How things cross membranes - resources and exam questions (lots of application and data analysis)

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

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  • 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