3.2 Passive Transport

Question 1

Order to disorder is ___, while the reverse requires ____

Answer 1

spontaneous, energy

Question 2

Brownian movement

Answer 2

molecules in solution remain in motion unless frozen

Question 3

Increase in conc. or temp. means

Answer 3

Increase diffusion (increase brownian movement and dispersement)

Question 4

Two categories of movement across membrane:

Answer 4

• passive transport
• active transport (requires energy)

Question 5

Passive transport examples

Answer 5

• simple diffusion (small/non polar)
• simple diffusion w/pore (ions)
• osmosis (net diffus. movement of water)
• facilitated diffusion (escorted one at a time by carrier/transport protein)

Question 6

Active transport examples:

Answer 6

• primary active transport (usually against gradient, walking uphill, requires ATP)
• secondary active transport (energy of primary sets up gradient for other things into the cell)
• Endocytosis & exocytosis (receptor mediated, bulk movement)

Question 7

Diffusion is

Answer 7

Movement of molecules due to kinetic (internal) energy

Question 8

Net diffusion

Answer 8

• movement from high to low conc.
• until equilibrium is reached
• movement does not stop at equilibrium

Question 9

Simple diffusion (passive) examples

Answer 9

• small lipid soluble molecules move across
• Oxygen & CO2 go through by conc. gradient
• ions and water moving through pores of integral membrane protein

Question 10

Facilitated diffusion (passive process)

Answer 10

• Requires that a substance bind to a specific protein that then carries across
• movement of glucose