Question
Which is the correct base pairing found in a normal DNA molecule?
NDA
General Ability
General Science
2025
NDA 2025 (Phase 1)
NDA General Ability Question (2025) — Solution
Options
- A. Adenine pairs with Thymine
- B. Adenine pairs with Guanine
- C. Adenine pairs with Cytosine
- D. Thymine pairs with Guanine
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
Related: General Ability — General Science · All PYQ Banks