PS 3.1 Plot and interpret graphs 6 Movement across the cell Define and describe the passive 3.2.3 Transport across cell 6.2 membrane: facilitated diffusion facilitated diffusion across the membranes cell membrane Students define facilitated Movement across membranes diffusion and give examples of Explain the factors that can occurs by: molecules that move across affect the rate of transport the cell membrane this way. They across the cell membrane facilitated diffusion (involving should be able to draw annotated the roles of carrier proteins diagrams showing the process. Illustrate graphically and channel proteins). Factors affecting the rate of movement across a cell movement should be identified. membrane by facilitated Ensure Students recognise both diffusion diffusion and facilitated diffusion are passive processed dependent on concentration gradients. Students could draw and explain graphs showing facilitated diffusion with concentration of substance on the x-axis and rate of diffusion on the y-axis. 7 Movement across the cell Define osmosis in of 3.2.3 Transport across cell 6.3 membrane: osmosis water potential and explain membranes what an aquaporin is Osmosis can be demonstrated by Give the units for water Movement across membranes putting a jelly baby in water. potential and identify what occurs by: Students can recall prior happens to water potential knowledge of water and osmosis when solute concentration osmosis (explained in terms of and add to this by defining osmosis changes water potential) in terms of water potential. Predict the net direction of Students can predict the the movement of water using movement of water between cells water potential and explain based on given values for water the consequences for cells potential. In small groups students can predict the consequences to animal and plant cells when placed
PS 3.1 Plot and interpret graphs 6 Movement across the cell membrane: facilitated diffusion Students define facilitated diffusion and give examples of molecules that move across the cell membrane this way. They should be able to draw annotated diagrams showing the process. Factors affecting the rate of movement should be identified. Ensure Students recognise both diffusion and facilitated diffusion are passive processed dependent on concentration gradients. Students could draw and explain graphs showing facilitated diffusion with concentration of substance on the x-axis and rate of diffusion on the y-axis. Define and describe the passive facilitated diffusion across the cell membrane Explain the factors that can affect the rate of transport across the cell membrane Illustrate graphically movement across a cell membrane by facilitated diffusion 3.2.3 Transport across cell membranes Movement across membranes occurs by: facilitated diffusion (involving the roles of carrier proteins and channel proteins). 6.2 7 Movement across the cell membrane: osmosis Osmosis can be demonstrated by putting a jelly baby in water. Students can recall prior knowledge of water and osmosis and add to this by defining osmosis in terms of water potential. Students can predict the movement of water between cells based on given values for water potential. In small groups students can predict the consequences to animal and plant cells when placed Define osmosis in of water potential and explain what an aquaporin is Give the units for water potential and identify what happens to water potential when solute concentration changes Predict the net direction of the movement of water using water potential and explain the consequences for cells 3.2.3 Transport across cell membranes Movement across membranes occurs by: osmosis (explained in terms of water potential) 6.3