Question

A DNA fragment has 3000 nucleotides, out of which 160 are Guanine. How many bases having double hydrogen bonds between them does this DNA fragment possess?

• A. 160
• B. 320
• C. 1340
• D. 2680

Hint:

Remember that A-T forms two hydrogen bonds, while G-C forms three hydrogen bonds.

Answer 1

The Correct Option is D

- DNA bases forming double hydrogen bonds are Adenine (A) and Thymine (T).
- Bases forming triple hydrogen bonds are Guanine (G) and Cytosine (C).
Given:
- Total nucleotides = 3000.
- Guanine (G) count = 160.
- Cytosine (C) count = 160 (G pairs with C).
- Therefore, A + T = Total nucleotides - (G + C) = 3000 - (160 + 160) = 2680.