Enzymes

• Catalyst

  -substance that speeds up the rate of chemical reaction without being changed/used up

  *Enzymes(large proteins) are biological catalysts
• -Enzymes active site is complimentary to the substrate

  -if substrate does not fit active site, reaction will not be catalysed

  -Enzymes are SPECIFIC
• lock&key model vs induced fit model

  *lock & key model

  -scientists thought that substrate had to fit perfectly into active site, like a lock and key

  *induced fit model(more accurate model)

  -enzyme actually change shape slightly as it binds to substrate

  *active site is complimentary to substrate