An enzyme is a protein that acts as a biological catalyst to speed up chemical reactions in cells.
Catalyst: A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
Protein: Large molecules composed of one or more chains of amino acids in a specific order; the order is determined by the base sequence of nucleotides in the gene coding for the protein.
Active Site: The specific region on an enzyme where substrate binds and catalysis takes place or where chemical reaction occurs.
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