Question

a dna molecule containing 32% thymine would contain how much cytosine? multiple choice 64% 36% 18% 32%

Explanation:

Step1: Recall base - pairing rules

In DNA, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). So, the amount of A = T and the amount of C = G.

Step2: Calculate the amount of A

Given that T = 32%, then A = 32% because A = T.

Step3: Calculate the combined amount of A and T

A + T=32% + 32% = 64%.

Step4: Calculate the combined amount of C and G

The total amount of bases in DNA is 100%. So, C + G=100%-(A + T)=100% - 64% = 36%.

Step5: Calculate the amount of C

Since C = G, then C=\frac{36\%}{2}=18%.

Answer:

18%