Biology / Bio 0514 · Atom · ~20 seconds
Enzymes as Catalysts
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An enzyme is a protein catalyst that lowers a specific reaction's activation energy without being consumed or changing that reaction's overall free-energy change.
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Nearly every reaction inside a cell, from digestion to DNA replication, proceeds at a usable rate only because a specific enzyme catalyzes it.
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An enzyme changes a reaction's speed, never whether the reaction is exergonic or endergonic.