Even though proteins are considered macromolecules ... their primary structure. These stretches have been conserved through evolution and are vital to the catalytic function of the protein.

and the protein function is directly related to the resulting 3D structure. Proteins may also interact with each other or other macromolecules in the body to create complex assemblies. In these ...

They are the workhorse macromolecules ... as the functions they serve. Proteins can be big or small, mostly hydrophilic or mostly hydrophobic, exist alone or as part of a multi-unit structure ...