Enzyme - National Human Genome Research Institute
https://www.genome.gov/node/41621
WEB3 days ago · Definition. 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. Narration.
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