Question

The percentage of cytosine in a bacterial genome was determined to be 20 %. What is the percent of adenine?

a) 10
b) 20
c) 30
d) 40
e) cannot be determined from the information given

Answer 1

In a bacterial genome with 20% cytosine, the percentage of adenine would be 30%.

Step-by-step explanation:

In DNA, cytosine and guanine always pair with each other, while adenine and thymine pair together. This is known as Chargaff's rules.

If the percentage of cytosine in a bacterial genome is 20%, then the percentage of guanine will also be 20%. Therefore, the percentage of adenine will be 30%, because in DNA, adenine and thymine are always equal in percentage.

So, the correct answer is C) 30%.