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UPSC Civil Services (Mains)

Chemistry optional

  • 2 papers
  • 250 marks each
  • 3 h per paper
  • 5 of 8 questions, Q1 and Q5 compulsory

Paper II covers organic chemistry and spectroscopy.

UPSC Civil Services (Mains), Chemistry optional · 2024 · Paper II

Q5(a). Bases of DNA and RNA; stability of DNA and RNA

Question

Write the structures of the bases present in DNA and RNA. Compare the stability of DNA and RNA.

Answer in brief

DNA: A, G, C, T. RNA: A, G, C, U. DNA is the more stable; RNA is hydrolysed easily because of its 2′-OH group.

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Topic notes: biopolymers: proteins, peptides, DNA and RNA, with every Civil Services, IFoS and Geo-Scientist PYQ →

CoversDNA basesRNA basespurines and pyrimidines2′-OHnucleic acid stabilityuracil and thymine

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