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In the DNA double helix, what molecules form the sides of the “ladder” (the backbone)?
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7. DNA and Chromosome Structure
DNA Structure
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Which nitrogenous base is not found in DNA?
A
Uracil
B
Thymine
C
Adenine
D
Guanine
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Recall the four nitrogenous bases found in DNA: Adenine (A), Thymine (T), Cytosine (C), and Guanine (G).
Understand that DNA and RNA differ in one of their nitrogenous bases; DNA contains Thymine, while RNA contains Uracil instead of Thymine.
Identify that Uracil is a nitrogenous base found only in RNA and not in DNA.
Compare the options given: Uracil, Thymine, Adenine, and Guanine, and recognize that Uracil is the base absent from DNA.
Conclude that the nitrogenous base not found in DNA is Uracil.
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