Question

Cytosine makes up 42% of the nucleotides in a sample of dna from an organism. approximately what percentage of the nucleotides in this sample will be thymine? a 8% b 31% c 42% d 16%

Answer 1

a) 8% - because cytosine pairs with guanine so they have the same percentage and that makes it up to 84%. Adenine and Guanine also occur in the same percentages are they pair so 100-84 leaves 16% remaining, divided by 2 leaves 8% for both cytosine and guanine.