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In RNA, what is the five-carbon (pentose) sugar found in the nucleotide backbone?
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7. DNA and Chromosome Structure
RNA
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Unlike DNA, RNA contains which of the following nitrogenous bases?
A
Uracil
B
Hypoxanthine
C
5-methylcytosine
D
Thymine
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Recall the four main nitrogenous bases found in DNA: adenine (A), thymine (T), cytosine (C), and guanine (G).
Understand that RNA differs from DNA in one key nitrogenous base: RNA contains uracil (U) instead of thymine (T).
Recognize that uracil pairs with adenine in RNA during base pairing, replacing thymine's role in DNA.
Note that hypoxanthine and 5-methylcytosine are modified bases but are not standard bases distinguishing RNA from DNA.
Conclude that the nitrogenous base unique to RNA, compared to DNA, is uracil.
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