+ Bellwork (11/5) What are the two macromolecules that make up the cell membrane? What is the function of the cell membrane? Use your prefix dictionary… What does HYDROPHOBIC mean? What does HYDROPHILIC mean

+ Cell Transport

+ Cell Membrane Also called… Plasma membrane Phospholipid bilayer Semipermeable bilayer Fluid Mosaic Model

+ Cell Membrane Function: Allows molecules to move in and out of the cell Structure: Phospholipid Bilayer Proteins

+ Cell Membrane

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+ Today… Please go get your science NBs Make sure you have your Osmosis Lab from last class period (if you don’t, come get one from me!)

+ Equilibrium Concentration of a substance is equal through a space Cells want equilibrium!

+ Equilibrium Cells are not always in equilibrium but they will try to get there! Concentrations 50% salt 50% water 10% salt 90% water HIGH CONCENTRATION! LOW CONCENTRATION!

+ Equilibrium What would happen?

+ Equilibrium What would happen? Will try to create equilibrium High concentration  low concentration

+ Equilibrium High concentration  low concentration Concentration gradient

+ Cell Transport Cell membrane acts as a door to let things in and out of the cell… Passive Transport Diffusion Osmosis Facilitated Diffusion Active Transport

+ Day 1 of Grape Osmosis Lab

+ Passive Transport Reading Pass out

+ Passive Transport Cell membrane acts as a door to let things in and out of the cell… Passive Transport Movement across the cell membrane that does not require energy Moves down the concentration gradient (high conc. to low conc.)

+ Diffusion Diffusion: passive transport does not require energy Movement down concentration gradient

+ Diffusion DIFFUSION= movement of molecules from a high concentration to a low concentration until equilibrium.

+ Diffusion DIFFUSION= movement from a high concentration to a low concentration until equilibrium.

+ Passive Transport Cell membrane is selectively permeable Some things can diffuse and some can’t

+ Passive Transport Cell membrane is made of lipids… Cell membrane CAN diffuse: Small and nonpolar molecules Cell membrane can NOT diffuse: Large and polar molecules (large and in charge)

+ Osmosis Osmosis: passive transport does not require energy movement down concentration gradient OSMOSIS= diffusion of water through a cell membrane

+ Osmosis OSMOSIS= diffusion of water through a cell membrane

+ Osmosis There are three different kinds of water movement directions 1. Water moves out of cell 2. Water moves into cell 3. No net water movement

+ Water moves out Hypertonic The cell shrinks

+ Hypertonic Hyper- = over High concentration outside cell, but can’t diffuse circles through membrane, so… INSIDE CELL OUTSIDE CELL

+ Hypertonic … move water through membrane to the outside of cell Cell will SHRINK INSIDE CELL OUTSIDE CELL

+ Water moves in Hypotonic The cell swells

+ Hypotonic Hypo- = under High concentration inside cell, but can’t diffuse circles through membrane, so… INSIDE CELL OUTSIDE CELL

+ Hypotonic … move water through membrane into the cell INSIDE CELL OUTSIDE CELL Cell will swell and BURST

+ No Net Movement Isotonic Amount of water moved into cell equals the amount of water moved out of cell

+ Isotonic Iso- = equal Equal concentration inside and outside the cell INSIDE CELL OUTSIDE CELL

+ Osmosis Practice If a cell’s cytoplasm contains 30% solute, how you describe the rest of the cytoplasm? If you place that cell in a 50% solute solution, what will happen to the cell

+ Osmosis Practice Inside a cell, it has a 50% solute concentration. It is placed in a 20% solute solution. What will happen to this cell?

+ Osmosis Practice A 0.9% NaCl solution is isotonic to red blood cells. What will happen if red blood cells are placed in a 9% solution of NaCl?

+ Osmosis Practice The U-shaped tube in the figure below is divided by a membrane that is impermeable to starch but is permeable to water. What would occur?

+ Day 2 of Grape Osmosis Lab

+ Unit 3 Bellwork (11/5/14) What are the two parts that make up the cell membrane? Potassium (K + ) is a charged ion. Can this diffuse across the cell membrane? Swiftamine is a large protein that is produced by the thyroid when you start listening to Taylor Swift. Can this molecule diffuse across the cell membrane?

+ Bellwork (11/7/14) What are the two characteristics of PASSIVE transport? What is another name for the cell membrane? What will happen if an animal cell has a water concentration of 87% and is placed in a 5% salt water solution? How will water move? What will happen to the cell size? What type of solution is this?

+ Bellwork (11/12) Can these diffuse across the cell membrane? Potassium (K + ) is a charged ion. Swiftamine is a large protein that is produced by the thyroid when you start listening to Taylor Swift. What are the 2 traits of PASSIVE transport? What will happen if an animal cell has a water concentration of 87% and is placed in a 5% salt water solution? How will water move? What will happen to the cell size? What type of solution is this?

+ Osmosis Summary Type of solution The fluid outside the cell has… Water diffuses… Effect on cell… Hypertonic Hypotonic Isotonic

+ Osmosis Summary Type of solution The fluid outside the cell has… Water diffuses… Effect on cell… HypertonicA higher concentration of solute Out of the cellCell shrinks HypotonicA lower concentration of solute Into the cellCell swells IsotonicEqual concentration of solute Into and out of cell at equal rates Cell stays the same size

+ Drawings for Lab

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+ Osmosis Worksheet Pass out

+ Facilitated Diffusion Facilitated diffusion: passive transport does not require energy Movement down concentration gradient Facilitated = helped

+ Facilitated Diffusion Facilitated = helped LARGE AND IN CHARGE molecules cannot diffuse through the membrane, but can move through with a use of a protein

+ Facilitated Diffusion

+ Passive Transport Diffusion Movement from a high concentration to a low concentration (down conc. gradient) Osmosis Diffusion of water through a membrane down concentration gradient Facilitated Diffusion Protein helps movement through a membrane down concentration gradient

+ Active Transport So passive transport is… NO energy Down the concentration gradient So, Active Transport: Movement across the cell membrane against the concentration gradient Low conc. to a high conc. Requires energy!

+ Active Transport Protein needed

+ Cell Transport Summary So passive transport is… NO energy Down the concentration gradient High conc. to a low conc. Diffusion, osmosis, facilitated diffusion So, Active Transport: Movement across the cell membrane against the concentration gradient Low conc. to a high conc. Requires energy! (protein)

+ Cell Transport Wkst Pass out

+ Bellwork (11/13) What is the difference between passive and active transport? What is the difference between diffusion and osmosis? What is the difference between diffusion and facilitated diffusion?

+ Today … You need to finish this by 1:40pm  Osmosis Practice (10 pts)  Cell Transport WS (10 pts)  Unit 3 Vocab (look on board!)  Study for Cell Tra nsport Quiz!  25 points