Two nucleic acids are linked together by which of the following?
a. Covalent bonds between amino and carboxyl groups known as peptide bonds
b. Covalent phosphodiester bonds between the phosphate of one nucleotide and the hydroxyl group on the sugar of another nucleotide
c. Condensation reactions releasing water link two carboxyl groups.
d. None of these
e. Hydrogen bonding of the chains between the nucleotides.