Chargaff's rules state that in any DNA molecule
- A. adenine equals guanine and cytosine equals thymine
- B. the amount of adenine is always greater than that of thymine
- C. the amount of adenine equals thymine and guanine equals cytosine
- D. purines are always more numerous than pyrimidines
Explanation
Because A pairs with T and G pairs with C across the helix, their amounts must match in any double stranded DNA. Pairing A with G instead would ignore the actual hydrogen bonding partners, and purines equal rather than outnumber pyrimidines.
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