Chapter 5) Enzymes

Enzyme

A biological catalyst that speeds up reaction

Substrate

The molecule the enzyme acts on

enzyme-substrate complex

A temporary complex formed during a reaction

Products

The molecules formed from the reaction

lock and key model

Substrate fits exactly into the enzyme's active site

Catalyst

A substance that increases the rate of a chemical reaction without being used up or changed itself

Effect of temperature on enzymes?

Increases rate until optimum, then denatures at high temperature

Effect of pH on enzymes?

Each enzyme has an optimum pH; extremes denature it