AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA MAKES RNA MAKES PROTEIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
According to the base pairing rules for DNA, the percentage of ____
A
adenine > thymine
B
adenine = thymine
C
adenine = guanine
D
cytosine <guanine
Explanation: 

Detailed explanation-1: -Human DNA is 30.9% A and 29.4% T, 19.9% G and 19.8% C. The rule constitutes the basis of base pairs in the DNA double helix: A always pairs with T, and G always pairs with C.

Detailed explanation-2: -In a DNA sample, the percentage of adenine is 40% and percentage of thymine is 60%.

Detailed explanation-3: -The final composition is 22% adenine, 22% thymine, 28% cytosine, and 28% guanine. Uracil is only found in RNA.

Detailed explanation-4: -Thymine (T) makes up 28% of the nucleotides in a sample of DNA from an organism.

Detailed explanation-5: -Therefore, the answer is T = 30%, A = 30%, G = 20% and C = 20%.

There is 1 question to complete.