3.2 - Passive Transport

Question 1

Carrier Proteins

Answer 1

Change shape to allow molecule passage; e.g., glucose transporters.

Question 2

Channel Proteins

Answer 2

Specific; can be open or triggered; e.g., Na+ or Cl- ions.

Question 3

Concentration Gradient

Answer 3

Difference in molecule concentration between regions, driving diffusion.

Question 4

Diffusion

Answer 4

Random movement of molecules from high to low concentration regions.

Question 5

Diffusion of Non-Electrolytes

Answer 5

Small, uncharged, and lipophilic molecules diffuse through lipid bilayer.

Question 6

Equilibrium

Answer 6

State when concentrations are equal, halting diffusion.

Question 7

Facilitated Diffusion

Answer 7

Molecules needing help from transport proteins to enter cell.

Question 8

Lipid Bilayer

Answer 8

Cell membrane with a non-polar interior that lets non-polar molecules pass more easily.

Question 9

Non-Polar Molecules

Answer 9

These pass through the lipid bilayer more easily than polar molecules.

Question 10

Permeability

Answer 10

Ability of a membrane to allow molecules through.

Question 11

Selective Permeability

Answer 11

Cell membranes allow only certain molecules to pass through, based on their properties.

Question 12

Size and Polarity

Answer 12

Molecule’s size and polarity affect its permeability through the membrane.

Question 13

Small Molecules

Answer 13

Smaller molecules can cross the membrane more easily.

Question 14

Transport Proteins

Answer 14

Aid in facilitated diffusion, no energy needed.