Nucleic Acids: Types and Properties · Zoology

Chargaff's rule states that in DNA:

Adenine equals Thymine and Guanine equals Cytosine
Adenine equals Guanine and Thymine equals Cytosine
Purines always equal pyrimidines in RNA only
DNA is inherently single-stranded in cells

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Correct answer: Adenine equals Thymine and Guanine equals Cytosine

Chargaff's rules state that in DNA, adenine (A) pairs with thymine (T) and guanine (G) pairs with cytosine (C), so their quantities are always equal. This complementary base pairing supports the double-helix model.

Difficulty: Medium Question 10 of 18

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Chargaff's rule states that in DNA:

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