2
lesson pretestMultiple Choice

Pretest

Question 2 • CMS 2026-2027 Biology CREDIT RECOVERY

According to Chargaff's rule, base pairing in DNA should resemble which of these?

Answer
A
cap A is equal to cap u ; cap c is equal to cap g
B
cap A is equal to cap c ; cap t is equal to cap g
C
cap A is equal to cap g ; cap t is equal to cap u
D
cap A is equal to cap t ; cap c is equal to cap g

Explanation

Chargaff’s rule states that in DNA, the amount of adenine (A) equals thymine (T), and the amount of cytosine (C) equals guanine (G). This happens because A pairs with T, while C pairs with G. Therefore, the correct choice is D: A is equal to T and C is equal to G.

AI-written and checked against the verified answer.

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