Question 1

The higher the osmolarity of a solution,the higher the concentration of water in it.

Accepted Answer

A) True 
 B)False

Question 2

Adding one gram of NaCl to one liter of water will lower the water concentration twice as much as adding one gram of glucose.

Accepted Answer

A) True 
 B)False

Question 3

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 4

Which of the following statements regarding the diffusion of a nonpolar solute X across a cell membrane is correct?

Accepted Answer

A) At equilibrium the net flux of X across the cell membrane is zero. 
B) At equilibrium,X will cease moving across the cell membrane. 
C) Solute X will be unable to reach equilibrium because it is nonpolar. 
D) Solute X will reach equilibrium,but the concentration will be much higher on the inside of the cell because of the smaller volume. 
E) At equilibrium,movement of X across the membrane will be much faster in one direction than in the other. 
A) At equilibrium the net flux of X across the cell membrane is zero. 
B) At equilibrium,X will cease moving across the cell membrane. 
C) Solute X will be unable to reach equilibrium because it is nonpolar. 
D) Solute X will reach equilibrium,but the concentration will be much higher on the inside of the cell because of the smaller volume. 
E) At equilibrium,movement of X across the membrane will be much faster in one direction than in the other.

Question 5

The component of the plasma membrane that acts as a selective barrier to diffusion of polar molecules is the integral proteins.

Accepted Answer

A) True 
 B)False

Question 6

Although permeability to mineral ions does not vary much from one cell to another,different cells vary considerably in their permeability to nonpolar molecules.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following solutions is not isotonic to human cells?

Accepted Answer

A) 150 mM NaCl 
B) 300 mM urea 
C) 100 mM MgCl2 
D) 300 mOsm NaCl 
A) 150 mM NaCl 
B) 300 mM urea 
C) 100 mM MgCl2 
D) 300 mOsm NaCl

Question 8

Net movement of solute across an epithelium that is permeable to water is always accompanied by movement of water in the opposite direction.

Accepted Answer

A) True 
 B)False

Question 9

The plasma membranes of epithelial cells facing the lumen of hollow organs or tubes have the same transport proteins as the plasma membranes that face the interstitial fluid.

Accepted Answer

A) True 
 B)False

Question 10

In general,polar molecules diffuse more rapidly across cell membranes than do nonpolar molecules.

Accepted Answer

A) True 
 B)False

Question 11

The fate of all endocytotic vesicles is digestion of their contents by lysosomal enzymes.

Accepted Answer

A) True 
 B)False

Question 12

The permeability of the plasma membrane to mineral ions:

Accepted Answer

A) is not influenced by channels formed by proteins. 
B) is the same in all cell types. 
C) is affected by differences in electrical charge on the two sides of the membrane. 
D) is zero in all living cells. 
E) is only possible because of the hydrophobic interior of the lipid bilayer. 
A) is not influenced by channels formed by proteins. 
B) is the same in all cell types. 
C) is affected by differences in electrical charge on the two sides of the membrane. 
D) is zero in all living cells. 
E) is only possible because of the hydrophobic interior of the lipid bilayer.

The higher the osmolarity of a solution,the higher the concentration of water in it.

Adding one gram of NaCl to one liter of water will lower the water concentration twice as much as adding one gram of glucose.

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

Which of the following statements regarding the diffusion of a nonpolar solute X across a cell membrane is correct?

The component of the plasma membrane that acts as a selective barrier to diffusion of polar molecules is the integral proteins.

Although permeability to mineral ions does not vary much from one cell to another,different cells vary considerably in their permeability to nonpolar molecules.

Which of the following solutions is not isotonic to human cells?

Net movement of solute across an epithelium that is permeable to water is always accompanied by movement of water in the opposite direction.

The plasma membranes of epithelial cells facing the lumen of hollow organs or tubes have the same transport proteins as the plasma membranes that face the interstitial fluid.

In general,polar molecules diffuse more rapidly across cell membranes than do nonpolar molecules.

The fate of all endocytotic vesicles is digestion of their contents by lysosomal enzymes.

The permeability of the plasma membrane to mineral ions:

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

Defense Mechanisms of the Body

Medical Physiology: Integration Using Clinical Cases

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Exam 4: Movement of Molecules Across Cell Membranes

The higher the osmolarity of a solution,the higher the concentration of water in it.

Adding one gram of NaCl to one liter of water will lower the water concentration twice as much as adding one gram of glucose.

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

Which of the following statements regarding the diffusion of a nonpolar solute X across a cell membrane is correct?

The component of the plasma membrane that acts as a selective barrier to diffusion of polar molecules is the integral proteins.

Although permeability to mineral ions does not vary much from one cell to another,different cells vary considerably in their permeability to nonpolar molecules.

Which of the following solutions is not isotonic to human cells?

Net movement of solute across an epithelium that is permeable to water is always accompanied by movement of water in the opposite direction.

The plasma membranes of epithelial cells facing the lumen of hollow organs or tubes have the same transport proteins as the plasma membranes that face the interstitial fluid.

In general,polar molecules diffuse more rapidly across cell membranes than do nonpolar molecules.

The fate of all endocytotic vesicles is digestion of their contents by lysosomal enzymes.

The permeability of the plasma membrane to mineral ions:

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

Defense Mechanisms of the Body

Medical Physiology: Integration Using Clinical Cases

Filters