Membrane channel proteins serve many important transport fun

Membrane channel proteins serve many important transport functions, yet they are limited in their functionality because they

Question 4 options: I chose D but it was wrong

a. cannot transport charged solutes.

b. cannot transport solutes against their concentration gradients.

c. cannot be voltage-gated.

d. cannot be ligand-gated

e. cannot transport solutes as fast as other transporters.

If the permeability of a membrane to (magnesium) Mg++ increased by a factor of two, but the intracellular and extracellular Mg++ concentrations remained unchanged, what would you predict the equilibrium potential for Mg++ to be relative to the starting condition?

Question 7 options:

a. The equilibrium potential would remain unchanged.

b. The equilibrium potential would increase by some unknown amount.

c. The equilibrium potential would decrease by some unknown amount.

d. The equilibrium potential would increase by 2.

e. The equilibrium potential would decrease by 2.

If the number or the activity of only one transporter in Fig. 1 was changed so as to make the resting membrane potential more negative inside relative to outside, the change would logically be to

Question 8 options:

a. increase the number or activity of transporter A

b. increase the number or activity of transporter B

c. decrease the number or activity of transporter C

d. increase the number or activity of transporter D

e. increase the number or activity of transporter E

Solution

4). a. cannot transport charged solutes.

7). a. The equilibrium potential would remain unchanged