2. ENZYMES Objective: students will participate in saltine cracker demonstration and take notes on enzymatic activity

3. Keep the cracker in your mouth WITHOUT eating it for the length of the video AFTER WATCHING THE VIDEO, EXPLAIN WHAT HAPPENED TO THE CRACKER

4. http://www.youtube.com/watch?v=XTUm- 75-PL4http://www.youtube.com/watch?v=XTUm- 75-PL4 AFTER WATCHING THE VIDEO, EXPLAIN WHAT HAPPENED TO THE CRACKER

5. ENZYMES ARE PROTEINS

6. Enzymes –build molecules synthesis –breakdown molecules digestion ++ s3

7. ENZYMES ARE….. A CATALYST…MEANING THEY SPEED UP REACTIONS IN THE BODY. WHAT WOULD HAPPEN TO THE FOOD YOU EAT IF THERE WERE NO ENZYMES????

8. ENZYMES LOWER THE AMOUNT OF ENERGY NEEDED TO DO A REACTION –MAKES REACTION OCCUR FASTER AND EASIER!

9. ENZYMES ARE VERY SPECIFIC! EVERY MOLECULE HAS A SPECIFIC ENZYME THAT CAN BIND WITH IT TO CREATE A REACTION –LIPASE WILL ONLY BIND WITH LIPID –LACTASE WILL ONLY BIND WITH LACTOSE –GLUCASE WILL ONLY BIND WITH GLUCOSE Oh, I get it! They end in -ase

10. OH THOSE PICKEY ENZYMES! –each enzyme needs to be the right shape for the job –LIKE A LOCK AND KEY ONLY A SPECIFIC KEY CAN FIT IN LOCK TO OPEN A DOOR ONLY A SPECIFIC ENZYME CAN FIT IN A MOLECULE TO START A REACTION

12. Enzymes

13. View how they are specific http://www.kscience.co.uk/animations/anim_2.htm

14. 1 2 3

15. Enzyme vocabulary Enzyme –helper molecule Substrate –molecule that enzymes work on Enzyme-substrate complex –enzyme & molecule temporarily joined Active site –part of enzyme that substrate molecule fits into s10

16. 1 2 3

17. ENZYMES DO NOT CHANGE AFTER A REACTION and ENZYMES CAN BE USED OVER & OVER AGAIN JUST LIKE A LOCK AND KEY…WHEN YOU PUT THE KEY IN A LOCK AND TAKE IT OUT AGAIN…DID IT CHANGE? NO!!!!

18. WHAT CAN AFFECT HOW WELL AN ENZYME WORKS? TEMPERATURE (TOO COLD OF TEMPERATURE COULD MEAN SLOWER REACTION) PH CONCENTRATION (NUMBER OF ENZYMES)

19. In review…. http://www.youtube.com/watch?v=WfAsw Ymwb_shttp://www.youtube.com/watch?v=WfAsw Ymwb_s

20. COPY INTO NOTEBOOK