Anaerobes can exist as eukaryotes or as prokaryotes, but they are never multicellular.
Do the same for the most common covalent bond contributing to three-dimentional protein structure. Name the various types of chemical bonds involved in protein synthesis and assembly. State whether each is covalent or non-covalent, and for each, state the level of structure at which its role is particularly important or relevant. Name three characteristics typical of enzyme active sites. Make an educated guess about the molecular structure of an enzyme active site with a pH optimum of 4.5.