Which of the following is true about the differences between the types of nucleic acids? a. rna is typically a double-stranded molecule, whereas dna is always single stranded. b. dna contains the five-carbon sugar deoxyribose, whereas rna contains the five-carbon sugar ribose. c. dna can contain the nitrogenous base uracil, whereas rna can contain the nitrogenous base thymine. d. rna contains genetic information, whereas dna is involved in the direct production of proteins.