Enzymes in cells
Why?
Enzymes are proteins that speed up reactions in cells; each one fits its substrate like a key in a lock.
A starch chain slides into the active site of an amylase enzyme and is snipped into sugar pieces that float away.
Press the button to watch amylase break starch, then heat it up.
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At body temperature an enzyme works fast, but heated to 70 degrees it changes shape and the substrate no longer fits.
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