How things cross membranes - lots of data analysis and experiment questions.

Diffusion, Active Transport, Osmosis and Facilitated Diffusion.

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TIPS

• Can you explain how the phospholipid bilayer stops the diffusion of water soluble compounds ?

• Water potential is measured in kPA - a unit of pressure. So water moves to a lower water potential.

• Can you define water potential ?

• Facilitated means helped or assisted

• the cellulose cell wall is permeable - but resists the expansion of the cytoplasm, therefore preventing osmotic lysis

• Diffusion is moving from where there are lots to where there are few. Moving the opposite way needs energy