Multiple Choice
In double-stranded DNA, what is the correct base-pairing rule (Watson–Crick base pairing)?
7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In the context of DNA structure, which nucleotide base is not found in DNA?
A
Uracil
B
Thymine
C
Cytosine
D
Guanine
Verified step by step guidance1
Recall the four main nucleotide bases that make up DNA: Adenine (A), Thymine (T), Cytosine (C), and Guanine (G).
Understand that DNA is a double-stranded molecule where Adenine pairs with Thymine, and Cytosine pairs with Guanine.
Recognize that Uracil (U) is a nucleotide base found in RNA, not DNA.
Note that Uracil replaces Thymine in RNA, pairing with Adenine during RNA transcription.
Conclude that among the options given, Uracil is the nucleotide base not found in DNA.
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