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Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance1 Mark
MCQ
Identify the group which contains only pyrimidines.
  • A
    Adenine, cytosine
  • B
    Uracil, cytosine
  • C
    Guanine, uracil and cytosine
  • D
    Adenine, guanine
✓

Answer

  1. Uracil, cytosine

Explanation:

DNA and RNA both have four bases, that includes two purines and two pyrimidines, in the nucleotide chains. There are two purines namely adenine and guanine and three pyrimidines namely cytosine, thymine and uracil. The purines adenine and guanine and the pyrimidine cytosine are common to both DNA and RNA. DNA has the pyrimidine thymine; RNA has the pyrimidine uracil.

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