Question 1

OTHER
  
The following seven questions are associated with the accompanying figure (above) of the plasma membrane.
-Which structure contributes to both the fluidity and stability of the membrane?

Accepted Answer

The answer of OTHER
  
The following seven questions are...

Question 2

Assume that a membrane that is permeable to Na+ but not to Cl- separates two solutions. The concentration of sodium chloride on side 1 is much higher than on side 2. Which of the following ionic movements will take place?

Accepted Answer

A)  Na+ will move until its concentration gradient is dissipated (i.e., until the concentration of Na+ on side 2 is the same as the concentration of Na+ on side 1). 
B)  Cl- will move down its concentration gradient from side 1 to side 2. 
C)  a membrane potential, negative on side 1, will develop. 
D)  a membrane potential, positive on side 1, will develop. 
E)  more than one of these answers.

Question 3

The model of the plasma membrane as a lipid bilayer studded and penetrated by proteins is known as the ____________________ model of membrane structure.

Accepted Answer

The answer of The model of the plasma membrane as...

Question 4

Pinocytosis refers to the process of a cell engulfing a large, multimolecular particle and bringing the particle within the contents of the cell.

Accepted Answer

A) True 
 B)False

Question 5

Indicate which constituent of the plasma membrane is responsible for performing the function in question by filling in the appropriate blank using the answer code below.
-Important in the aggregation of cells to form tissues.

Accepted Answer

A) protein 
B) carbohydrate 
C) lipid bilayer

Question 6

Which term is associated with transport maximum (Tm) of a carrier?

Accepted Answer

A)  specificity 
B)  saturation 
C)  competition 
D)  passive diffusion 
E)  leak channels

Question 7

Which of the following is incorrect about water movement across the membrane?

Accepted Answer

A)  water can only move across the membrane through water channels 
B)  the movement of water is referred to as osmosis 
C)  water can slip between and pass through phospholipid molecules 
D)  water channels are known as aquaporins 
E)  water tends to be attracted to an area with a higher solute concentration

Question 8

____________________ diffusion allows materials to pass through a carrier protein without the expenditure of energy.

Accepted Answer

The answer of ____________________ diffusion allows materials to pass through...

Question 9

Which of the following statements concerning the Na+-K+ pump is incorrect?

Accepted Answer

A)  the phosphorylated conformation of the Na+-K+ pump has high affinity for K+ when exposed to the ICF. 
B)  the Na+-K+ pump has ATPase activity. 
C)  the Na+-K+ pump establishes Na+ and K+ concentration gradients across the plasma membrane; these gradients are critically important in the ability of nerve and muscle cells to generate electrical impulses essential to their functioning. 
D)  the Na+-K+ pump helps regulate cell volume by controlling the concentration of solutes inside the cell to minimize osmotic effects that would induce swelling or shrinking of the cell. 
E)  the ion concentration gradient established by the Na+-K+ pump drives cotransport carriers to move glucose against its concentration gradient across intestinal and kidney cells.

Question 10

Indicate which constituent of the plasma membrane is responsible for performing the function in question by filling in the appropriate blank using the answer code below.
-Serves as carrier to transport particles across the membrane.

Accepted Answer

A) protein 
B) carbohydrate 
C) lipid bilayer

Question 11

The direct actions of the sodium-potassium pump contribute to the majority of the generation of the resting membrane potential.

Accepted Answer

A) True 
 B)False

Question 12

OTHER
  
The following seven questions are associated with the accompanying figure (above) of the plasma membrane.
-Which structure protrudes like antennas from the cell surface?

Accepted Answer

The answer of OTHER
  
The following seven questions are...

Question 13

Indicate the various roles of the following ions:
-ion whose equilibrium potential is opposite in charge of the resting membrane potential

Accepted Answer

A) Na+ 
B) K+ 
C) A- 
D) Cl-

Question 14

The SGLT transporter is a glucose-sodium cotransport system.

Accepted Answer

A) True 
 B)False

Question 15

Surface foldings along the membranes of the small intestine increase the ____________________ for absorption.

Accepted Answer

The answer of Surface foldings along the membranes of the...

Question 16

Indicate the various roles of the following ions:
-on that is actively transported out of the cell

Accepted Answer

A) Na+ 
B) K+ 
C) A- 
D) Cl-

Question 17

The three characteristics that determine the kind and amount of material that can be moved across a membrane by carrier-mediated transport are ____________________, ____________________, and ____________________.

Accepted Answer

The answer of The three characteristics that determine the kind...

Question 18

Exocytosis of secretory products is triggered by the entry of ____ into the cell in response to a specific neural or hormonal stimulus.

Accepted Answer

A)  K+ 
B)  Na+ 
C)  Ca2+ 
D)  ATP 
E)  A-

Question 19

Integrins

Accepted Answer

A)  create a filamentous meshwork in the inner surface of the membrane. 
B)  act as membrane-bounded enzymes. 
C)  are used for cell recognition purposes. 
D)  span the membrane, providing a mechanical link between the outer membrane and the cell's surrounding. 
E)  none of these answers.

Question 20

The plasma membrane

Accepted Answer

A)  is composed primarily of phospholipids and proteins arranged in a fluid mosaic structure. 
B)  has a trilaminar appearance under an electron microscope. 
C)  acts as a mechanical barrier. 
D)  all of these answers. 
E)  none of these answers.

Exam 3: The Plasma Membrane and Membrane Potential

OTHER The following seven questions are associated with the accompanying figure (above) of the plasma membrane. -Which structure contributes to both the fluidity and stability of the membrane?

Assume that a membrane that is permeable to Na⁺ but not to Cl^- separates two solutions. The concentration of sodium chloride on side 1 is much higher than on side 2. Which of the following ionic movements will take place?

The model of the plasma membrane as a lipid bilayer studded and penetrated by proteins is known as the ____________________ model of membrane structure.

Pinocytosis refers to the process of a cell engulfing a large, multimolecular particle and bringing the particle within the contents of the cell.

Indicate which constituent of the plasma membrane is responsible for performing the function in question by filling in the appropriate blank using the answer code below. -Important in the aggregation of cells to form tissues.

Which term is associated with transport maximum (Tm) of a carrier?

Which of the following is incorrect about water movement across the membrane?

____________________ diffusion allows materials to pass through a carrier protein without the expenditure of energy.

Which of the following statements concerning the Na⁺-K⁺ pump is incorrect?

Indicate which constituent of the plasma membrane is responsible for performing the function in question by filling in the appropriate blank using the answer code below. -Serves as carrier to transport particles across the membrane.

The direct actions of the sodium-potassium pump contribute to the majority of the generation of the resting membrane potential.

OTHER The following seven questions are associated with the accompanying figure (above) of the plasma membrane. -Which structure protrudes like antennas from the cell surface?

Indicate the various roles of the following ions: -ion whose equilibrium potential is opposite in charge of the resting membrane potential

The SGLT transporter is a glucose-sodium cotransport system.

Surface foldings along the membranes of the small intestine increase the ____________________ for absorption.

Indicate the various roles of the following ions: -on that is actively transported out of the cell

The three characteristics that determine the kind and amount of material that can be moved across a membrane by carrier-mediated transport are , , and .

Exocytosis of secretory products is triggered by the entry of ____ into the cell in response to a specific neural or hormonal stimulus.

Integrins

The plasma membrane