chapter 12 dna rna section review 3 answer key
le helix composed of two strands of nucleotides, each containing a sugar (deoxyribose), a phosphate group, and a nitrogenous base. - RNA is typically single- stranded, with a sugar (ribose), phosphate group, and nitrogenous bases. - The bases include adenine (A), thymine (T) in DNA, urac