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JEE Main · 2004 · 24 Apr 2004 · Offline · Biomolecules

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Which base is present in RNA but not in DNA?
  1. (A)Uracil✓ Correct
  2. (B)Thymine
  3. (C)Guanine
  4. (D)Cytosine

Answer: (A)

Solution

RNA and DNA share adenine, guanine and cytosine, but differ in the fourth base: RNA uses uracil where DNA uses thymine. So uracil is the base found in RNA and not in DNA, taking thymine's place and pairing with adenine.

JEE Main · 2004 · 24 Apr 2004 · Offline · Single correct option

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