Lecture 22

Question 1

Non-mediated

Answer 1

• Does not directly use a transport protein

Question 2

Mediated

Answer 2

• Requires transport proteins

Question 3

Importance of non-mediated diffusion through the bilayer

Answer 3

• Absorption of nutrients
• Excretion of waste
• Passive movement

Question 4

Ion channels structure

Answer 4

• water filled pores that span the hydrophobic core of the lipid bilayer allow passage of ion molecules

Question 5

What lines the channel proteins

Answer 5

• Amino acids line in the pore

Question 6

Passive transport

Answer 6

• Move substances down the concentration or electrochemical gradient with only their kinetic energy

Question 7

Active transport

Answer 7

• Uses energy to drive substances against their concentration or electrochemical gradient

Question 8

Different stimuli can control opening and closing of gated pores

Answer 8

• voltage gated
• Ligand binding
• volume of Cell
• pH
• Phosphorylation

Question 9

Current flow can be measured or recorded by

Answer 9

• The patch clamp technique

Question 10

Carrier mediated transport exhibit

Answer 10

• specificity
• inhibition
• competition
• saturation