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Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance1 Mark
MCQ
The two strands of DNA are held together by.
  • A
    Peptide bonds.
  • B
    Phosphodiester bonds.
  • C
    Hydrogen bonds.
  • D
    S-S bonds.
✓

Answer

  1. Hydrogen bonds.

Explanation:

The nitrogenous bases present in the DNA are purines and pyrimidines. Purines are double ring while pyrimidines are single ring structure. Adenine and guanine are purines while thymine, uracil, and cytosine are pyrimidines. A purine is attached to pyrimidine by hydrogen bond. Adenine is attached to thymine by two hydrogen bonds while three hydrogen bond is present between guanine and cytosine.

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