Question 1

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

Accepted Answer

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

Question 2

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 A?

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 3

During osmosis,

Accepted Answer

A)  water moves down its own concentration gradient. 
B)  water moves to an area of higher solute concentration. 
C)  the solute moves against its concentration gradient. 
D)  only (a) and (b) above. 
E)  all of these answers. 
A)  water moves down its own concentration gradient. 
B)  water moves to an area of higher solute concentration. 
C)  the solute moves against its concentration gradient. 
D)  only (a) and (b) above. 
E)  all of these answers.

Question 4

The membrane-bound "middleman" that acts as an intermediary between the receptor and adenylate cyclase in the cAMP second-messenger system is a(n) ____________________.

Accepted Answer

The answer of The membrane-bound "middleman" that acts as an...

Question 5

What term refers to the effect a non-penetrating solute in a solution has on cell volume?

Accepted Answer

A)  osmolarity 
B)  osmotic pressure 
C)  tonicity 
D)  osmosis 
E)  solubility 
A)  osmolarity 
B)  osmotic pressure 
C)  tonicity 
D)  osmosis 
E)  solubility

Question 6

In the lipid bilayer of the plasma membrane, the hydrophobic tails of the phospholipids orient toward the center of the membrane, away from water.

Accepted Answer

A) True 
 B)False

Question 7

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. concentration of Na? in the extracellular fluid
B. concentration of Na? in the intracellular fluid of a resting nerve cell

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 8

Refer to the accompanying diagram to match the following ions with the statements below. Answers may be used more than once
-Ion that is pumped out of the cell by the Na-K pump.

Accepted Answer

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

Question 9

Of the lipids in the plasma membrane, ____________________ are most abundant, with lesser amounts of ____________________.

Accepted Answer

phospholip

Question 10

The carrier molecule actually moves from side to side through the membrane as it transports material across.

Accepted Answer

A) True 
 B)False

Question 11

Function of the Na+-K+ pump is an example of:

Accepted Answer

A)  carrier-mediated transport. 
B)  diffusion. 
C)  exocytosis. 
D)  pinocytosis. 
E)  active transport. 
A)  carrier-mediated transport. 
B)  diffusion. 
C)  exocytosis. 
D)  pinocytosis. 
E)  active transport.

Question 12

With secondary active transport, the movement of

Accepted Answer

A)  Na+ into the cell by the cotransport carrier is downhill. 
B)  Na+ into the cell by the cotransport carrier is uphill. 
C)  glucose by the cotransport carrier is uphill. 
D)  two of these answers. 
E)  none of these answers. 
A)  Na+ into the cell by the cotransport carrier is downhill. 
B)  Na+ into the cell by the cotransport carrier is uphill. 
C)  glucose by the cotransport carrier is uphill. 
D)  two of these answers. 
E)  none of these answers.

Question 13

Tight junctions

Accepted Answer

A)  prevent passage of materials between epithelial cells. 
B)  force materials to pass through cells. 
C)  are commonly found in digestive tract linings. 
D)  all of these answers. 
E)  none of these answers. 
A)  prevent passage of materials between epithelial cells. 
B)  force materials to pass through cells. 
C)  are commonly found in digestive tract linings. 
D)  all of these answers. 
E)  none of these answers.

Question 14

____________________ refers to the transfer of a phosphate group from ATP to a protein, thereby bringing about a change in the shape and function of the protein.

Accepted Answer

The answer of ____________________ refers to the transfer of a...

Question 15

Net sodium movement into the cell occurs passively, whereas net sodium movement out of the cell occurs actively.

Accepted Answer

A) True 
 B)False

Question 16

The Na+-K+ pump

Accepted Answer

A)  pumps Na+ into the cell. 
B)  pumps K+ into the cell. 
C)  pumps K+ out of the cell. 
D)  has a higher affinity for K+ when the carrier is phosphorylated. 
E)  more than one of these answers. 
A)  pumps Na+ into the cell. 
B)  pumps K+ into the cell. 
C)  pumps K+ out of the cell. 
D)  has a higher affinity for K+ when the carrier is phosphorylated. 
E)  more than one of these answers.

Question 17

The resting membrane potential of a typical nerve cell is

Accepted Answer

A)  +50 mV. 
B)  +70 mV. 
C)  0 mV. 
D)  -50 mV. 
E)  -70 mV. 
A)  +50 mV. 
B)  +70 mV. 
C)  0 mV. 
D)  -50 mV. 
E)  -70 mV.

Question 18

The concentration gradient for Na+

Accepted Answer

A)  favors its movement into the cell at resting potential. 
B)  favors its movement out of the cell at resting potential. 
C)  is maintained by the Na+-K+ pump. 
D)  both (a) and (c) above. 
E)  both (b) and (c) above. 
A)  favors its movement into the cell at resting potential. 
B)  favors its movement out of the cell at resting potential. 
C)  is maintained by the Na+-K+ pump. 
D)  both (a) and (c) above. 
E)  both (b) and (c) above.

Question 19

Which of the following statements concerning gap junctions is incorrect?

Accepted Answer

A)  gap junctions are communicating junctions. 
B)  at a gap junction, filaments of unknown composition extend between the plasma membranes of two closely adjacent but not touching cells, acting as "spot rivets" to anchor the cells together. 
C)  gap junctions are formed by small connecting tunnels that link two adjacent cells and permit exchange of small water-soluble particles between the cells. 
D)  gap junctions play an important role in transmission of electrical activity throughout an entire muscle mass. 
E)  connexons are an important structural component of gap junctions. 
A)  gap junctions are communicating junctions. 
B)  at a gap junction, filaments of unknown composition extend between the plasma membranes of two closely adjacent but not touching cells, acting as "spot rivets" to anchor the cells together. 
C)  gap junctions are formed by small connecting tunnels that link two adjacent cells and permit exchange of small water-soluble particles between the cells. 
D)  gap junctions play an important role in transmission of electrical activity throughout an entire muscle mass. 
E)  connexons are an important structural component of gap junctions.

Question 20

The surface carbohydrates within the plasma membrane serve as cell adhesion molecules (CAMs) that cells use to grip a hold of one another and to surrounding connective-tissue fibers.

Accepted Answer

A) True 
 B)False

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

During osmosis,

The membrane-bound "middleman" that acts as an intermediary between the receptor and adenylate cyclase in the cAMP second-messenger system is a(n) ____________________.

What term refers to the effect a non-penetrating solute in a solution has on cell volume?

In the lipid bilayer of the plasma membrane, the hydrophobic tails of the phospholipids orient toward the center of the membrane, away from water.

Refer to the accompanying diagram to match the following ions with the statements below. Answers may be used more than once -Ion that is pumped out of the cell by the Na-K pump.

Of the lipids in the plasma membrane, are most abundant, with lesser amounts of .

The carrier molecule actually moves from side to side through the membrane as it transports material across.

Function of the Na⁺-K⁺ pump is an example of:

With secondary active transport, the movement of

Tight junctions

____________________ refers to the transfer of a phosphate group from ATP to a protein, thereby bringing about a change in the shape and function of the protein.

Net sodium movement into the cell occurs passively, whereas net sodium movement out of the cell occurs actively.

The Na⁺-K⁺ pump

The resting membrane potential of a typical nerve cell is

The concentration gradient for Na⁺

Which of the following statements concerning gap junctions is incorrect?

The surface carbohydrates within the plasma membrane serve as cell adhesion molecules (CAMs) that cells use to grip a hold of one another and to surrounding connective-tissue fibers.

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

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

During osmosis,

The membrane-bound "middleman" that acts as an intermediary between the receptor and adenylate cyclase in the cAMP second-messenger system is a(n) ____________________.

What term refers to the effect a non-penetrating solute in a solution has on cell volume?

In the lipid bilayer of the plasma membrane, the hydrophobic tails of the phospholipids orient toward the center of the membrane, away from water.

Refer to the accompanying diagram to match the following ions with the statements below. Answers may be used more than once -Ion that is pumped out of the cell by the Na-K pump.

Of the lipids in the plasma membrane, ____________________ are most abundant, with lesser amounts of ____________________.

The carrier molecule actually moves from side to side through the membrane as it transports material across.

Function of the Na+-K+ pump is an example of:

With secondary active transport, the movement of

Tight junctions

____________________ refers to the transfer of a phosphate group from ATP to a protein, thereby bringing about a change in the shape and function of the protein.

Net sodium movement into the cell occurs passively, whereas net sodium movement out of the cell occurs actively.

The Na+-K+ pump

The resting membrane potential of a typical nerve cell is

The concentration gradient for Na+

Which of the following statements concerning gap junctions is incorrect?

The surface carbohydrates within the plasma membrane serve as cell adhesion molecules (CAMs) that cells use to grip a hold of one another and to surrounding connective-tissue fibers.

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

Of the lipids in the plasma membrane, are most abundant, with lesser amounts of .

Function of the Na⁺-K⁺ pump is an example of:

The Na⁺-K⁺ pump

The concentration gradient for Na⁺