1/24/12Do-Now: Take out yesterdays Chemistry Review Notes1. What is an atom?2. What are the three subatomic particles of the

atom and their charges?3. List three phases of matter. Which has the

most energy of the three phases? Explain.4. What are buffers & what do they help the body

to maintain?

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1/25/12Do-Now: Turn to pp441. What is organic chemistry the study of?2. Read “The Chemistry of Carbon,” write a 3

sentence summary over what you read.3. What is a monomer? A polymer?

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1/26/12Do-Now: Take out your Macromolecules Magic Squares HW

& “Chemistry of Life Book

1. List the 4 polymers found in living things.2. What are the monomers for each of the

polymers listed in #1?3. The amount of energy needed to start a

reaction is ___.4. Explain the difference between an ionic and a

covalent bond.

3

4

Enzymes

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What Are Enzymes?• Most enzymes

are Proteins (tertiary and quaternary structures)

• Act as Catalyst to accelerates a reaction

• Not permanently changed in the process

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Enzymes• Are specific

for what they will catalyze

• Are Reusable• End in –ase

-Sucrase-Lactase-Maltase

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How do enzymes Work?

Enzymes work by weakening bonds which lowers activation energy

8

Enzymes

FreeEnergy

Progress of the reaction

Reactants

Products

Free energy of activation

Without Enzyme

With Enzyme

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10

Enzyme-Substrate ComplexThe substance

(reactant) an enzyme acts on is the substrate

EnzymeSubstrate Joins

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Active Site• The region of an enzyme molecule

in which substrate binds.

EnzymeSubstrate

Active Site

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Lock and Key Mechanism• A theory that describes how only the correctly shaped substrate fits into a particular enzyme.

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Lock and Key Mechanism• The enzyme is the lock.• The substrate is the key.

Enzyme

Active Sitesubstrate

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What Affects Enzyme Activity?

Extreme Temperature are the most dangerous- high temps may denature (unfold) the enzyme.

Changes in pH (most like 6 - 8 pH near neutral)- Any variation from neutral may also denature the enzymes as well

Ticket Out The DoorProvide the meaning of the following:1. Equi- 8. Trans-2. Exo- 9. -ase3. Hyper- 10. Iso-4. Hypo- 11. Macro-5. Phago- 12. Poly-6. Pino- 13. Mono-7. -osis

14. How are atoms & elements different?15

9/2/11

Do-Now:

Complete the Chemistry & Biomolecules Crossword Puzzle.

Take out your Chemistry of Life Books.

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