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Chargaff's rule states that in an organism

1. Amounts of all bases are equal
2. Amount of adenine (A) is equal to that of thymine (T) and the amount of guanine (G) is equal to that of cytosine (C)
3. Amount of adenine (A) is equal to that of guanine (G) and the amount of thymine (T) is equal to that of cytosine (C)
4. Amount of adenine (A) is equal to that of cytosine (C) and the amount of thymine (T) is equal to that of guanine (G)

Correct answer: Amount of adenine (A) is equal to that of thymine (T) and the amount of guanine (G) is equal to that of cytosine (C)

Solution

Chargaff's rule states that in DNA, the amount of adenine (A) equals thymine (T), and the amount of guanine (G) equals cytosine (C), due to base pairing. This is a fundamental principle of DNA structure.

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