Enzymes are BIOLOGICAL CATALYSTS
They SPEED up reactions by LOWERING ACTIVATION ENERGY
Enzymes are PROTEINS
They have a 3D shape called the ACTIVE SITE
Lock and Key hypothesis:
Substrate fits right into the active site like a lock and key
Induced fit model:
The substrate forces the active site to change shape
To form the ENZYME SUBSTRATE COMPLEX
Why are enzymes SPECIFIC?
Active site is COMPLIMENTARY to one substrate only
They are proteins
They have a certain shape due to folding in the TERTIARY structure
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