Assume thymine makes up 15% of the bases in a double-stranded DNA molecule. What percentage of the bases in the molecule will be represented by cytosine? Explain your answer.

70% of adenine and thymine make up the segment. This indicates that this section consists of 30% guanine cytosine pairs, 15% of the DNA section will be made up of cytosine bases, this is so because the two bases are equal in terms of quantity.