1. Enzymes 5/18/2015

2. ENZYMES I.Properties A.Highly Specific 1.Each reaction has own specific enzyme a)= Lock and key hypothesis 2.Sometimes enzyme molecules “tweak” reactants a)= Induced fit hypothesis B.Speed up reactions 1.Lower energy of activation

3. ENZYMES 2.All biochemical reactions need to reach certain energy level to react a)= Energy of activation 3.If activation energy is not reached, reaction will not occur 4.With enzyme activation energy is lowered so that reaction will occur at body temp 5.With out enzymes, cell reactions would not occur at 37°

4. ENZYMES C.Most enzymes are protein 1.Coded for by DNA D.Enzymes are affected by pH 1.All have optimal pH a)Catalase = pH 8 b)Stomach enzymes = pH 1-2 E.Enzymes have optimal temperature 1.Most operate best at 37° 2.Some can work at higher temperatures 3.All slow at cool temperatures 4.All reactions slow when exposed to cool temperatures 5.Enzymes denature if temperature is too hot a)Permanent damage F.Enzymes can be inhibited 1.Competitive 2.Non “