Question

if a dna sample were composed of 20% guanine, what would be the percentage of cytosine?
o 20
o 30
o 40
o 60

Explanation:

Step1: Recall base - pairing rule

In DNA, guanine (G) pairs with cytosine (C). So the amount of G equals the amount of C.

Step2: Determine cytosine percentage

If G is 20%, then C is also 20% because of the G - C base - pairing.

Answer:

20