3/31 Daily Catalyst Pg. 43 Osmosis 1. For molecules to diffuse, they must move from _________ concentration to _________ concentration. 2. Mrs. Ireland gives you a mystery cell. The cell appears to have a rod-shape. What type of cell is this? 3. How will the solute molecules move in the cell below if the cell is using diffusion?

3/31 Daily Catalyst Pg. 43 Osmosis 1. For molecules to diffuse, they must move from _________ concentration to _________ concentration. 2. Mrs. Ireland gives you a mystery cell. The cell appears to have a rod-shape. What type of cell is this? Prokaryote 3. How will the solute molecules move in the cell below if the cell is using diffusion? HIGH LOW

3/31 Class Business Pg. 43 Osmosis Quiz #10 on Wednesday Cell and Transport test on Wednesday Review day on Tuesday M.C. on cells and transport Tutoring available Spring Break review packet due Tuesday, April 7th

3/31 Agenda Pg. 43 Osmosis Daily Catalyst Class Business Osmosis notes Lab time Exit Ticket #9

Transport Review Label the integral protein: This type of protein acts as an appendage to the bilayer d, c, and e Label the hydrophobic tail A This structure allows molecules to cross one side of the membrane to the other like a bridge: a

PASSIVE TRANSPORT DIFFUSION OSMOSIS

Diffusion Review Diffusion is when solutes/molecules move across a membrane, but sometimes the solutes cannot get through. This is when osmosis happens.

Key Point #1: Osmosis is the movement of water from high to low concentrations.

Osmosis is passive transport This means… ATP (energy) is not used Water molecules move from high to low concentrations

OSMOSIS Water is moving in osmosis

Which way will water move? Key Point #2: Water will move in and out of the cell until the concentration is equal.

Prefixes Iso-  same as Hypo-  less than Hyper-  more than

Concentration is equal. No net water movement. Isotonic Solution Key Point #3: Isotonic: Concentration is equal. No net water movement.

Inside Cell Outside Cell Isotonic Solution The red dots are water molecules Outside Cell

Key Point #4: Less water in the cell Water moves INTO the cell. Hypotonic Solution Key Point #4: Less water in the cell Water moves INTO the cell.

Outside Cell Inside Cell Hypotonic Solution The red dots are water molecules

Outside Cell Hypotonic Solution Inside Cell Water Water Water

Inside Cell Outside Cell Water Water Hypotonic Solution Water Hypo=Hippo Water Water

Key Point #5: More water inside the cell Water moves OUT of the cell. HYPERtonic Solution Key Point #5: More water inside the cell Water moves OUT of the cell.

Hypertonic Solution Outside Cell Inside Cell

Hypertonic Solution Outside Cell Inside Cell Water Water Water

Hypertonic Solution Inside Cell Water Water Outside Cell Water

Tell me what ya know! A cell is bathed in fluid. However, you notice that water is flowing out of the cell. In what kind of solution is this cell immersed? Hypertonic Solution hyper

Label the following cells as hypotonic, hypertonic, or isotonic. (the red dots are water molecules) 1 3 2

Draw and describe a plant cell in a hypotonic solution Draw and describe a plant cell in a hypotonic solution. How will a plant cell respond differently than an animal cell? Why?

Draw in your notes

Onion Cell before and after being put in a Hypotonic Solution Before After Hypotonic Solutions absorbs so much water out of the water out of cells that they may burst open. The plant cells usually do not explode. WHY??

Animal Cells Mostly do Explode Because: They don’t have a cell wall to keep the structure intact, but plant cells do

Lab Work Time Directions: With your group, complete the Tuesday (Day 2) directions. We are making observations of our test subjects. Time: 10 minutes Noise: 2 (with group members)

Exit Ticket #9 Name: _______ Date: 3/31 Period: 1 Score: ______/4 Indicate the direction of water: a .5% sucrose solution cell and a 2% sucrose solution cell- separated by a membrane not permeable to sucrose. What will the cell do?! .5% Sucrose 2% Sucrose Sucrose can’t move, but water can! So Water will move to equalize concentrations. The water will move from the .5% cell to the 2% cell to equalize concentrations. The 2% cell will fill with water until the cell burst

Diffusion Osmosis Active transport Endocytosis Exocytosis Definition Active/passive? Real Example Drawing