Biological Molecules - 16Amino Acids and ProteinsProteins are very large molecules composed of combinations of 20 different aminoacids. The precise physical shape of a protein is very important for its function.A single cell may have 10,000 or more different proteins. This diversity ofproteins is essential for the functioning of each cell in a living organism.Functions of Protein1.Structural•Component of all cell membranes•Component of cytoplasm "cytoskeleton"•Component of movement or contractile structures, such as muscle, ciliaand flagella microtubules ––– contractile properties•Component of hair, nails horns, etc. (Keratin is the main protein of thesesubstances)2.Metabolic molecules•Hormones – regulatory chemicals•Energy transfer molecules for cell respiration (cytochromes)•Oxygen carrier in circulation (hemoglobin)•Antibodies•EnzymesProbably most "famous"Facilitate rate of chemical reactionProtein StructureThe protein structure is critical for its function. Each protein has a unique shape
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