Each of the following statements concerning DNA structure is true EXCEPT which one?
A) [A] + [T] = [G] + [C] in normal double stranded DNA.
B) [A] + [G] = [T] + [C] in normal double stranded DNA.
C) [Purines] = [pyrimidines] in normal double stranded DNA.
D) the specificity of base pairing is due to the arrangement of H-bonds found between bases and the dimensions of the base pairs.
E) the 5 position on thymine bears a methyl group.

Question

Quizplus · Accepted Answer

The correct statement is that in normal double-stranded DNA, the amount of adenine ([A]) equals the amount of thymine ([T]), and the amount of guanine ([G]) equals the amount of cytosine ([C]). This is known as Chargaff's rule. Therefore, [A] + [T] does not equal [G] + [C], but rather [A] = [T] and [G] = [C].

Each of the Following Statements Concerning DNA Structure Is True