which statement about dna and rna is correct? multiple choice dna is single-stranded, and rna is double-stranded. the sugar in dna is ribose, and in rna the sugar is deoxyribose. the base uracil is unique to rna and the base thymine unique to dna. dna is a nucleotide polymer while rna is a carbohydrate polymer. rna has a helix shape; dna does not.