Practical 5

Question 1

Passive diffusion

Answer 1

Small, hydrophobic molecules move down concentration gradient and cross membrane unaided.
Rate of transport is dependent on permeability

Question 2

What sort of molecules are more permeable to the membrane

Answer 2

Small, uncharged molecules

Question 3

Facilitated diffusion

Answer 3

Large polar molecules cross membrane in thermodynamically favored direction facilitated by proteins

Question 4

Active transport

Answer 4

Uphill transport that requires energy input. Movement against concentration gradient.

Question 5

Secondary active transport

Answer 5

Downhill transport of ions is coupled to uphill transport of another solute