Which of these is a difference between a DNA and an RNA molecule?
A. DNA contains nitrogenous bases, whereas RNA contains phosphate groups.
B. DNA is usually double-stranded, whereas RNA is usually single-stranded.
C. DNA is a polymer composed of nucleotides, whereas RNA is a polymer composed of nucleic acids.
D. DNA contains uracil, whereas RNA contains thymine.
E. DNA contains five-carbon sugars, whereas RNA contains six-carbon sugars.
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