Extra Credit: Amoeba Sisters Video Recap Tuesday February 21, 2017 I can: understand how the cell membrane allows for passive transport Agenda (10) Catalyst (15) Kahoot (20) GN: Cell Membrane and Transport (20) Amoeba Sisters Video (15) IP: Diffusion (5) Exit Ticket Catalyst What are the 4 classes of biomolecules? What is the monomer of a lipid? What is the function of a carbohydrate? What is the function of a nucleic acid? HW: Diffusion IP; Extra Credit: Amoeba Sisters Video Recap

Reminder! Test corrections due THURSDAY! Biomolecules & Cell Membrane quiz FRIDAY

What boundary separates one country from another? Borders separate one country from another.

All cells are surrounded by a thin, flexible boundary known as the cell membrane that separates it from its surroundings.

Cell Membrane How does the cell membrane regulate the contents of the cell? The cell membrane regulates what enters and leaves the cell. made up of a phospholipid bilayer protein channels and carbohydrate “ID tags” are embedded in the bilayer = two layers of phospholipids

Concentration Concentration refers to the “crowdedness” of an area. low concentration high concentration

Equilibrium When the concentration of a substance is the same throughout the area, it has reached equilibrium. The dye concentration has reached equilibrium.

Brownian Motion Particles in a liquid are moving constantly in random directions.

aka moving down a concentration gradient Diffusion Particles move from an area where they are more concentrated to where they are less concentrated until equilibrium is reached. This process is called diffusion. Because it results from random motion, it does not require energy. aka moving down a concentration gradient

Diffusion Does this process require energy? high concentration low concentration Molecules start diffusing throughout the liquid… …until equilibrium is reached. Does this process require energy?

Draw on your board: How will the molecules move Draw on your board: How will the molecules move? What process is this called?

Draw on your board: How will the molecules move Draw on your board: How will the molecules move? What process is this called?

Write on your board: In which direction will the molecules move?

Write on your board: In which direction will the molecules move?

Write on your board: In which direction will the molecules move?

Write on your board: In which direction will the molecules move?

Write on your board: In which direction will the molecules move?

Write on your board: In which direction will the molecules move?

Draw on your board: What will the beaker look like in 10 minutes?

Draw on your board: What will the beaker look like in 10 minutes?

Draw on your board: What direction will the molecules move in? 80% salt cell 20% salt

Draw on your board: What direction will the molecules move in? 80% salt cell 20% salt

Draw on your board: What direction will the molecules move in? 25% salt cell 20% salt

Draw on your board: What direction will the molecules move in? 25% salt cell 20% salt

Draw on your board: What direction will the molecules move in? 25% salt cell 60% salt

Draw on your board: What direction will the molecules move in? 25% salt cell 60% salt

Draw on your board: What direction will the molecules move in? 60% salt cell 60% salt

Draw on your board: What direction will the molecules move in? 60% salt cell 60% salt

Selective Permeability permeable = lets things pass through impermeable = does not let substance pass selectively permeable = allows certain things to pass through The cell membrane is selectively permeable.

The cell membrane is impermeable to large molecules like glucose.

What happens when a membrane is impermeable to a substance but not to water? Osmosis!

low concentration of H2O high concentration of H2O Osmosis Water moves from high to low concentration of water until equilibrium is reached. Osmosis is the diffusion of water. does not require energy low concentration of H2O high concentration of H2O

Which way will the water move?

Which way will the water move?

Which way will the water move? other solute

Which way will the water move?

Which way will the water move? *the membrane is impermeable to salt* 80% salt cell 20% salt

Which way will the water move? *the membrane is impermeable to salt* 80% salt = 20% water cell 20% salt = 80% water

Which way will the water move? 25% salt cell 20% salt

Which way will the water move? 25% salt cell 20% salt

Which way will the water move? 25% salt cell 60% salt

Which way will the water move? 25% salt cell 60% salt

Amoeba Sisters https://www.youtube.com/watch?v=IaZ8MtF3C6M