Question

A sequence of DNA has 300 nitrogenous base pairs, of which 75 are Guanine.

What is the number of Thymine in this sequence?

Options

• 150

• 100

• 50

• 75

Answer 1

75

Explanation:

Given:

Total base pairs = 300

Guanine (G) = 75 → Cytosine (C) = 75

So, remaining base pairs = 300 − (75 + 75) = 150 → these are Adenine-Thymine pairs.

Since A = T, the number of Thymine (T) = `150/2` = 75.