And these two molecules essentially are linear polymers of these subunits we call nucleotides. And a nucleotide consists of three components. So we have a nitrogenous base, we have a sugar molecule and we have a phosphate group. And just like in a protein, we have the linear polymer of amino acids. In nucleic acids, we have a linear polymer of nucleotides. Now, in proteins, the bonds connecting the amino acids are peptide bonds.