0934105015.png - Enzymatic proteins Function Selective acceleration of chemical reactions Example Digestive enzymes catalyze the hydrolysis of bonds in

0934105015.png - Enzymatic proteins Function Selective...

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Unformatted text preview: Enzymatic proteins Function: Selective acceleration of chemical reactions Example: Digestive enzymes catalyze the hydrolysis of bonds in food molecules. .‘ ' fl Defensive proteins Function: Protection against disease Example: Antibodies inactivate and help destroy viruses and bacteria. - Antibodies Bacterium Storage proteins Transport proteins Function: Storage of amino acids Examples: Casein, the protein of milk, is the major source of amino acids for baby mammals. Plants have storage proteins in their seeds. Ovalbumin is the protein of egg white, used as an amino acid source for the developing embryo. g 0 o 0 Q —’ 95:33:? Ovalbumin Amino acids for embryo Function: Transport of substances Examples: Hemoglobin, the iron-containing protein of vertebrate blood, transports oxygen from the lungs to other parts of the body. Other proteins transport molecules across membranes, as shown here. Transport protein Cell membrane Hormonal proteins Receptor proteins Function: Coordination of an organism’s activities Example: Insulin, a hormone secreted by the pancreas, causes other tissues to take up glucose, thus regulating blood sugar concentration. '9 O O — High InsulEInd Normal blood sugar secre e blood sugar Function: Response of cell to chemical stimuli Example: Receptors built into the membrane of a nerve cell detect signaling molecules released by other nerve cells. Receptor protein olecules Contractile and motor proteins Structural proteins Function: Movement Examples: Motor proteins are responsible for the undulations of cilia and flagella. Actin and myosin proteins are responsible for the contrac- tion of muscles. Function: Support Examples: Keratin is the protein of hair, horns, feathers, and other skin appendages. Insects and spiders use silk fibers to make their cocoons and webs, respectively. Collagen and elastin proteins provide a fibrous framework in animal connective tissues. Collagen ...
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