BiologicalMolecules160-page16

BiologicalMolecules160-page16 - Biological Molecules 16...

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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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