# Answer to Question #164957 in Molecular Biology for Aliya

Question #164957

in a dna strand if 40% of the nucleotides are guanine what percent are thymine?

A). 20%

B). 10%

C). 30%

D). 40%

100%-40%=60%/2=30%

is this correct? If it isn't please walk me through it as I have a test tomorrow. Thank you.

1
2021-02-19T09:21:51-0500

In a dna strand if 40% of the nucleotides are guanine what percent are thymine?

A). 20%

B). 10%

C). 30%

D). 40%

100%-40%=60%/2=30%

Is this correct? If it isn't please walk me through it as I have a test tomorrow. Thank you.

Solution:

The number of T is equal to the number of A, the number of G is equal to the number of C.

If the question is about single stranded DNA it`s impossible to consider the number of other nucleotides. But if the question is about double stranded DNA, the answer would be:

(100% - 2*40%)/2 = 10%

The percent of thymine in double stranded DNA is 10%.

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