Question 1

Indicate whether the force in question tends to move the involved ion in or out of the cell by filling in the blank using the following answer code.
-electrical gradient for Na+ at resting potential

Accepted Answer

A) Ion tends to be moved into the cell by this force. 
B) Ion tends to be moved out of the cell by this force.

Question 2

Select the incorrect statement about the plasma membrane.

Accepted Answer

A)  cholesterol contributes to its stability. 
B)  membrane proteins are inserted in a lipid bilayer. 
C)  it consists mostly of proteins. 
D)  its lipid bilayer is not a rigid structure. 
E)  membrane carbohydrates are only on its outer surface.

Question 3

Indicate the various roles of the following ions:
-cation in greatest concentration in the ECF

Accepted Answer

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

Question 4

A first messenger is an intracellular chemical messenger that triggers a preprogrammed series of biochemical events within a cell to bring about a desired response.

Accepted Answer

A) True 
 B)False

Question 5

The hydrophobic interior of the lipid bilayer of the plasma membrane blocks the passage of water-soluble substances.

Accepted Answer

A) True 
 B)False

Question 6

The only means by which an extracellular chemical messenger can bring about a desired intracellular response is to activate a second messenger system.

Accepted Answer

A) True 
 B)False

Question 7

Carrier molecules always require energy to accomplish transport of a substance across the membrane.

Accepted Answer

A) True 
 B)False

Question 8

Indicate the various roles of the following ions:
-cation to which the membrane is most permeable under resting conditions

Accepted Answer

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

Question 9

Indicate which characteristic of a mediated-transport system is referred to in each item by filling in the blank using the following answer code:
-If a carrier can handle substance X but not substance Y, what characteristic is being exemplified?

Accepted Answer

A) specificity 
B) saturation 
C) competition

Question 10

Carrier-mediated transport

Accepted Answer

A)  involves a specific membrane protein that serves as a carrier molecule. 
B)  always moves substances against a concentration gradient. 
C)  always requires energy expenditure. 
D)  two of these answers. 
E)  all of these answers.

Question 11

According to Fick's law of diffusion, which of the following changes would decrease the rate of net diffusion of a substance across a membrane?

Accepted Answer

A)  an increase in the substance's concentration gradient 
B)  an increase in the permeability of the membrane to the substance 
C)  an increase in the surface area of the membrane 
D)  an increase in the thickness of the membrane 
E)  none of these answers.

Question 12

Indicate the various roles of the following ions:
-anion in greatest concentration in the ICF

Accepted Answer

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

Question 13

At the equilibrium potential for K+, the concentration an electrical gradients for K+ are in opposition to each other an exactly balance each other so there is no net movement of K+.

Accepted Answer

A) True 
 B)False

Question 14

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.
-Acts as a barrier to water soluble substances.

Accepted Answer

A) protein 
B) carbohydrate 
C) lipid bilayer

Question 15

Select the correct statement about diffusion.

Accepted Answer

A)  it depends on the random motion 
B)  it involves active forces. 
C)  its rate increases as the temperature decreases. 
D)  molecules move from a lower concentration to a higher concentration. 
E)  the chemical gradient of a substance does not affect it.

Question 16

OTHER
  
The following seven questions are associated with the accompanying figure (above) of the plasma membrane.
-Which structure permit unregulated passage of their selected ion?

Accepted Answer

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

Question 17

Refer to the accompanying diagram to match the following ions with the statements below. Answers may be used more than once
-Equilibrium potential contributes the most to resting membrane potential.

Accepted Answer

A) potassium 
B) sodium 
C) chloride 
D) intracellular proteins

Question 18

List the three proteins of the extracellular matrix and state their function.

Accepted Answer

The answer of List the three proteins of the extracellular...

Question 19

Which of the following are common means by which binding of an extracellular chemical messenger with a cell's receptor brings about a desired intracellular response?

Accepted Answer

A)  opening or closing of specific channels to regulate ionic movement across the plasma membrane. 
B)  activation of an intracellular second messenger system. 
C)  alteration of protein shape and function as a result of phosphorylation. 
D)  only (a) and (b) above. 
E)  all of these answers.

Question 20

Membrane potential

Accepted Answer

A)  refers to a separation of charges across the membrane or to a difference in the relative number of + and - charges in the ECF and ICF. 
B)  is measured in units of millivolts with the sign always designating the charge on the outside. 
C)  is less at the equilibrium potential for K+ than at resting membrane potential. 
D)  cannot be measured easily. 
E)  all of these answers.

Exam 3: The Plasma Membrane and Membrane Potential

Indicate whether the force in question tends to move the involved ion in or out of the cell by filling in the blank using the following answer code. -electrical gradient for Na⁺ at resting potential

Select the incorrect statement about the plasma membrane.

Indicate the various roles of the following ions: -cation in greatest concentration in the ECF

A first messenger is an intracellular chemical messenger that triggers a preprogrammed series of biochemical events within a cell to bring about a desired response.

The hydrophobic interior of the lipid bilayer of the plasma membrane blocks the passage of water-soluble substances.

The only means by which an extracellular chemical messenger can bring about a desired intracellular response is to activate a second messenger system.

Carrier molecules always require energy to accomplish transport of a substance across the membrane.

Indicate the various roles of the following ions: -cation to which the membrane is most permeable under resting conditions

Indicate which characteristic of a mediated-transport system is referred to in each item by filling in the blank using the following answer code: -If a carrier can handle substance X but not substance Y, what characteristic is being exemplified?

Carrier-mediated transport

According to Fick's law of diffusion, which of the following changes would decrease the rate of net diffusion of a substance across a membrane?

Indicate the various roles of the following ions: -anion in greatest concentration in the ICF

At the equilibrium potential for K⁺, the concentration an electrical gradients for K⁺ are in opposition to each other an exactly balance each other so there is no net movement of K⁺.

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. -Acts as a barrier to water soluble substances.

Select the correct statement about diffusion.

OTHER The following seven questions are associated with the accompanying figure (above) of the plasma membrane. -Which structure permit unregulated passage of their selected ion?

Refer to the accompanying diagram to match the following ions with the statements below. Answers may be used more than once -Equilibrium potential contributes the most to resting membrane potential.

List the three proteins of the extracellular matrix and state their function.

Which of the following are common means by which binding of an extracellular chemical messenger with a cell's receptor brings about a desired intracellular response?

Membrane potential

Exam 3: The Plasma Membrane and Membrane Potential

Indicate whether the force in question tends to move the involved ion in or out of the cell by filling in the blank using the following answer code. -electrical gradient for Na+ at resting potential

Select the incorrect statement about the plasma membrane.

Indicate the various roles of the following ions: -cation in greatest concentration in the ECF

A first messenger is an intracellular chemical messenger that triggers a preprogrammed series of biochemical events within a cell to bring about a desired response.

The hydrophobic interior of the lipid bilayer of the plasma membrane blocks the passage of water-soluble substances.

The only means by which an extracellular chemical messenger can bring about a desired intracellular response is to activate a second messenger system.

Carrier molecules always require energy to accomplish transport of a substance across the membrane.

Indicate the various roles of the following ions: -cation to which the membrane is most permeable under resting conditions

Indicate which characteristic of a mediated-transport system is referred to in each item by filling in the blank using the following answer code: -If a carrier can handle substance X but not substance Y, what characteristic is being exemplified?

Carrier-mediated transport

According to Fick's law of diffusion, which of the following changes would decrease the rate of net diffusion of a substance across a membrane?

Indicate the various roles of the following ions: -anion in greatest concentration in the ICF

At the equilibrium potential for K+, the concentration an electrical gradients for K+ are in opposition to each other an exactly balance each other so there is no net movement of K+.

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. -Acts as a barrier to water soluble substances.

Select the correct statement about diffusion.

OTHER The following seven questions are associated with the accompanying figure (above) of the plasma membrane. -Which structure permit unregulated passage of their selected ion?

Refer to the accompanying diagram to match the following ions with the statements below. Answers may be used more than once -Equilibrium potential contributes the most to resting membrane potential.

List the three proteins of the extracellular matrix and state their function.

Which of the following are common means by which binding of an extracellular chemical messenger with a cell's receptor brings about a desired intracellular response?

Membrane potential

Indicate whether the force in question tends to move the involved ion in or out of the cell by filling in the blank using the following answer code. -electrical gradient for Na⁺ at resting potential

At the equilibrium potential for K⁺, the concentration an electrical gradients for K⁺ are in opposition to each other an exactly balance each other so there is no net movement of K⁺.