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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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sam9856

Answer:

B

Explanation:

DNA is a double-strandard molecule, while RNA is a single-stranded. DNA and RNA base pairing is slightly different since DNA uses the bases adenine, thymine, cytosine, and guanine; RNA uses adenine, uracil, cytosine, and guanine.Uracil differs from thymine in that it lacks a methyl group on its ring.

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