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NDA 1 2025 GAT, question 110

Topic: Biology

Q110

Which is the correct base pairing found in a normal DNA molecule ?

  1. (a) Adenine pairs with ThymineCorrect answer
  2. (b) Adenine pairs with Guanine
  3. (c) Adenine pairs with Cytosine
  4. (d) Thymine pairs with Guanine

Solution.

Answer: (a) Adenine pairs with Thymine

  1. In normal double-stranded DNA, adenine pairs with thymine and guanine pairs with cytosine.
  2. Each pair combines a purine with a pyrimidine, helping maintain the uniform width of the double helix.