Concept10 - Concept 5.4 Proteins have many structures,...

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Concept 5.4 Proteins have many structures, resulting in a wide range of functions Proteins account for more than 50% of the dry mass of most cells. They are instrumental in  almost everything that an organism does. Protein functions include structural support, storage, transport, cellular signaling,  movement, and defense against foreign substances. Most important, protein enzymes function as  catalysts  in cells, regulating metabolism by  selectively accelerating chemical reactions without being consumed. Humans have tens of thousands of different proteins, each with a specific structure and  function. Proteins are the most structurally complex molecules known. Each type of protein has a complex three-dimensional shape or conformation. All protein polymers are constructed from the same set of 20 amino acid monomers. Polymers of proteins are called 
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Concept10 - Concept 5.4 Proteins have many structures,...

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