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Chemical reactions involve forming or breaking of chemical bonds Na + Cl NaCl Reactants Products The chemicals involvedThe chemicals at the start of.

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Presentation on theme: "Chemical reactions involve forming or breaking of chemical bonds Na + Cl NaCl Reactants Products The chemicals involvedThe chemicals at the start of."— Presentation transcript:

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3 Chemical reactions involve forming or breaking of chemical bonds Na + Cl NaCl Reactants Products The chemicals involvedThe chemicals at the start of a reactionproduced at the end of a reaction

4 Chemical Reactions Need help to get started Ex. Match starts a fire Activation Energy Energy required to get a chemical reaction started

5 Activation Energy REACTANTS PRODUCTS ACTIVATION ENERGY

6 A catalyst can reduce the activation energy needed to start a reaction. Speeds up the reaction Not consumed Reusable

7 Chemical reactions Catalysts help chemical reactions happen faster Work by decreasing the amount of activation energy required to get a chemical reaction started

8 Some reactions absorb energy while others release energy.

9 Enzymes Proteins that act as catalysts to control chemical reactions Are NOT changed when they perform task Used again and again

10 Specificity Fit like a “lock and key” VERY specific Each has only ONE reaction it can help Shape determines function

11 SUBSTRATE ENZYME-SUBSTRATE COMPLEX PRODUCTS ENZYME Unchanged & Reusable ENZYME ACTIVE SITE

12 Animations hill.com/sites/ /student_view0/chapter17/anim ation__enzyme_action_and_the_hydrolysis_of_sucrose.ht ml hill.com/sites/ /student_view0/chapter17/anim ation__enzyme_action_and_the_hydrolysis_of_sucrose.ht ml ions/Enzyme%20activity.html ions/Enzyme%20activity.html

13 Factors that effect enzymes Conditions that are too hot or too acidic cause proteins to unwind or denature Denaturing changes the shape of the active site Enzyme can’t bind to substrate Homeostasis (temp and pH) important for enzyme function

14 Naming enzymes Most end in _______-ase Beginning tells what it does Examples: Lipase-breaks down lipids Sucrase-breaks down sucrose DNA polymerase-polymerizes DNA Lactase-breaks down lactose Protease-breaks down proteins

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16 Homework: Biochemistry review

17 Homework: Read Section 7.1 and complete


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