Multiple Choice
Which nucleotide is found in RNA but not in DNA?
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7. DNA and Chromosome Structure
RNA
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Which of the following best describes the typical number of strands found in a molecule of RNA?
A
RNA does not have any strands.
B
RNA is usually double-stranded.
C
RNA is usually single-stranded.
D
RNA always forms a triple-stranded structure.
Verified step by step guidance1
Recall the basic structure of nucleic acids: DNA and RNA are both polymers made of nucleotides, but they differ in strand number and structure.
Understand that DNA typically exists as a double-stranded helix, where two complementary strands pair via base pairing.
Recognize that RNA molecules are usually single-stranded, meaning they consist of only one strand of nucleotides, which allows them to fold into various shapes.
Note that while RNA can form double-stranded regions through intramolecular base pairing, the overall molecule is considered single-stranded.
Conclude that the typical number of strands in an RNA molecule is one, making the statement 'RNA is usually single-stranded' the best description.
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