Question

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how are dna and rna different?
rna contains adenine, cytosine, thymine and guanine whereas dna contains adenine, cytosine, thymine and uracil.
rna is much smaller. dna, by contrast, averages more than 100 million base pairs long.
rna contains a sugar called ribose whereas dna contains a sugar called deoxyribose.
rna consists of only one nucleotide chain whereas dna is a double helix.

Explanation:

Answer:

RNA is much smaller. DNA, by contrast, averages more than 100 million base pairs long.
RNA contains a sugar called ribose whereas DNA contains a sugar called deoxyribose.
RNA consists of only one nucleotide chain whereas DNA is a double helix.