Energy and Chemical Reactions

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Chemical Reactions and Enzymes

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Presentation transcript:

Energy and Chemical Reactions

OBJECTIVES: RELATE ENERGY AND CHEMICAL REACTIONS OBJECTIVES: RELATE ENERGY AND CHEMICAL REACTIONS DESCRIBE THE ROLE OF ENZYMES DO NOW: Take out your homework. Then…is cellulose a monosaccharide or polysaccharide? Where is it found? HOMEWORK: finish concept 5 packet Review sheet due Moday.

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

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

Activation Energy ACTIVATION ENERGY REACTANTS PRODUCTS

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

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

Some reactions absorb energy while others release energy.

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

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

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

Animations http://highered.mcgraw-hill.com/sites/0072943696/student_view0/chapter17/animation__enzyme_action_and_the_hydrolysis_of_sucrose.html http://www.lpscience.fatcow.com/jwanamaker/animations/Enzyme%20activity.html

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

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

OBJECTIVES: RELATE ENERGY AND CHEMICAL REACTIONS OBJECTIVES: RELATE ENERGY AND CHEMICAL REACTIONS DESCRIBE THE ROLE OF ENZYMES DO NOW: Take out your homework. Then…Where are electrons, protons, and neutrons located? How many protons does an atom with an atomic number of 9 have? Neutrons? HOMEWORK: Review sheet, test Tuesday

Do Now: Review your notes for quiz Homework: Biochemistry review

Warm Up: Review notes quietly for 5 minutes Homework: Read Section 7.1 and complete