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  • A protein that acts as a catalyst in biological systems.
  • a protein that contains a catalytic site for a biochemical reaction
    Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row
  • catalyst that is secreted by protoplasm to bring about or hasten a reaction, but that is not consumed in the process
    Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
  • An enzyme is a biological catalyst and is almost always a protein. It speeds up the rate of a specific chemical reaction in the cell. The enzyme is not destroyed during the reaction and is used over and over. A cell contains thousands of different types of enzyme molecules, each specific to a particular chemical reaction.

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