2. Enzymes Proteins Act as catalysts to speed up chemical reactions Are specific – each enzyme can carry out only one type of reaction. Animation of Enzyme activity –http://highered.mcgraw- hill.com/sites/0072495855/student_view0/chap ter2/animation__how_enzymes_work.htmlhttp://highered.mcgraw- hill.com/sites/0072495855/student_view0/chap ter2/animation__how_enzymes_work.html

3. Active Site EnzymeSubstrate + = Enzyme- Substrate Complex ++ Enzyme Products

4. Inhibitors Slow down chemical reactions. –Competitive inhibitors compete with substrates for the active site –Allosteric inhibitors change the shape of the active site so the substrate can’t attach to the enzyme

5. Competitive Inhibitor Substrate Enzyme Inhibitor blocks active site stopping enzyme activity.

6. Enzyme + Allosteric Inhibitor Active Site shape changed No connection