A chemical reaction that occurs in or is produced by a living organism, such as digestion or photosynthesis.
From bio- (life) + reaction (a response to a stimulus), combining biology with chemistry terminology. The term became common in biotechnology and biochemistry during the 20th century.
Every time you eat a meal, millions of bioreactions happen instantly in your cells—enzymes are basically biological machines that speed up reactions that would otherwise take years!
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