Multiple Choice
DNA differs from RNA in that DNA typically:
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7. DNA and Chromosome Structure
RNA
Multiple Choice
Which of the following is one way that RNA differs from DNA?
A
RNA is usually double-stranded, whereas DNA is usually single-stranded.
B
RNA bases pair using A–C and G–U, whereas DNA uses A–T and G–C.
C
RNA contains uracil (U) instead of thymine (T).
D
RNA contains deoxyribose sugar, whereas DNA contains ribose sugar.
Verified step by step guidance1
Recall the basic structural differences between RNA and DNA molecules, focusing on their sugar components, nitrogenous bases, and strand structure.
Understand that DNA typically has a deoxyribose sugar, while RNA contains a ribose sugar, which has one more oxygen atom than deoxyribose.
Review the nitrogenous bases: DNA uses adenine (A), thymine (T), cytosine (C), and guanine (G), whereas RNA uses adenine (A), uracil (U), cytosine (C), and guanine (G).
Note that RNA is usually single-stranded, while DNA is usually double-stranded, which is the opposite of the first option given.
Recognize that base pairing in DNA is A–T and G–C, while in RNA, uracil (U) replaces thymine (T), pairing with adenine (A), making the statement about A–C and G–U incorrect.
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