Question 1

The concentration of calcium in the cytosol of cells is very much lower than the concentration of extracellular calcium.

Accepted Answer

A) True 
 B)False  True

Question 2

An example of a hypertonic solution is

Accepted Answer

A) 200 mM NaCl 
B) 300 mM glucose 
C) 100 mM MgCl2 
D) 400 mM urea 
E) None of the choices are correct 
A) 200 mM NaCl 
B) 300 mM glucose 
C) 100 mM MgCl2 
D) 400 mM urea 
E) None of the choices are correct A

Question 3

Integral membrane proteins can form channels through which ions such as Na+ and K+ can diffuse.

Accepted Answer

A) True 
 B)False  True

Question 4

The luminal side of an epithelial cell is also known as the basolateral side.

Accepted Answer

A) True 
 B)False

Question 5

Most organic solutes cross epithelial membranes by simple diffusion on the lumen side followed by active transport across the blood side of the membrane.

Accepted Answer

A) True 
 B)False

Question 6

The final equilibrium state reached by a molecule that enters a cell by facilitated diffusion is the same as that for a molecule that enters the cell by diffusion.

Accepted Answer

A) True 
 B)False

Question 7

If a cell were placed in a solution of 0.15 M NaCl,it would shrink.

Accepted Answer

A) True 
 B)False

Question 8

Once formed inside of the cell most endocytic vesicles will fuse with which organelle for sorting?

Accepted Answer

A) Endoplasmic reticulum 
B) Golgi apparatus 
C) Endosome 
D) Nucleus 
E) Mitochondria 
A) Endoplasmic reticulum 
B) Golgi apparatus 
C) Endosome 
D) Nucleus 
E) Mitochondria

Question 9

In active transport,the affinity of any given binding site for the molecule to be transported changes as the site goes from facing one side of the membrane to facing the other side.

Accepted Answer

A) True 
 B)False

Question 10

A portion of a cell's plasma membrane is removed during endocytosis.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following statements about the Na,K pump is false?

Accepted Answer

A) It transports Na+ out of cells and K+ into cells 
B) It binds to and hydrolyzes ATP 
C) It is constantly active in all cells 
D) Its activity requires the expenditure of metabolic energy 
E) It transports Na+ and K+ in a 1:1 ratio 
A) It transports Na+ out of cells and K+ into cells 
B) It binds to and hydrolyzes ATP 
C) It is constantly active in all cells 
D) Its activity requires the expenditure of metabolic energy 
E) It transports Na+ and K+ in a 1:1 ratio

Question 12

The functions of the process known as potocytosis in homeostasis have been extensively studied and are very well known and understood beyond any speculation to include,cell signaling,trans-cellular transport and cholesterol homeostasis.

Accepted Answer

A) True 
 B)False

Question 13

Equal concentrations of two solutes,A and B,are placed into the same beaker at the same time.Solute A reaches diffusion equilibrium faster than solute B.What is the most likely explanation for this observation?

Accepted Answer

A) The temperature was greater for solute A than solute B 
B) The concentration gradient for A was greater than B 
C) Solute A is smaller than solute B 
D) Solute A traveled a shorter distance than solute B 
E) All of the choices are logical explanations 
A) The temperature was greater for solute A than solute B 
B) The concentration gradient for A was greater than B 
C) Solute A is smaller than solute B 
D) Solute A traveled a shorter distance than solute B 
E) All of the choices are logical explanations

Question 14

If it takes solute A 1 second to diffuse 1 millimeter,how long will it take solute A to diffuse 10 millimeters under the same conditions?

Accepted Answer

A) 1 second 
B) 10 seconds 
C) 50 seconds 
D) 100 seconds 
E) 1000 seconds 
A) 1 second 
B) 10 seconds 
C) 50 seconds 
D) 100 seconds 
E) 1000 seconds

Question 15

Endocytosis of any kind requires metabolic energy.

Accepted Answer

A) True 
 B)False

Question 16

Mediated transport across cell membranes

Accepted Answer

A) Refers to the movement of ions through protein channels 
B) Refers both to diffusion and to the active transport of molecules 
C) Is characterized by saturable carriers and a maximum velocity of transport 
D) Both refers to the movement of ions through protein channels and refers both to diffusion and to the active transport of molecules are correct 
E) Both refers both to diffusion and to the active transport of molecules and is characterized by saturable carriers and a maximum velocity of transport are correct 
A) Refers to the movement of ions through protein channels 
B) Refers both to diffusion and to the active transport of molecules 
C) Is characterized by saturable carriers and a maximum velocity of transport 
D) Both refers to the movement of ions through protein channels and refers both to diffusion and to the active transport of molecules are correct 
E) Both refers both to diffusion and to the active transport of molecules and is characterized by saturable carriers and a maximum velocity of transport are correct

Question 17

Which of the following statements regarding the diffusion of nonpolar solutes across cell membranes is correct?

Accepted Answer

A) At equilibrium for solute X, the flux of X across cell membranes is zero 
B) At equilibrium for solute X, the net flux of X across cell membranes is zero 
C) At equilibrium for solute X, the concentration of X inside the cell is equal to its concentration outside the cell 
D) Both at equilibrium for solute X, the flux of X across cell membranes is zero and at equilibrium for solute X, the concentration of X inside the cell is equal to its concentration outside the cell are correct 
E) Both at equilibrium for solute X, the net flux of X across cell membranes is zero and at equilibrium for solute X, the concentration of X inside the cell is equal to its concentration outside the cell are correct 
A) At equilibrium for solute X, the flux of X across cell membranes is zero 
B) At equilibrium for solute X, the net flux of X across cell membranes is zero 
C) At equilibrium for solute X, the concentration of X inside the cell is equal to its concentration outside the cell 
D) Both at equilibrium for solute X, the flux of X across cell membranes is zero and at equilibrium for solute X, the concentration of X inside the cell is equal to its concentration outside the cell are correct 
E) Both at equilibrium for solute X, the net flux of X across cell membranes is zero and at equilibrium for solute X, the concentration of X inside the cell is equal to its concentration outside the cell are correct

Question 18

Phagocytic leukocytes use the process to engulf foreign bacteria and destroy them within ribosomes.

Accepted Answer

A) True 
 B)False

Question 19

The net flux of a penetrating solute into a cell will increase if the

Accepted Answer

A) Permeability constant for that solute increases 
B) Temperature increases 
C) Concentration of that solute in the extracellular fluid increases 
D) Both permeability constant for that solute increases and concentration of that solute in the extracellular fluid increases are correct 
E) All of the choices are correct 
A) Permeability constant for that solute increases 
B) Temperature increases 
C) Concentration of that solute in the extracellular fluid increases 
D) Both permeability constant for that solute increases and concentration of that solute in the extracellular fluid increases are correct 
E) All of the choices are correct

Question 20

A cell is placed into a 1 millimolar solution of substance X and over time you witness the concentration of X inside the cell increase to 5 millimolar.The best explanation for this is:

Accepted Answer

A) X is moving into the cell by simple diffusion 
B) X is moving into the cell by diffusion through a protein channel 
C) X is moving into the cell by facilitated diffusion 
D) X is moving into the cell by primary active transport 
E) It is not possible to tell which mechanism is responsible for the transport of X 
A) X is moving into the cell by simple diffusion 
B) X is moving into the cell by diffusion through a protein channel 
C) X is moving into the cell by facilitated diffusion 
D) X is moving into the cell by primary active transport 
E) It is not possible to tell which mechanism is responsible for the transport of X

The concentration of calcium in the cytosol of cells is very much lower than the concentration of extracellular calcium.

An example of a hypertonic solution is

Integral membrane proteins can form channels through which ions such as Na+ and K+ can diffuse.

The luminal side of an epithelial cell is also known as the basolateral side.

Most organic solutes cross epithelial membranes by simple diffusion on the lumen side followed by active transport across the blood side of the membrane.

The final equilibrium state reached by a molecule that enters a cell by facilitated diffusion is the same as that for a molecule that enters the cell by diffusion.

If a cell were placed in a solution of 0.15 M NaCl,it would shrink.

Once formed inside of the cell most endocytic vesicles will fuse with which organelle for sorting?

In active transport,the affinity of any given binding site for the molecule to be transported changes as the site goes from facing one side of the membrane to facing the other side.

A portion of a cell's plasma membrane is removed during endocytosis.

Which of the following statements about the Na,K pump is false?

The functions of the process known as potocytosis in homeostasis have been extensively studied and are very well known and understood beyond any speculation to include,cell signaling,trans-cellular transport and cholesterol homeostasis.

Equal concentrations of two solutes,A and B,are placed into the same beaker at the same time.Solute A reaches diffusion equilibrium faster than solute B.What is the most likely explanation for this observation?

If it takes solute A 1 second to diffuse 1 millimeter,how long will it take solute A to diffuse 10 millimeters under the same conditions?

Endocytosis of any kind requires metabolic energy.

Mediated transport across cell membranes

Which of the following statements regarding the diffusion of nonpolar solutes across cell membranes is correct?

Phagocytic leukocytes use the process to engulf foreign bacteria and destroy them within ribosomes.

The net flux of a penetrating solute into a cell will increase if the

A cell is placed into a 1 millimolar solution of substance X and over time you witness the concentration of X inside the cell increase to 5 millimolar.The best explanation for this is:

Homeostasis: a Framework for Human Physiology

Chemical Composition of the Body

Cellular Structure, Proteins, and Metabolism

Control of Cells by Chemical Messengers

Neuronal Signaling and the Structure of the Nervous System

Sensory Physiology

Consciousness, the Brain, and Behavior

Muscle

Control of Body Movement

The Endocrine System

Cardiovascular Physiology

Respiratory Physiology

The Kidneys and Regulation of Water and Inorganic Ions

The Digestion and Absorption of Food

Regulation of Organic Metabolism and Energy Balance

Reproduction

The Immune System

Medical Physiology: Integration Using Clinical Cases

Filters

Exam 4: Movement of Molecules Across Cell Membranes

The concentration of calcium in the cytosol of cells is very much lower than the concentration of extracellular calcium.

An example of a hypertonic solution is

Integral membrane proteins can form channels through which ions such as Na+ and K+ can diffuse.

The luminal side of an epithelial cell is also known as the basolateral side.

Most organic solutes cross epithelial membranes by simple diffusion on the lumen side followed by active transport across the blood side of the membrane.

The final equilibrium state reached by a molecule that enters a cell by facilitated diffusion is the same as that for a molecule that enters the cell by diffusion.

If a cell were placed in a solution of 0.15 M NaCl,it would shrink.

Once formed inside of the cell most endocytic vesicles will fuse with which organelle for sorting?

In active transport,the affinity of any given binding site for the molecule to be transported changes as the site goes from facing one side of the membrane to facing the other side.

A portion of a cell's plasma membrane is removed during endocytosis.

Which of the following statements about the Na,K pump is false?

The functions of the process known as potocytosis in homeostasis have been extensively studied and are very well known and understood beyond any speculation to include,cell signaling,trans-cellular transport and cholesterol homeostasis.

Equal concentrations of two solutes,A and B,are placed into the same beaker at the same time.Solute A reaches diffusion equilibrium faster than solute B.What is the most likely explanation for this observation?

If it takes solute A 1 second to diffuse 1 millimeter,how long will it take solute A to diffuse 10 millimeters under the same conditions?

Endocytosis of any kind requires metabolic energy.

Mediated transport across cell membranes

Which of the following statements regarding the diffusion of nonpolar solutes across cell membranes is correct?

Phagocytic leukocytes use the process to engulf foreign bacteria and destroy them within ribosomes.

The net flux of a penetrating solute into a cell will increase if the

A cell is placed into a 1 millimolar solution of substance X and over time you witness the concentration of X inside the cell increase to 5 millimolar.The best explanation for this is:

Homeostasis: a Framework for Human Physiology

Chemical Composition of the Body

Cellular Structure, Proteins, and Metabolism

Control of Cells by Chemical Messengers

Neuronal Signaling and the Structure of the Nervous System

Sensory Physiology

Consciousness, the Brain, and Behavior

Muscle

Control of Body Movement

The Endocrine System

Cardiovascular Physiology

Respiratory Physiology

The Kidneys and Regulation of Water and Inorganic Ions

The Digestion and Absorption of Food

Regulation of Organic Metabolism and Energy Balance

Reproduction

The Immune System

Medical Physiology: Integration Using Clinical Cases

Filters