases present in DNA are cytosine and thymine.

    Therefore, the correct option is C.

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