AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA MAKES RNA MAKES PROTEIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
If a sample of DNA contains 20% Adenine, how much Guanine is present?
A
20%
B
30%
C
60%
D
80%
Explanation: 

Detailed explanation-1: -Since adenine is 20%, then thymine is 20% as well. The total of both is 40%. From 100 remains 60% which is divided equally between guanine and cytosine, so each is 30%.

Detailed explanation-2: -Since cytosine and guanine are always present in equal numbers, the percentage of guanine molecule is 30%.

Detailed explanation-3: -The percentage of guanine is 20%.

Detailed explanation-4: -It means the amount of guanine will be equal to cytosine and the amount of adenine will be equal to thymine. In the given problem, adenine is 20%. Hence, thymine will be 20%. So the percentage of cytosine and guanine will be 30% each.

Detailed explanation-5: -Adenine (30%) = Thymine (30%) Guanine (20%) = Cytosine (20%) Therefore, 60% A-T and 40% C-G.

There is 1 question to complete.