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Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance3 Marks
Question
Why is a DNA molecule considered as a better hereditary material than RNA molecule?
OR
Why is DNA a better genetic material when compared to RNA?
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Answer

DNA is a better genetic material for the following reasons:
  1. The genetic material should be stable and should not change with age or change in physiology; this stability is given to DNA by its.
  1. Double-stranded nature.
  2. Presence of thymine.
  3. The plane of base pair stacking over the other.
  1. Because the 2-OH group of RNA nucleotides is a reactive group, it makes RNA labile and easily degradable; it is absent in DNA.
  2. RNA (23S RNA) is also catalytic, i.e. it is reactive; but DNA is less reactive and more stable.

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