Multiple Choice
Which of the following is found on RNA but not DNA?
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7. DNA and Chromosome Structure
RNA
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Which base is found only in RNA and not in DNA?
A
Deoxyribose
B
Uracil
C
Ribose
D
Thymine
Verified step by step guidance1
Understand the basic components of nucleic acids: DNA and RNA are both made up of nucleotides, which consist of a sugar, a phosphate group, and a nitrogenous base.
Recall the sugars present in DNA and RNA: DNA contains deoxyribose sugar, while RNA contains ribose sugar. This difference is important but does not directly answer the question about bases.
Identify the nitrogenous bases in DNA: DNA contains adenine (A), thymine (T), cytosine (C), and guanine (G).
Identify the nitrogenous bases in RNA: RNA contains adenine (A), uracil (U), cytosine (C), and guanine (G). Notice that RNA has uracil instead of thymine.
Conclude that the base found only in RNA and not in DNA is uracil, because thymine is replaced by uracil in RNA.
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