Their Structure and Function
The polymers of proteins are polypeptides.
Protein's Functional Group
The functional group of proteins is the amine group.
Proteins are mainly used to transport, hold things together, and break down molecules for energy. The structure of proteins greatly affect its function. Collagen, a structural protein, are long and stringy and that allows them to act as glue for other molecules. Hemoglobin, a transport protein, has a sort of blob shape that allows it to carry molecules throughout the body. The small dot like shape of enzymes like amylase allows them to move around and perform tasks rapidly.