And so the amino acids found on this beta pleated sheet interact with amino acids found on this beta pleated sheet. And so these bonds are part of the tertiary structure of our polypeptide. So let's suppose for argument's sake that initially by increasing the temperature, we destabilize this segment of our DNA. So initially we begin to break down these bonds, these non covalent interactions, so that eventually we go from the native state to intermediate state A, where all of these bonds are essentially broken down. Now, in the process, by breaking down these bonds here, we change the shape of our molecule and we cause other bonds to begin to break as well. So other segments of that protein molecule begin to break down as well.