Biological Molecules - 16 Amino Acids and Proteins Proteins are very large molecules composed of combinations of 20 different amino acids. 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 of proteins is essential for the functioning of each cell in a living organism. Functions of Protein 1. Structural • Component of all cell membranes • Component of cytoplasm "cytoskeleton" • Component of movement or contractile structures, such as muscle, cilia and flagella microtubules ––– contractile properties • Component of hair, nails horns, etc. (Keratin is the main protein of these substances) 2. Metabolic molecules • Hormones – regulatory chemicals • Energy transfer molecules for cell respiration (cytochromes) • Oxygen carrier in circulation (hemoglobin) • Antibodies • Enzymes Probably most "famous" Facilitate rate of chemical reaction Protein Structure The protein structure is critical for its function. Each protein has a unique shape
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This note was uploaded on 12/29/2011 for the course BIO 151 taught by Professor Edwards during the Spring '10 term at SUNY Stony Brook.