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Enzymatic Proteins
- slective acceleration of chemical reactions
- Examples: Digestive enzymes
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Structural Proteins
- Support
- Examples: silk fibers; collagen and elastin in animal connective tissues; keratin in hair, horns, feathers, and other skin appendages
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Storage Proteins
- Storage of amino acids
- Examples: ovalbumin in egg white; casein, the protein of milk; storage proteins in plant seeds
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Transport Proteins
- Transport of other substances
- Examples: Hemoglobin, transport proteins
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Hormonal Proteins
- Coordination of an organism's activities
- Examples: inslulin; a hormone secreted by the pancreas
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Receptor Proteins
- Response of cell to chemical stimuli
- Examples: Receptors in nerve cell membranes
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Contractile and Motor Proteins
- Movement
- Examples: actin and myosin in muscles, protein in cilla and flagella
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Defensive Proteins
- Protection against disease
- Examples: antibodies combat bacteria and viruses
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