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1 Antibodies-Antibodies are used to defend the body against foreign agents e.g. bacteria, fungi and viruses. 2  The next page investigates these. 3  4. Structural Protein-Globular proteins form part of the cell membrane, which has a structural role as well as a role in transporting ions in and out the cell.
A single protein molecule may contain one or more of the protein structure types. 1  Primary Structure - describes the unique order in which amino acids are linked together to form a protein. 2  Secondary Structure - refers to the coiling or folding of a polypeptide chain that gives the protein its 3-D shape. There are two types of secondary structures observed in proteins. One type is the alpha (Î±) helix structure. This structure resembles a coiled spring and is secured by hydrogen bonding in the polypeptide chain.