Biology I: Biology I:

Homeostasis and Homeostasis and Transport (Part 1)Transport (Part 1)

Mr. NettlesMr. Nettles

Agenda – Tuesday, Sept. 13, Agenda – Tuesday, Sept. 13, 20112011

Warm-Up (7 min)Warm-Up (7 min)

Today’s Agenda (3 min)Today’s Agenda (3 min)

Lesson (25 min)Lesson (25 min)

Wrap-Up (5 min)Wrap-Up (5 min)

Review- Review- BiomoleculesBiomolecules (15 min) (15 min)

Warm-Up (Bonus!!)Warm-Up (Bonus!!)1.1. Which molecules store and transmit genetic Which molecules store and transmit genetic

information?information? a) lipids, b) proteins, c) nucleic acids, d) carbohydratesa) lipids, b) proteins, c) nucleic acids, d) carbohydrates

2.2. Antibodies are composed primarily of amino Antibodies are composed primarily of amino acids. In which class of biomolecules would acids. In which class of biomolecules would antibodies belong?antibodies belong?

a) lipids, b) proteins, c) nucleic acids, d) carbohydratesa) lipids, b) proteins, c) nucleic acids, d) carbohydrates

3.3. Which cell structures cause the outer surface of Which cell structures cause the outer surface of the endoplasmic reticulum to appear rough?the endoplasmic reticulum to appear rough?

a) ribosomes, b) proteins, c) the mitochondria, d) the Golgia) ribosomes, b) proteins, c) the mitochondria, d) the Golgi

Warm-Up (Bonus!!)Warm-Up (Bonus!!)1.1. Which molecules store and transmit genetic Which molecules store and transmit genetic

information?information? a) lipids, b) proteins, a) lipids, b) proteins, c) nucleic acidsc) nucleic acids, d) carbohydrates, d) carbohydrates

2.2. Antibodies are composed primarily of amino Antibodies are composed primarily of amino acids. In which class of biomolecules would acids. In which class of biomolecules would antibodies belong?antibodies belong?

a) lipids, a) lipids, b) proteinsb) proteins, c) nucleic acids, d) carbohydrates, c) nucleic acids, d) carbohydrates

3.3. Which cell structures cause the outer surface of Which cell structures cause the outer surface of the endoplasmic reticulum to appear rough?the endoplasmic reticulum to appear rough?

a) ribosomesa) ribosomes, b) proteins, c) the mitochondria, d) the Golgi, b) proteins, c) the mitochondria, d) the Golgi

Today’s ObjectivesToday’s Objectives

I will define: I will define: homeostasis, semi-homeostasis, semi-permeable, concentration, and permeable, concentration, and equilibriumequilibrium..

I will describe I will describe three types of three types of passive transportpassive transport..

HomeostasisHomeostasis Cells Cells must maintain a stable must maintain a stable

internal environmentinternal environment..a)a) having the right amount of water having the right amount of water

and nutrientsand nutrients

b)b) getting rid of wastesgetting rid of wastes

c)c) staying at the right temperaturestaying at the right temperature

HomeostasisHomeostasis = = the ability to the ability to maintain a stable internal maintain a stable internal (inside) environment(inside) environment

Think!!Think!!

What does the cell membrane do?What does the cell membrane do?

Moving Across the Cell Moving Across the Cell MembraneMembrane The cell membrane is The cell membrane is semi-semi-

permeable permeable meaning meaning some some things can go across and things can go across and others can’t.others can’t.

ConcentrationConcentration = how crowded a = how crowded a certain location is with certain location is with moleculesmolecules

What’s happening in this What’s happening in this picture?picture?

semipermeable

EquilibriumEquilibrium

Equilibrium:Equilibrium:Both sides are equal

Nature wants equilibrium!

Passive TransportPassive Transport

The movement of materials in and out The movement of materials in and out of the cell of the cell without using energywithout using energy is is called called passive transportpassive transport..

There are 3 types of passive There are 3 types of passive transport:transport:– DiffusionDiffusion– Facilitated diffusionFacilitated diffusion– OsmosisOsmosis

DiffusionDiffusion Molecules Molecules move from areas of move from areas of

high concentration to areas of high concentration to areas of low concentration.low concentration.

Molecules Molecules move to areas that move to areas that are less crowded.are less crowded.

Think!!Think!! When is equilibrium reached?When is equilibrium reached?

Facilitated DiffusionFacilitated Diffusion

Diffusion that Diffusion that involves a protein involves a protein channel or carrierchannel or carrier– Does NOT use energyDoes NOT use energy

Wrap-UpWrap-Up

1.1. What is homeostasis?What is homeostasis?

2.2. True or False? True or False?

Passive transport is the moves Passive transport is the moves materials in and out of the cell using materials in and out of the cell using energy. energy.

3.3. List the three types of passive List the three types of passive transport.transport.

Review: Review: BiomoleculeBiomolecule BingoBingo This is a chance to earn 5% points This is a chance to earn 5% points

of Friday’s Quiz!!of Friday’s Quiz!!

Listen carefully to the “bingo clues” Listen carefully to the “bingo clues” and write down the name of the and write down the name of the biomolecule related to the clue.biomolecule related to the clue.

Carbohydrates, Lipids, Carbohydrates, Lipids, Proteins, Nucleic AcidsProteins, Nucleic Acids