Question 1

Which of the following molecules is most likely to cross a cell membrane by simple diffusion?

Accepted Answer

O2

Question 2

A red blood cell is placed in a hypotonic solution. Which process will occur to restore equilibrium?

Accepted Answer

Osmosis of water into the cell

Question 3

Which equation correctly describes the free energy change ($$\Delta G) $$for the transport of an uncharged solute across a membrane?

Accepted Answer

$$\Delta G = RT \ln \left( \frac{[S]_{inside}}{[S]_{outside}} \right)$$

Question 4

Which of the following statements about facilitated diffusion is TRUE?

Accepted Answer

It involves specific transport proteins

Question 5

The Na+/K+ pump is an example of which type of transport?

Accepted Answer

Active transport

Question 6

Which of the following best describes the function of aquaporins in a cell membrane?

Accepted Answer

Facilitate the rapid movement of water

Question 7

A carrier protein that transports two solutes in opposite directions across a membrane is called:

Accepted Answer

Antiporter

Question 8

Which of the following is a property of active transport but NOT of facilitated diffusion?

Accepted Answer

Requires metabolic energy

Question 9

The partition coefficient ($$K_{PC}) is $$used to predict:

Accepted Answer

The permeability of a compound through the lipid bilayer

Question 10

Which of the following is TRUE regarding the energetics of solute transport?

Accepted Answer

If $$\Delta G = 0$$, there is no net movement of solute

Question 11

Which equation describes the free energy change ($$\Delta G) $$for the transport of a charged solute across a membrane?

Accepted Answer

$$\Delta G = RT \ln \left( \frac{[S]_{inside}}{[S]_{outside}} \right) + zFV_m$$

Question 12

Which of the following is an example of indirect active transport?

Accepted Answer

Na+/glucose symporter

Question 13

In Halobacterium, what is the source of energy for active transport of protons?

Accepted Answer

Light energy

Question 14

Which of the following statements about the Na+/K+ pump is CORRECT?

Accepted Answer

It moves sodium out and potassium in, both against their gradients

Question 15

Which transport process is most likely to be inhibited by a competitive inhibitor?

Accepted Answer

Facilitated diffusion

Question 16

Which of the following is NOT a property of simple diffusion?

Accepted Answer

Requires a membrane protein

Question 17

A cell needs to import a large polar molecule against its concentration gradient. Which transport mechanism will it most likely use?

Accepted Answer

Active transport

Question 18

Which of the following is TRUE about the directionality of transport in facilitated diffusion?

Accepted Answer

It moves solutes down their concentration gradient

Question 19

Which of the following is a real-life example of antiport transport in human cells?

Accepted Answer

Anion exchange protein transporting Cl- and HCO3-

Question 20

Which property distinguishes facilitated diffusion from simple diffusion?

Accepted Answer

Facilitated diffusion requires a membrane protein

Ch 8 - Transport Across Membranes: Overcoming the Permeability Barrier

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