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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.
There are two basic types of transmembrane proteins: alpha-helical and beta-barrels. Alpha-helical proteins are present in the inner membranes of bacterial cells or the plasma membrane of eukaryotes, and sometimes in the outer membranes. This is the major category of transmembrane proteins. In humans, 27% of all proteins have been estimated to be alpha-helical membrane proteins.