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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?
1
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?
2
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
5
What Are Enzymes?• Most enzymes
are Proteins (tertiary and quaternary structures)
• Act as Catalyst to accelerates a reaction
• Not permanently changed in the process
6
Enzymes• Are specific
for what they will catalyze
• Are Reusable• End in –ase
-Sucrase-Lactase-Maltase
8
Enzymes
FreeEnergy
Progress of the reaction
Reactants
Products
Free energy of activation
Without Enzyme
With Enzyme
10
Enzyme-Substrate ComplexThe substance
(reactant) an enzyme acts on is the substrate
EnzymeSubstrate Joins
11
Active Site• The region of an enzyme molecule
in which substrate binds.
EnzymeSubstrate
Active Site
12
Lock and Key Mechanism• A theory that describes how only the correctly shaped substrate fits into a particular enzyme.
13
Lock and Key Mechanism• The enzyme is the lock.• The substrate is the key.
Enzyme
Active Sitesubstrate
14
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