Question

14. If 30% of a DNA sample is made up of thymine, T, what percentage of the sample is made up of

cytosine, C?

Answer 1

20%

Step-by-step explanation:

Okay so the phrase apples in trees ( Adenine & Thymine ) and cars in garages (Cytosine & Guanine ) can help in this situation.

Since Thymine is 30%, Adenine will also be 30%. This gives you 60% of the DNA sample.

You have 40% left of the DNA sample so they must be Cytosine and Guanine.

Divide 40% by 2 and you get 20%. So you have 20% Guanine and 20% Cytosine.

Hope it helps!

: )