Multiple Choice
Which of the following pairs of nitrogenous bases correctly represents base pairing in DNA?
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Which pair of nitrogenous bases will form a hydrogen bond in a DNA molecule?
A
Adenine and Thymine
B
Adenine and Cytosine
C
Cytosine and Thymine
D
Guanine and Thymine
Verified step by step guidance1
Recall that DNA is composed of two strands forming a double helix, where nitrogenous bases pair specifically through hydrogen bonds.
Understand that the base pairing rules, known as Chargaff's rules, state that Adenine (A) pairs with Thymine (T), and Guanine (G) pairs with Cytosine (C).
Recognize that Adenine and Thymine form two hydrogen bonds between them, stabilizing the DNA structure.
Note that Guanine and Cytosine form three hydrogen bonds, which is a different pairing than Adenine and Thymine.
Conclude that among the given options, the correct hydrogen bonding pair in DNA is Adenine and Thymine.
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