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What are enzymes?

Updated: Jan 3, 2020

Enzymes speed things up! Learn about enzymes through the example of lactase, an enzyme that speeds up the reaction to break down the sugar lactose, found in milk. People who don't make enough lactase become lactose-intolerant.

This video is part of the Bio-Dictionary for "The Explorer's Guide to Biology" (XBio for short), which is a bold re-imagining of the biology textbook for the 21st century. Visit for free content that focuses on stories of scientific discovery.

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