1. Enzymes
Necessary Proteins

2. Catalysts Catalysts are proteins Speed up chemical reactions
Necessary for synthesis & digestion reactions
Enzymes are biological catalysts.

3. 3

4. Enzymes Specificity Enzymes and substrates bind at the active site
Enzyme shape matches substrate shape
Enzymes can be reused
Enzymes and substrates bind at the active site
Enzyme

5. Enzymes are like…

6. Enzymes & Chemical Reactions
Enzyme names end in -ase.
sucrase (enzyme)
sucrose (substrate)
Enzymes are not changed by the reaction.
Substrates are changed
digested
synthesized

7. Examples of Enzymes
substrate
Active site

8. Examples of enzymes digestion reaction substrate active site enzyme
enzyme unchanged

10. Enzymes in action Catalyze synthesis and digestion reactions
Lewport Biology Place animation

11. Environmental Effects on Enzymes
Temperature pH
pH of 1-6 is an acid
pH of 7 is neutral
pH of 8-14 is a base
Enzymes work best at an optimum temp & pH

12. Temperature
Above the optimum temperature the enzyme denatures (changes shape).
Activity 5.5 on PearsonSuccessnet

13. Comparison of Enzymes

14. pH

15. Enzyme & Substrate concentration

16. Enzyme & substrate concentration

17. Enzyme & substrate concentration