What are two basic differences between dna and rna? more than one right a). rna is usually single stranded, while dna is usually double stranded. b). rna contains uracil, while dna contains thymine. c). rna is usually double stranded, while dna is usually single stranded. d). rna contains thymine, while dna contains uracil. e). rna doesn’t contain cytosine, while dna doesn’t contain adenine.