biology- enzymes

• enzymes are catalysts produced by living things
• a catalyst is a substance which increases the speed of a reaction without being charged or used up in the reaction
• enzymes are large proteins which are made up of chains amino acids
• a higher temperature increases the rate of reaction for enzymes at first. But if it gets too hot some of the bonds holding the enzyme together break and the enzyme is denatured
• enzymes work best at optimum temperature and pH
• enzymes are represented by the lock and key model