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DNA and RNA are polymers composed of repeating monomers called:
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7. DNA and Chromosome Structure
DNA Structure
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In nucleic acids, which nitrogenous base is found only in DNA (and not in RNA)?
A
Uracil
B
Thymine
C
Adenine
D
Cytosine
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Recall that nucleic acids include DNA and RNA, each composed of nitrogenous bases paired with a sugar-phosphate backbone.
Identify the four main nitrogenous bases in DNA: Adenine (A), Thymine (T), Cytosine (C), and Guanine (G).
Identify the four main nitrogenous bases in RNA: Adenine (A), Uracil (U), Cytosine (C), and Guanine (G).
Compare the bases in DNA and RNA to find which base is unique to DNA and not found in RNA.
Conclude that Thymine is the nitrogenous base found only in DNA, while Uracil replaces Thymine in RNA.
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