Question

Thymine makes up 32% of the nucleotides in a sample of DNA. What percentage of nucleotides is guanine?

16%

18%

32%

36%

Answer 1

18 %

T= A = 32%

G= C =x

So :-

T+A+G+ C = 100%

32+32+x+x = 100%

64+2x=100%

2x=100-64

2x = 36

x= 18%