Presentation on theme: "ENZYMES ARE PROTEINS THAT SPEED UP SPECIFIC REACTIONS IN CELLS"— Presentation transcript:
1 ENZYMES ARE PROTEINS THAT SPEED UP SPECIFIC REACTIONS IN CELLS CHAPTER 5.5ENZYMES ARE PROTEINS THAT SPEED UP SPECIFIC REACTIONS IN CELLSDo Now: Cracker ActivityPredict what cracker will taste like at the beginning and end of the minute. Chew for 1 minute without swallowingCracker should taste sweet at end of 1 minute because amylase enzyme breaks down starch into maltose
2 ENZYMES AND ACTIVATION ENERGY Activation Energy- the energy needed to start a reactionEXAMPLE: Candle BurningIf you heat something to lower the activation energy structures in the cell can become destroyedTherefore, we need enzymes!
3 ENZYMES AND ACTIVATION ENERGY Catalysts- substances that speed up chemical reactionsEnzyme- the main catalyst of chemical reactions
4 Enzymes Foods have Enzymes! Speed up reactions! Example: Fruits and Vegetables, Nuts, SeedsENZYMES ARE PROTEINS_Help Digestion and Fighting Bacteria
5 What are enzymes? Your body has lots of reactions! Enzymes: Special Proteins that speed up specific reactionsEnd in ASEEx. Lactase digest lactoseHOW?Some people are lacking this enzyme, take the lactase enzyme as a pill
6 Enzymes Lower Activation Energy The energy needed to get a reaction started
7 Lower the Activation Energy Activation energy is the “start up” energy of a reactionEnzymes speed up reactions by lowering the activation energyThey do not raise the temp!
8 Enzymes Without Enzyme With Enzyme Free Energy Progress of the reactionReactantsProductsFree energy of activation
19 Enzymes are Reusable Enzymes will speed the reaction for a substrate It will release the product and will work on another substrate
20 Examples Lipase Protease Lactase Sucrase Amylase Life is not possible without enzymes! !!!!!!!-catalase found in contact lens cleaner, breaks down hydrogen peroxide, but how did h202 get there?When you get a cut and add catalase, it bubbles, why?Biproduct of all cells, but poisonous!!! So we need to break it down and get rid of itCatylase breaks it down into water and oxygen