Eagle Zone -Turn in your current Event to the pink basket -Write down your homework in AGENDA: Complete “Cell City”

homework in your spiral-under Unit 3 on website

-Get out your notes spiral and be ready to take notes when the bell rings.

Announcements:

1. Project Due Next Wednesday by 4pm

2. Quiz over cell organelles and functions next Wednesday (Tues 8th)

3. Quiz over identifying organelles in a cell next Friday(Thurs 8th)

Cell MembraneOutsideof cell

Insideof cell(cytoplasm)

Cellmembrane

Proteins

Proteinchannel Lipid bilayer

Carbohydratechains

TAKS

Objective 2 – The student will demonstrate an understanding of living systems and the environment.

TEKS Science Concepts

4 -The student knows that cells are the basic structures of all living things and have specialized parts that perform specific functions, and that viruses are different from cells and have different properties and functions.

(B) investigate and identify cellular processes including homeostasis, permeability, energy production, transportation of molecules, disposal of wastes, function of cellular parts, and synthesis of new molecules

Engage

Can you smell what is inside the balloon?

Eagle Zone 1)Give the function of the following cell

organelles AND tell what type of eukaryote they are found in: Golgi apparatus, ribosomes, mitochondria,

chloroplast

2)What three organelles are found in a plant cell that are not in an animal cell?

3)What is the main difference between a virus and a bacteria?

4)Why does a virus need a host cell?– 15 minutes

Explore Veggie Lab-Write the questions

Retrieve a piece of vegetable from the beaker labeled water. Describe the following in your LAB BOOK:

• What does the vegetable look like? (color, shape, size, feel)

• Try to bend the vegetable. Describe what happens

• Which direction do you think the water traveled, inside or outside of the cell membrane of the vegetable? Why?

When you are done with BOTH salt and tap water, answer these questions:

• Define semi-permeability

• If water is moving across a membrane, what is the name of that process?

Explain: Cell Diversity

Cells within the same organism show Enormous Diversity in: Size Shape Internal Organization

A. Cell Size

Female Egg - largest cell in the human body; seen without the aid of a microscope

Most cells are visible only with a microscope.

Why do you think most cells are so small?

Cells are small for 2 ReasonsReason 1: Limited in size by the RATIO between their Outer

Surface Area and Their Volume. 

A small cell has more SURFACE AREA than a large cell for a GIVEN VOLUME OF CYTOPLASM. 

Cells are Small

Reason 2: THE CELL'S NUCLEUS (THE BRAIN)

CAN ONLY CONTROL A CERTAIN AMOUNT OF LIVING, ACTIVE CYTOPLASM.

B. Cell Shape

Diversity of form reflects a diversity of function.

THE SHAPE OF A CELL DEPENDS ON ITS FUNCTION.  

Prokaryotic Cell

Cell membrane

Cell membrane

Cytoplasm

Cytoplasm

Nucleus

Organelles

Eukaryotic Cell

C. Internal Organization

Membrane structure

Semi-Permeable-allows some materials to pass through membrane to cell while others are not capable

Selectively Permeable

Amphipathic~ hydrophobic & hydrophilic regions

Fluid Mosaic Model

Outsideof cell

Insideof cell(cytoplasm)

Cellmembrane

Proteins

Proteinchannel Lipid bilayer

Carbohydratechains

The Structure of the Cell Membrane

Explore 2

Cell Membrane Manipulative In groups, you will construct a model of the cell

membrane using the materials provided for you at the table

Once you have constructed your model, have it examined by the teacher for completeness. Each person in your group must say at least 1 thing about the model before your group can be awarded completion points on your lab ticket

Membrane traffic

Passive transport~ diffusion of a substance across a biological membrane (NO ENERGY)

Diffusion~ particles movement from

high concentration to

low concentration Osmosis~ the diffusion of

water across a selectively permeable membrane

Results of Diffusion

Dynamic equilibrium Once diffusion has evenly distributed the

particles; movement of particles continues with no change in concentration

Homeostasis Preservation of equilibrium

Diffusion depends on Concentration gradient

Concentration gradient: the difference in concentration of a substance across space

Diffusion is said to move down a concentration gradient

Diffusion continues until there is NO concentration gradient

Ex: O2 diffuses into oxygen depleted blood

Diffusion

QuickTime™ and aCinepak decompressor

are needed to see this picture.

Small molecules like WATER, OXYGEN, AND CARBON DIOXIDE can move in and out freely.

Large molecules like PROTEINS AND CARBOHYDRATES CANNOT

Charged IONS CANNOT

Osmosis~ the diffusion of water across a selectively permeable membrane

Small quiz- use white boards

Osmosis is the diffusion of _______ across a cell membrane.

Osmosis and Diffusion are both types of __________ transport.

Passive transport does or does not require energy? Small molecules can not move across freely. T or F Large molecules can move freely. T or F

Three Different Types of Solutions

Isotonic Solution

Hypotonic Solution

Hypertonic Solution

Isotonic Solution

The solute outside the cell is equal in concentration to the solute in the cell.

The cell retains its shape. water moves equally in both directions

Hypotonic Solutions

Solution outside the blood cell contains a lower [] of solute than inside of the cell.

Water will diffuse in. cell will lyse (burst).

Animal cells - cytolysis. Plant cells do not burst- turgur pressure—

grocers use this idea

Cells in a Hypotonic Solution

Hypertonic Solutions The solution outside the cell has a higher [] of solute than inside of the

cell. Water will diffuse out of the cell,

causing the cell to shrink or crenate

Why should you not salt meat before cooking?CRENATION PLASMOLYSIS

Cells in a Hypertonic Solution

Review:In what type of solution would these cells be found?

Water balance Summary

Plasmolysis Turgidity

QuickTime™ and aCinepak decompressor

are needed to see this picture.

QuickTime™ and aCinepak decompressor

are needed to see this picture.

Elaborate

Semi-Permeability Lab Eggactly What I Predicted

Eagle Zone

Your test over Unit 3 will be Monday (B day and 8th period) and Tuesday (A day)

Get ready for the scavenger hunt!! You need something to write with

Winner will receive prize tomorrow