Multiple Choice
DNA is constructed of which of the following components?
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7. DNA and Chromosome Structure
DNA Structure
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In DNA's structure, adenine always pairs with which of the following bases?
A
Cytosine
B
Guanine
C
Uracil
D
Thymine
Verified step by step guidance1
Recall the base pairing rules in DNA, which are based on complementary hydrogen bonding between nitrogenous bases.
Identify that DNA is composed of four bases: adenine (A), thymine (T), cytosine (C), and guanine (G).
Understand that adenine pairs specifically with thymine in DNA, forming two hydrogen bonds.
Note that cytosine pairs with guanine, and uracil is found only in RNA, replacing thymine.
Conclude that adenine always pairs with thymine in the DNA double helix structure.
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