Multiple Choice
In the context of DNA structure, what are the monomers (repeating subunits) that make up a DNA polymer called?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In DNA structure, which nitrogenous base is NOT found in DNA?
A
Cytosine
B
Uracil
C
Adenine
D
Thymine
Verified step by step guidance1
Recall the four nitrogenous bases that make up DNA: Adenine (A), Thymine (T), Cytosine (C), and Guanine (G).
Understand that DNA is composed of a double helix structure where these bases pair specifically: Adenine pairs with Thymine, and Cytosine pairs with Guanine.
Recognize that Uracil (U) is a nitrogenous base found in RNA, not DNA. In RNA, Uracil replaces Thymine and pairs with Adenine.
Therefore, identify that among the options given, Uracil is the base that is NOT found in DNA.
Summarize that DNA contains Cytosine, Adenine, and Thymine, but Uracil is exclusive to RNA.
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