What do enzymes do in nature?



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    An enzyme is a protein that catalyzes (speeds up or makes possible) a chemical reaction. For example, many species of fungus and bacteria produce enzymes called cellulases which break down cellulose the structural material that makes use plant cell walls into simpler molecules, like sugars that the organism producing the cellusases can eat.

    The protein that copies the DNA inside each of our cells is also an enzyme. It fastens together the four different subunits (represented by A, T, G, and C) which make up our DNA into long DNA strands.

    Our own bodies make hundreds or thousands of different enzymes for different tasks, and every living thing makes enzymes of its own. 

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