Do Now: Answer the following Questions. What is the function of the cell membrane? Do animals, plants, or both have a cell membrane? What does a plant have surrounding the cell in addition to a cell membrane?

Announcements Organelle Quiz - Friday!

Cell Membrane Function Objective: To be able to understand the function of the cell membrane as it relates to diffusion, osmosis, and active transport.

Copyright Pearson Prentice Hall Cell Membrane Outside of cell Cell membrane Inside of cell (cytoplasm) Protein channel Proteins Lipid bilayer Carbohydrate chains Functions Regulates what goes in and out of a cell Maintains homeostasis Characteristics Lipid bilayer that carries a charge Protein channels

Copyright Pearson Prentice Hall Cell Membrane Outside of cell Cell membrane Inside of cell (cytoplasm) Protein channel Proteins Lipid bilayer Carbohydrate chains 2 ways to enter or leave a cell Passive Transport (Diffusion) Through the membrane Through a protein channel Active Transport

Cell membranes Have pores (holes) in it Selectively permeable (semi-permeable) Allowing some molecules in and keeps other molecules out. Materials are moved through membrane by passive transport or active transport

Types of Cellular Transport Passive Transport (High Concentration to Low Concentration) cell doesn’t use energy 1.Diffusion 2.Facilitated Diffusion 3.Osmosis Active Transport (Low Concentration to High Concentration) cell does use energy high low This is going to be hard work!! high low Weeee!!!

Cell Model Project Create a model of a cell Can be 2-D or a 3-D model – CANNOT be a colored diagram of a cell Be creative – use food, household materials to make different organelles! Choose a plant or animal cell to create (fill in on your instruction form).

Cell Model Project Rubric – Creativity – Labelling – Organelle – Organelle Function – Organelle Identification

Complete the Venn Diagram Below

Do Now! Record data for the Osmosis/Diffusion Lab (Cell Membrane Model) Make sure you have your “Control Group” Data (Chemical Test Results) – record the color of the solution in your table. Benedicts and water or starch Benedicts and glucose Iodine and starch Iodine and water or glucose Row 2 Row 1

Announcements Homework: Answer the questions on your Osmosis/Diffusion Lab. Due on Monday. Clear your desks for the quiz.

Passive Transport How to cross the membrane without using _________________ high low Weeee!!!

Copyright Pearson Prentice Hall Passive Transport: Diffusion What Happens During Diffusion? Particles move from high concentration to low concentration When the concentration of the particles is the same throughout a system, the system has reached equilibrium.

Why do molecules diffuse? Because they are in constant motion

Copyright Pearson Prentice Hall Diffusion Through Cell Boundaries Solution A solution is a mixture of two or more substances. – Examples: Lemonade – Solute – substance that is dissolved (powder) – Solvent – material that is dissolving the substance (water) Concentration = the mass of solute (mass of powder) in a given volume of solution (volume of water), or mass/volume.

Copyright Pearson Prentice Hall Diffusion Through Cell Boundaries ABCABC Time

Diffusion Some molecules are too large or charged, to pass through the membrane using simple diffusion. How will the cell reach equilibrium with the external environment?

Facilitated diffusion: Diffusion of specific particles using protein channels found in the membrane Protein channels allow only specific molecules through Facilitated diffusion (Protein channel) Facilitated Diffusion (High Concentration to Low Concentration)

Copyright Pearson Prentice Hall Osmosis What is osmosis? Osmosis the diffusion of water through a selectively permeable membrane (semi-permeable) Time

Red Onion Cell Osmosis content/uploads/2014/04/onion_plasmolysis_ animated_sm.gif content/uploads/2014/04/onion_plasmolysis_ animated_sm.gif

Which way will the water move? Selectively permeable membrane

Which way will the water move?

Watch this Video! Pay attention to when the following terms are mentioned Isotonic - Hypertonic - Hypotonic - Egg Osmosis

Write a definition for the following terms related to osmosis based on the pictures (Describe which way the water is moving). Isotonic - Hypertonic - Hypotonic -

Exit Slip: What are two differences between diffusion and osmosis? Give an example of each What does diffusion, facilitated diffusion, and osmosis all have in common?