Question 1

Which of the following statements about the Na⁺/K⁺ pump is False?

Accepted Answer

A)  It transports Na⁺ out of the cell and K⁺ into the cell. 
B)  It is present in neurons. 
C)  Its activity requires the expenditure of metabolic (cellular) energy. 
D)  It transports Na⁺ and K⁺ in a 1:1 ratio. 
A)  It transports Na⁺ out of the cell and K⁺ into the cell. 
B)  It is present in neurons. 
C)  Its activity requires the expenditure of metabolic (cellular) energy. 
D)  It transports Na⁺ and K⁺ in a 1:1 ratio.

Question 2

You mix one liter of 300 mOsM NaCl with two liters 450 mOsM glucose.
A.What is the osmolarity of the new solution?
B.What is the final osmolarity of the NaCl in the new solution?
C.What is the final osmolarity of glucose in the new solution?
D.What is the tonicity of this new solution compared to a red blood cell with 300 mOsM nonpenetrating solute?

Accepted Answer

A.300 mOsM NaCl × 1 L = 300 mOsmoles NaC

Question 3

The membrane proteins that bind to a ligand and act in the body's chemical signaling system are ________.

Accepted Answer

The answer of The membrane proteins that bind to a...

Question 4

Substances that readily dissolve in water and do not readily dissolve in lipids are

Accepted Answer

A)  hydrophobic and lipophobic. 
B)  hydrophilic and lipophobic. 
C)  hydrophobic and lipophilic. 
D)  hydrophilic and lipophilic. 
A)  hydrophobic and lipophobic. 
B)  hydrophilic and lipophobic. 
C)  hydrophobic and lipophilic. 
D)  hydrophilic and lipophilic.

Question 5

Explain the term resting membrane potential difference.

Accepted Answer

See "The Resting Mem

Question 6

How do most polar molecules move through a cell membrane? Explain why water, a polar molecule, is able to cross the nonpolar portion of a cell membrane.

Accepted Answer

Most polar molecules must be assisted by

Question 7

Match the transport process to its description.
-the use of ATP to move molecules

Accepted Answer

A) simple diffusion 
B) facilitated diffusion 
C) both 
D) Neither 
A) simple diffusion 
B) facilitated diffusion 
C) both 
D) Neither

Question 8

Channel proteins that allow water to pass are called ________.

Accepted Answer

The answer of Channel proteins that allow water to pass...

Question 9

What are the two extracellular fluid compartments in the body?

Accepted Answer

A)  intracellular and plasma 
B)  plasma and interstitial 
C)  interstitial and intracellular 
D)  plasma and the fluid portion of the blood 
E)  None of the answers are correct. 
A)  intracellular and plasma 
B)  plasma and interstitial 
C)  interstitial and intracellular 
D)  plasma and the fluid portion of the blood 
E)  None of the answers are correct.

Question 10

At rest, nerve cells have an unequal distribution of ions on either side of the cell membrane, producing the ________.

Accepted Answer

resting me

Question 11

If a 10% sucrose solution is separated from a 20% sucrose solution by a membrane impermeable to sucrose, in which direction will net movement of water occur?

Accepted Answer

A)  from the 10% sucrose solution to the 20% sucrose solution only 
B)  from the 20% sucrose solution to the 10% sucrose solution only 
C)  from the 10% sucrose solution to the 20% sucrose solution and from the 20% sucrose solution to the 10% sucrose solution 
D)  There will be no net movement of water in this case. 
E)  None of the answers are correct. 
A)  from the 10% sucrose solution to the 20% sucrose solution only 
B)  from the 20% sucrose solution to the 10% sucrose solution only 
C)  from the 10% sucrose solution to the 20% sucrose solution and from the 20% sucrose solution to the 10% sucrose solution 
D)  There will be no net movement of water in this case. 
E)  None of the answers are correct.

Question 12

Match the potential or potential change with the causative circumstances.Assume ion movements are net movements.Answers may be used more than once or not at all.
-K⁺ leaves the cell

Accepted Answer

A) resting membrane potential 
B) hyperpolarization 
C) depolarization 
D) repolarization 
E) more than one of the answers 
A) resting membrane potential 
B) hyperpolarization 
C) depolarization 
D) repolarization 
E) more than one of the answers

Question 13

The membrane proteins that catalyze reactions that take place on the external or internal surface of the cell are ________.

Accepted Answer

The answer of The membrane proteins that catalyze reactions that...

Question 14

Based on what you know about the characteristics of membrane transport, explain the results shown on the graph.Each mixture consists of equal parts of glucose and fructose at the indicated concentration.

Accepted Answer

The cell has two separate membrane trans

Question 15

Voltage-gated (voltage-dependent)channels and antiport carriers are both types of

Accepted Answer

A)  structural proteins. 
B)  enzymes. 
C)  transporters. 
D)  receptors. 
A)  structural proteins. 
B)  enzymes. 
C)  transporters. 
D)  receptors.

Question 16

A pump that helps maintain an electrical gradient, such as the Na⁺-K⁺-ATPase is a(n)________ pump.

Accepted Answer

The answer of A pump that helps maintain an electrical...

Question 17

A cell membrane that is selectively permeable

Accepted Answer

A)  randomly chooses which substances will pass through. 
B)  can change which substances pass through by changing its lipid and protein content. 
C)  is impermeable to all substances but water. 
D)  will only allow substances in or out if their concentration in the cell is above or below a certain point. 
A)  randomly chooses which substances will pass through. 
B)  can change which substances pass through by changing its lipid and protein content. 
C)  is impermeable to all substances but water. 
D)  will only allow substances in or out if their concentration in the cell is above or below a certain point.

Question 18

The Na⁺-K⁺-ATPase pumps (this number of)________ Na⁺ ions ________ (into/out of)the cell and (this number of)________ K⁺ ions ________ (into/out of)the cell.

Accepted Answer

3 Na⁺, out

Question 19

Match the transport process to its description.
-the movement of molecules against the concentration gradient

Accepted Answer

A) active transport 
B) passive transport 
A) active transport 
B) passive transport

Question 20

Match the membrane protein with its function.
-receptors

Accepted Answer

A) transfer signals from the extracellular environment to the cytoplasm of the cell 
B) form cell-to-cell connections 
C) bind to molecules to facilitate entry to or exit from the cell 
D) ligands bind to these proteins and are changed by the protein 
A) transfer signals from the extracellular environment to the cytoplasm of the cell 
B) form cell-to-cell connections 
C) bind to molecules to facilitate entry to or exit from the cell 
D) ligands bind to these proteins and are changed by the protein

Exam 5: Membrane Dynamics

Which of the following statements about the Na⁺/K⁺ pump is False?

The membrane proteins that bind to a ligand and act in the body's chemical signaling system are ________.

Substances that readily dissolve in water and do not readily dissolve in lipids are

Explain the term resting membrane potential difference.

How do most polar molecules move through a cell membrane? Explain why water, a polar molecule, is able to cross the nonpolar portion of a cell membrane.

Match the transport process to its description. -the use of ATP to move molecules

Channel proteins that allow water to pass are called ________.

What are the two extracellular fluid compartments in the body?

At rest, nerve cells have an unequal distribution of ions on either side of the cell membrane, producing the ________.

If a 10% sucrose solution is separated from a 20% sucrose solution by a membrane impermeable to sucrose, in which direction will net movement of water occur?

Match the potential or potential change with the causative circumstances.Assume ion movements are net movements.Answers may be used more than once or not at all. -K⁺ leaves the cell

The membrane proteins that catalyze reactions that take place on the external or internal surface of the cell are ________.

Based on what you know about the characteristics of membrane transport, explain the results shown on the graph.Each mixture consists of equal parts of glucose and fructose at the indicated concentration.

Voltage-gated (voltage-dependent)channels and antiport carriers are both types of

A pump that helps maintain an electrical gradient, such as the Na⁺-K⁺-ATPase is a(n)________ pump.

A cell membrane that is selectively permeable

The Na⁺-K⁺-ATPase pumps (this number of)________ Na⁺ ions ________ (into/out of)the cell and (this number of)________ K⁺ ions ________ (into/out of)the cell.

Match the transport process to its description. -the movement of molecules against the concentration gradient

Match the membrane protein with its function. -receptors

Introduction to Physiology

Molecular Interactions

Compartmentation: Cells and Tissues

Energy and Cellular Metabolism

Communication, Integration, and Homeostasis

Introduction to the Endocrine System

Neurons: Cellular and Network Properties

The Central Nervous System

Sensory Physiology

Efferent Division: Autonomic and Somatic Motor Control

Muscles

Integrative Physiology I: Control of Body Movement

Cardiovascular Physiology

Blood Flow and the Control of Blood Pressure

Blood

Mechanics of Breathing

Gas Exchange and Transport

The Kidneys

Integrative Physiology II: Fluid and Electrolyte Balance

The Digestive System

Metabolism and Energy Balance

Endocrine Control of Growth and Metabolism

The Immune System

Integrative Physiology III: Exercise

Reproduction and Development

Filters

The Na⁺-K⁺-ATPase pumps (this number of) Na⁺ ions (into/out of)the cell and (this number of) K⁺ ions (into/out of)the cell.