Question 1

The sodium-potassium pump moves ____ sodium ions out of the cell for every 2 potassium ions it moves into the cell.

Accepted Answer

A)  3 
B)  5 
C)  7 
D)  11 
E)  13 
A)  3 
B)  5 
C)  7 
D)  11 
E)  13

Question 2

Which of the following moves across the membrane by facilitated diffusion?

Accepted Answer

A)  oxygen 
B)  sodium 
C)  glucose 
D)  potassium 
E)  water 
A)  oxygen 
B)  sodium 
C)  glucose 
D)  potassium 
E)  water

Question 3

If a concentration or electrical gradient is present for a given substance, the substance will always passively permeate the membrane.

Accepted Answer

A) True 
 B)False

Question 4

Extracellular messengers binding on surface receptors may exert effects on cells via all the following means, except:

Accepted Answer

A)  opening gated channels. 
B)  opening a gated channel through activation of a G protein. 
C)  activation of the adenylyl cyclase system. 
D)  binding to sites and then being endocytized. 
E)  ultimately activating protein kinases. 
A)  opening gated channels. 
B)  opening a gated channel through activation of a G protein. 
C)  activation of the adenylyl cyclase system. 
D)  binding to sites and then being endocytized. 
E)  ultimately activating protein kinases.

Question 5

The resting membrane potential of a typical neuron is more negative then the equilibrium potential for potassium.

Accepted Answer

A) True 
 B)False

Question 6

____________________ are the cells that secrete the majority of the composition of the extracellular matrix.

Accepted Answer

The answer of ____________________ are the cells that secrete the...

Question 7

____________________ are connecting tunnels in gaps between adjacent cells.

Accepted Answer

The answer of ____________________ are connecting tunnels in gaps between...

Question 8

At resting membrane potential

Accepted Answer

A)  the membrane is more permeable to K+ than to Na+. 
B)  the membrane is more permeable to Na+ than to K+. 
C)  Cl- is at its equilibrium potential. 
D)  both (a) and (c) above. 
E)  both (b) and (c) above. 
A)  the membrane is more permeable to K+ than to Na+. 
B)  the membrane is more permeable to Na+ than to K+. 
C)  Cl- is at its equilibrium potential. 
D)  both (a) and (c) above. 
E)  both (b) and (c) above.

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 in the presence of substance Z there is a decreased rate of entry of substance X, what characteristic is being exemplified?

Accepted Answer

A) specificity 
B) saturation 
C) competition 
A) specificity 
B) saturation 
C) competition

Question 10

____________________ refers to a separation of opposite charges across the membrane.

Accepted Answer

The answer of ____________________ refers to a separation of opposite...

Question 11

The primary barrier to passage of water-soluble substances across the plasma membrane is the outer layer of carbohydrates.

Accepted Answer

A) True 
 B)False

Question 12

Potassium movement into cells always requires energy expenditure.

Accepted Answer

A) True 
 B)False

Question 13

In a water solution containing dissolved salt:

Accepted Answer

A)  salt is the solute 
B)  water is the solute 
C)  salt is the solvent 
D)  the solute is stationary 
E)  the solution is heterogeneous 
A)  salt is the solute 
B)  water is the solute 
C)  salt is the solvent 
D)  the solute is stationary 
E)  the solution is heterogeneous

Question 14

Phospholipids

Accepted Answer

A)  consist of a polar, hydrophilic, phosphate-bearing, head and two nonpolar hydrophobic, fatty-acid tails. 
B)  are aligned in a lipid bilayer in membranes. 
C)  serve as carrier molecules. 
D)  only (a) and (b) above. 
E)  all of these answers. 
A)  consist of a polar, hydrophilic, phosphate-bearing, head and two nonpolar hydrophobic, fatty-acid tails. 
B)  are aligned in a lipid bilayer in membranes. 
C)  serve as carrier molecules. 
D)  only (a) and (b) above. 
E)  all of these answers.

Question 15

The following questions refer to comparative concentrations, permeabilities, and potentials under various circumstances. Indicate the relationship between the two items listed in each situation by following answer code.
-A. permeability of a resting nerve cell membrane to K?
B. permeability of a resting nerve cell membrane to Na?

Accepted Answer

A) A is greater than B 
B) B is greater than A 
C) A and B are equal 
A) A is greater than B 
B) B is greater than A 
C) A and B are equal

Question 16

Which statement regarding membrane proteins is incorrect?

Accepted Answer

A)  channels are water-filled pathways. 
B)  channels maybe highly selective. 
C)  membrane proteins may catalyze specific reactions. 
D)  CAMs serve as binding sites for specific ligands. 
E)  proteins may work in conjunction with carbohydrates to provide recognition of "self." 
A)  channels are water-filled pathways. 
B)  channels maybe highly selective. 
C)  membrane proteins may catalyze specific reactions. 
D)  CAMs serve as binding sites for specific ligands. 
E)  proteins may work in conjunction with carbohydrates to provide recognition of "self."

Question 17

Indicate the various roles of the following ions:
-anion to which the membrane is impermeable

Accepted Answer

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

Question 18

Facilitated diffusion

Accepted Answer

A)  involves a carrier molecule. 
B)  requires energy expenditure. 
C)  is how water enters the cells. 
D)  both (a) and (c) above. 
E)  all of these answers. 
A)  involves a carrier molecule. 
B)  requires energy expenditure. 
C)  is how water enters the cells. 
D)  both (a) and (c) above. 
E)  all of these answers.

Question 19

With active transport, ATP energy is used in the phosphorylation-dephosphorylation cycle of the carrier.

Accepted Answer

A) True 
 B)False

Question 20

Movement of K+ into the cell requires energy expenditure, whereas movement of Na+ into the cell does not.

Accepted Answer

A) True 
 B)False

The sodium-potassium pump moves ____ sodium ions out of the cell for every 2 potassium ions it moves into the cell.

Which of the following moves across the membrane by facilitated diffusion?

If a concentration or electrical gradient is present for a given substance, the substance will always passively permeate the membrane.

Extracellular messengers binding on surface receptors may exert effects on cells via all the following means, except:

The resting membrane potential of a typical neuron is more negative then the equilibrium potential for potassium.

____________________ are the cells that secrete the majority of the composition of the extracellular matrix.

____________________ are connecting tunnels in gaps between adjacent cells.

At resting membrane potential

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 in the presence of substance Z there is a decreased rate of entry of substance X, what characteristic is being exemplified?

____________________ refers to a separation of opposite charges across the membrane.

The primary barrier to passage of water-soluble substances across the plasma membrane is the outer layer of carbohydrates.

Potassium movement into cells always requires energy expenditure.

In a water solution containing dissolved salt:

Phospholipids

Which statement regarding membrane proteins is incorrect?

Indicate the various roles of the following ions: -anion to which the membrane is impermeable

Facilitated diffusion

With active transport, ATP energy is used in the phosphorylation-dephosphorylation cycle of the carrier.

Movement of K⁺ into the cell requires energy expenditure, whereas movement of Na⁺ into the cell does not.

Introduction to Physiology and Homeostasis

Cell Physiology

Principles of Neural and Hormonal Communication

The Central Nervous System

The Peripheral Nervous System: Afferent Division and Special Senses

The Peripheral Nervous System: Efferent Division

Muscle Physiology

Cardiac Physiology

The Blood Vessels and Blood Pressure

The Blood and Body Defenses

The Respiratory System

The Urinary System

Fluid and Acid-Base Balance

The Digestive System

Energy Balance and Temperature Regulation

The Endocrine System

The Reproductive System

Filters

Exam 3: The Plasma Membrane and Membrane Potential

The sodium-potassium pump moves ____ sodium ions out of the cell for every 2 potassium ions it moves into the cell.

Which of the following moves across the membrane by facilitated diffusion?

If a concentration or electrical gradient is present for a given substance, the substance will always passively permeate the membrane.

Extracellular messengers binding on surface receptors may exert effects on cells via all the following means, except:

The resting membrane potential of a typical neuron is more negative then the equilibrium potential for potassium.

____________________ are the cells that secrete the majority of the composition of the extracellular matrix.

____________________ are connecting tunnels in gaps between adjacent cells.

At resting membrane potential

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 in the presence of substance Z there is a decreased rate of entry of substance X, what characteristic is being exemplified?

____________________ refers to a separation of opposite charges across the membrane.

The primary barrier to passage of water-soluble substances across the plasma membrane is the outer layer of carbohydrates.

Potassium movement into cells always requires energy expenditure.

In a water solution containing dissolved salt:

Phospholipids

Which statement regarding membrane proteins is incorrect?

Indicate the various roles of the following ions: -anion to which the membrane is impermeable

Facilitated diffusion

With active transport, ATP energy is used in the phosphorylation-dephosphorylation cycle of the carrier.

Movement of K+ into the cell requires energy expenditure, whereas movement of Na+ into the cell does not.

Introduction to Physiology and Homeostasis

Cell Physiology

Principles of Neural and Hormonal Communication

The Central Nervous System

The Peripheral Nervous System: Afferent Division and Special Senses

The Peripheral Nervous System: Efferent Division

Muscle Physiology

Cardiac Physiology

The Blood Vessels and Blood Pressure

The Blood and Body Defenses

The Respiratory System

The Urinary System

Fluid and Acid-Base Balance

The Digestive System

Energy Balance and Temperature Regulation

The Endocrine System

The Reproductive System

Filters

Movement of K⁺ into the cell requires energy expenditure, whereas movement of Na⁺ into the cell does not.