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NDA 2025
Exam
NDA
Year
2025
Subject
General Ability
Chapter
General Science

NDA 2025 · General Ability · General Science

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

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

Options

  1. AAdenine pairs with Thymine
  2. BAdenine pairs with Guanine
  3. CAdenine pairs with Cytosine
  4. DThymine pairs with Guanine

Correct answer

A. Adenine pairs with Thymine

Step-by-step solution

In a normal DNA molecule, according to Chargaff's rules and the Watson-Crick model, purines pair with pyrimidines.

Adenine (A) pairs with Thymine (T) through two hydrogen bonds.

Guanine (G) pairs with Cytosine (C) through three hydrogen bonds.

Answer: Adenine pairs with Thymine
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