1. Energy and Chemical Reactions

2. 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.

3. 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

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
ACTIVATION ENERGY
REACTANTS
PRODUCTS

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

12. Animations

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

15. 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

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

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