Question

If thymine makes up 19% of the DNA nucleotides in the genome of a plant species, what are the percentages of the other nucleotides in the genome?

Enter your answer in the following order:

a. % of adenine,
b. % of cytosine,
c. % of guanine.

Answer 1

Answer:

a. 19% of adenine

b. 31% of cytosine

c. 31% of guanine

Explanation:

Chargaff's rule states that in a DNa molecule, adenine pairs with thymine and guanine pairs with cytosine.

For that reason, if 19% of the DNA is made up of T, then 19% as well will be made of A.

Then, 19% + 19% = 38% of the genome is comprised of A+T and the other 62% is comprised of G+C.

Since G and C pair with each other, 31% will correspond to G and 31% will correspond to C.