Multiple Choice
In the DNA double helix, what are the “sides” (backbone) of the DNA ladder primarily made of?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In DNA structure, which nitrogenous base does adenine (A) pair with according to Watson-Crick base-pairing rules?
A
Uracil (U)
B
Cytosine (C)
C
Guanine (G)
D
Thymine (T)
Verified step by step guidance1
Recall the Watson-Crick base-pairing rules which describe how nitrogenous bases pair in DNA.
Understand that DNA is composed of four bases: adenine (A), thymine (T), cytosine (C), and guanine (G).
According to these rules, adenine (A) pairs specifically with thymine (T) through two hydrogen bonds.
Note that uracil (U) is found in RNA, not DNA, and pairs with adenine in RNA instead of thymine.
Therefore, in DNA, adenine (A) pairs with thymine (T), not with cytosine (C) or guanine (G).
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