Proteins.docx - Proteins Include a Diversity of Structures...

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Proteins Include a Diversity of Structures, Resulting in a Wide Range of Functions: Nearly every dynamic function of living beings depends on proteins Most enzymes are proteins Enzymatic proteins act as catalysts : speed up chemical reactions without being consumed in reaction All proteins constructed from same set of 20 amino acids linked in polymers Bond type: peptide bond Polypeptide : polymer of amino acids Protein : biologically functional molecule of one or more polypeptides folded and coiled into specific 3D structure Enzymatic proteins : Acceleration of chemical reactions Ex: digestive enzymes catalyze hydrolysis Storage proteins : Store amino acids Ex: casein Hormonal proteins : Coordination of organism’s activities/responses Ex: insulin- regulates blood sugar concentration Contractile and motor proteins : Cell movement Motor proteins- undulations of cilia and flagella Actin and myosin- contraction of muscles
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