Chapter 04 Movement of Molecules Across Cell Membranes

Chapter 04 Movement of Molecules Across Cell Membranes

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

Multiple Choice Questions

1. Which of the following statements regarding the structure and function of cell membranes is correct?
   A. The phospholipid bilayer is arranged so that the hydrophilic heads of the phospholipid molecule face the extra- and intracellular fluids
   B.  Some proteins integrated into the membrane serve as channels for the passage of nonpolar molecules through the membrane
   C.  Some proteins integrated into the membrane function as channels associated with transport of ions through the membrane
   D.  Both the phospholipid bilayer is arranged so that the hydrophilic heads of the phospholipid molecule face the extra- and intracellular fluids and some proteins integrated into the membrane function as channels associated with transport of ions through the membrane are correct
   E.  All of the choices are correct

Bloom’s Level: 1. Remember
Section 4.01
Topic: Cells
 

2. Diffusion
   A.Depends upon the random motion of molecules
   B. Results in net movement of molecules from regions of low concentration to regions of high concentration
   C. Is important for moving molecules over large distances in the body
   D. Requires energy in the form of ATP to be carried out
   E. Includes all of the choices

Bloom’s Level: 1. Remember
Section 4.01
Topic: Chemistry
 

3. When a solute, X, is placed in compartment A of a two compartment container and allowed to diffuse to compartment B and attain diffusion equilibrium, then
   A.There will no longer be any movement of solutes between compartments
   B. Solutes will be moving in both directions equally
   C. Solutes will only continue to move from A to B
   D. Solutes will only continue to move from B to A
   E. Solutes will continue to move to the side with the higher concentration

Bloom’s Level: 1. Remember
Section 4.01
Topic: Chemistry
 

4. Which of the following statements regarding the diffusion of nonpolar solutes across cell membranes is correct?
   A.At equilibrium for solute X, the flux of X across cell membranes is zero
   B. At equilibrium for solute X, the net flux of X across cell membranes is zero
   C. At equilibrium for solute X, the concentration of X inside the cell is equal to its concentration outside the cell
   D. Both at equilibrium for solute X, the flux of X across cell membranes is zero and at equilibrium for solute X, the concentration of X inside the cell is equal to its concentration outside the cell are correct
   E. Both at equilibrium for solute X, the net flux of X across cell membranes is zero and at equilibrium for solute X, the concentration of X inside the cell is equal to its concentration outside the cell are correct

Bloom’s Level: 2. Understand
Section 4.01
Topic: Cells
 

5. The net flux of a penetrating solute into a cell will increase if the
   A.Permeability constant for that solute increases
   B. Temperature increases
   C. Concentration of that solute in the extracellular fluid increases
   D. Both permeability constant for that solute increases and concentration of that solute in the extracellular fluid increases are correct
   E. All of the choices are correct

Bloom’s Level: 1. Remember
Section 4.01
Topic: Cells