Which of the following is true for the protein structure of an E. Coli sample? All right. So if we take a look here, we can see that in this E. Coli sample, we have what we have 3 tertiary structures.
Right? So, we have 3 different peptide chains all coalescing, all coming together to form this structure. Now, because we have 2 or more subunits, each one of them representing a subunit, we know that we have a quaternary structure. All of them are saying that, but there are 3 of them, so that would mean that it is a trimeric structure. If we look at our options, it's not dimeric, so that's out.
Not tetrameric because it's not 4, it's 3. Not monomeric, it's not 1. It would be because here, it's a quaternary structure which is trimeric because it's 3 tertiary structure chains or 3 subunits, and they're held together by non-covalent bonds. That is true. In this case, they're not covalently bonded to each other.
They're connected to each other through non-covalent means. So here, option would be the best choice. It's quaternary, yes, and it's the only one that says trimeric.
