factors affecting permeability

Question 1

how does an increase in temperature affect membrane permeability?

Answer 1

• lipids gain kinetic energy
• fluidity increases
• barrier strength is reduced
• polar molecules pass more easily
• the volume of water in cell increases so intermolecular forces between amino acids break and proteins deform
• faster diffusion and increased permeability

Question 2

how does an increase in solvent concentration affect membrane permeability?

Answer 2

• lipids dissolve
• structure is lost
• increased permeability