Question

If a section of DNA has 27 percent thymine, how much cytosine will it have?

Answer 1

23%

Explanation:

DNA is composed of nucleotides - information carrying blocks. The body interprets the information blocks in order to produce proteins and other structures of and for the body.

There are 4 nucleotides, and for simplicity sake I'll abbreviate them to single letters: G, C, A, and T (the link below has all this and much much more). Now here's the thing - wherever a G is, there is a C that connects to it. Where there's a C, there is a G. And the same is true for A and T.

The question asks that if there is 27% T in a section of DNA, how much C is there?

If there is 27% T, there is also 27% A (because they are a pair) - and that adds up to 54%. So the remaining 46% is composed of G and C, or 23% each.