Multiple Choice
In the context of DNA structure, which set correctly lists the three components of a DNA nucleotide?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In DNA structure, which nitrogenous base forms complementary base pairs with thymine (T) via hydrogen bonds?
A
Adenine (A)
B
Uracil (U)
C
Guanine (G)
D
Cytosine (C)
Verified step by step guidance1
Recall that DNA is composed of four nitrogenous bases: adenine (A), thymine (T), guanine (G), and cytosine (C).
Understand that base pairing in DNA follows Chargaff's rules, where adenine pairs with thymine, and guanine pairs with cytosine.
Recognize that adenine and thymine form complementary base pairs through two hydrogen bonds, which stabilizes the DNA double helix.
Note that uracil (U) is found in RNA, not DNA, and pairs with adenine instead of thymine.
Conclude that the nitrogenous base that pairs with thymine (T) in DNA is adenine (A).
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