Multiple Choice
Unlike DNA, RNA contains which nitrogenous base?
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7. DNA and Chromosome Structure
RNA
Multiple Choice
In most organisms, how many polynucleotide strands typically make up an RNA molecule?
A
Two strands (double-stranded)
B
Three strands (triple-stranded)
C
One strand (single-stranded)
D
Four strands (quadruple-stranded)
Verified step by step guidance1
Understand the structure of nucleic acids: DNA is typically double-stranded, while RNA is usually single-stranded.
Recall that RNA molecules consist of a single polynucleotide strand composed of ribonucleotides linked by phosphodiester bonds.
Recognize that although RNA can fold back on itself to form secondary structures (like hairpins), it does not form stable double or multiple strands like DNA.
Therefore, the typical number of polynucleotide strands in an RNA molecule is one, making it single-stranded.
Conclude that the correct answer is 'One strand (single-stranded)' because RNA molecules are generally single-stranded in most organisms.
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