A) A = U and G = C in any molecule of RNA. B) A = G and C = T in any molecule of DNA. C) A = C and G = T in any molecule of DNA. D) A = T and G = C in any molecule of DNA. E) DNA and RNA are made up of the same four nitrogenous bases.
The two polynucleotide chains in a DNA molecule are attached to each other by
A) peptide bonds between amino acids. B) hydrogen bonds between bases. C) ionic bonds between "R" groups in amino acids. D) covalent bonds between phosphates and sugars. E) covalent bonds between carbon atoms.