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. But in eucalyak acid, these bonds are phosphodia estate bonds and we'll see exactly what these bonds look like in a future lecture. So if we examine, for example, a DNA molecule this is what the DNA molecule actually looks like for DNA. Because of the structure of the sugar and DNA the DNA molecule is able to form a double helix formation.