Biology 3ro esquema de contenidos nodales - dic 2018
Powerpoint enzymes models of action
1. Enzyme Action Enzymes : proteins that function as biological catalysts. Catalyst : a substance that speeds up a chemical reaction and is not changed by the reaction.
3. Lock and Key However certain substances can bind to the enzyme at sites other than the Active site and modify its activity (inhibitors/co-factors) Idea that the enzyme is flexible
9. Enzyme activity How fast an enzyme is working Rate of Reaction Rate of Reaction = Amount of substrate changed (or amount product formed) in a given period of time.
15. Rate of Reaction Temperature 0 20 30 50 10 40 60 40 o C - denatures 5- 40 o C Increase in Activity <5 o C - inactive
16. Effect of heat on enzyme activty If you heat the protein above its optimal temperature bonds break meaning the protein loses it secondary and tertiary structure
18. Effect of heat on enzyme activty Denaturing the protein ACTIVE SITE CHANGES SHAPE SO SUBSTRATE NO LONGER FITS Even if temperature lowered – enzyme can’t regain its correct shape