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Chargaff's Rules

14. DNA Synthesis / Chargaff's Rules / Problem 3

Chargaff’s Rules helped in deducing the double helix structure of DNA. Which statement best summarizes Chargaff’s Rules?

A

The total number of purines in a DNA molecule is always greater than the total number of pyrimidines.

B

The proportion of adenine and thymine varies significantly between different species.

C

The amount of adenine equals the amount of thymine, and the amount of guanine equals the amount of cytosine.

D

DNA consists of a repeating sequence of adenine, thymine, cytosine, and guanine.

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