And these types of nitrogenous bases are known as pyrimidines. So let's look at the arrangement of our nucleotide and how the nucleotides bond to one another. So remember, in a protein we have amino acids that bond to one another via covalent bonds known as dipeptide or peptide bonds. In the case of DNA, the individual subunits known as nucleotides bond to one another via bond, known as a phosphol diaster bond. So let's take a look at the following molecules. So we have one nucleotide and a second nucleotide.