Question 1

Cells use exocytosis to

Accepted Answer

A)   move away from danger.
B)   ingest nutrients.
C)   pump hydrogen molecules across the membrane.
D)   release substances from the cell.
E)   create new cells.

Question 2

Phospholipids spontaneously form a bilayer in an aqueous solution. Why do the heads of the phospholipids point out and the tails point toward one another?

Accepted Answer

A)   The tails are repelled by the aqueous environment, and the heads will directly interact with the aqueous solution.
B)   The tails are nonpolar and form hydrogen bonds with one another.
C)   The heads are repelled by the water inside and outside the cell.

Question 3

Why does the cell perform endocytosis in addition to active and passive transport?

Accepted Answer

Endocytosis is required for th...

Question 4

Which of the following types of membrane proteins are responsible for facilitated diffusion?

Accepted Answer

A)   Connection proteins
B)   Receptor proteins
C)   Enzymes
D)   Transport proteins
E)   Recognition proteins

Question 5

Glucose is a six-carbon sugar that diffuses slowly through artificial phospholipid bilayers. The cells lining the small intestine, however, rapidly move large quantities of glucose from the glucose-rich food into their glucose-poor cytoplasm. Given this information, which transport mechanism is most probably functioning in the intestinal cells?

Accepted Answer

A)   Exocytosis
B)   Facilitated diffusion
C)   Aquaporin transport
D)   Simple diffusion
E)   Osmosis

Question 6

How does the cell membrane act as a ʺgatekeeperʺ for the cell?

Accepted Answer

It separates the internal and ...

Question 7

Which of the following types of membrane proteins are responsible for conveying external messages such as those sent by a hormone signal?

Accepted Answer

A)   Receptor proteins
B)   Recognition proteins
C)   Transport proteins
D)   Enzymes
E)   Connection proteins

Question 8

The__________ portion of the cell membrane is responsible for the isolating function of the membrane, whereas the__________ portion regulates exchange and communication with the environment.

Accepted Answer

A)   carbohydrate; lipid
B)   lipid; protein
C)   cholesterol; lipid
D)   nucleic acid; lipid
E)   protein; cholesterol

Question 9

Suppose you have two glucose solutions separated by a selectively permeable membrane. If there is a concentration gradient of glucose across the membrane, then the solutions cannot be relative to each other.

Accepted Answer

A)   isotonic
B)   hypertonic
C)   hypotonic

Question 10

Which of the following groups includes carrier and channel proteins?

Accepted Answer

A)   Transport proteins
B)   Receptor proteins
C)   Connection proteins
D)   Recognition proteins

Question 11

The slowest rate of diffusion of dye particles in water will occur at

Accepted Answer

A)   20°C.
B)   30°C.
C)   60°C.
D)   10°C.

Question 12

Compare and contrast the intercellular junctions that allow communication between plant and animal cells.

Accepted Answer

Gap junctions in animal cells ...

Question 13

To say that a cell is ʺselectively permeableʺ means

Accepted Answer

A)   sometimes water passes through, and sometimes it canʹt.
B)   it is permeable to different substances than other cells.
C)   only certain molecules can pass through.
D)   it has different-sized perforations in the membrane.
E)   permeability depends on gradient differences.

Question 14

What happens when diffusion moves molecules across the plasma membrane?

Accepted Answer

A)   Most molecules are capable of crossing the phospholipid bilayer at any location and at basically the same rate.
B)   Energy input is required to transport molecules.
C)   The rate of diffusion cannot be influenced by the cell.
D)   The cell gains needed materials and gets rid of excess materials very quickly.
E)   The process is relatively slow and is driven by concentration gradients.

Question 15

In general, which of the following is (are)  largely responsible for moving substances across the plasma membrane, communicating with other cells, and identifying the cell?

Accepted Answer

A)   Cytoskeleton
B)   Proteins
C)   Nucleic acids
D)   Carbohydrates
E)   Phospholipids

Question 16

What structure in the membrane causes plasma membranes to resist freezing?

Accepted Answer

A)   Cholesterol
B)   Unsaturated fatty acid tails
C)   Nonpolar heads of the phospholipids
D)   Saturated fatty acid tails
E)   Channel proteins

Question 17

The cells of the bladder are joined to one another by __________that prevent substances from passing between the cells of this tissue.

Accepted Answer

The answer of The cells of the bladder are joined...

Question 18

Which of the following occurs as an enzyme produced by a cell is secreted from the cell?

Accepted Answer

A)   Pinocytosis
B)   Receptor-mediated endocytosis
C)   Endocytosis
D)   Exocytosis
E)   Phagocytosis

Question 19

Imagine an artificial cell made with a selectively permeable membrane that allows water to pass through but does not allow sugar to pass. If the artificial cell contains a 1% sugar solution and then you place the cell in a 2% sugar solution, what happens?

Accepted Answer

A)   Sugar diffuses in and water diffuses out until equilibrium is reached.
B)   Water enters the cell because the solution is hypotonic to the cell.
C)   There is no movement of water.
D)   Water leaves the cell because the solution is hypertonic to the cell.

Question 20

A freshwater protozoan, such as Paramecium, tends to__________ because it lives in a__________ environment.

Accepted Answer

A)   gain water; isotonic
B)   lose water; hypertonic
C)   lose water; hypotonic
D)   gain water; hypertonic
E)   gain water; hypotonic

Exam 5: Cell Membrane Structure and Function

Which of the following types of membrane proteins are responsible for conveying external messages such as those sent by a hormone signal?

Correct Answer
verified

What structure in the membrane causes plasma membranes to resist freezing?

Correct Answer
verified

What happens when diffusion moves molecules across the plasma membrane?

Correct Answer
verified

The slowest rate of diffusion of dye particles in water will occur at

Correct Answer
verified

How does the cell membrane act as a ʺgatekeeperʺ for the cell?

Correct Answer
verified
It separates the internal and ...
View Answer

Correct Answer
verified

Why does the cell perform endocytosis in addition to active and passive transport?

Correct Answer
verified
Endocytosis is required for th...
View Answer

Suppose you have two glucose solutions separated by a selectively permeable membrane. If there is a concentration gradient of glucose across the membrane, then the solutions cannot be relative to each other.

Correct Answer
verified

Which of the following types of membrane proteins are responsible for facilitated diffusion?

Correct Answer
verified

Compare and contrast the intercellular junctions that allow communication between plant and animal cells.

Correct Answer
verified
Gap junctions in animal cells ...
View Answer

To say that a cell is ʺselectively permeableʺ means

Correct Answer
verified

The portion of the cell membrane is responsible for the isolating function of the membrane, whereas the portion regulates exchange and communication with the environment.

Correct Answer
verified

In general, which of the following is (are) largely responsible for moving substances across the plasma membrane, communicating with other cells, and identifying the cell?

Correct Answer
verified

Which of the following groups includes carrier and channel proteins?

Correct Answer
verified

Phospholipids spontaneously form a bilayer in an aqueous solution. Why do the heads of the phospholipids point out and the tails point toward one another?

Correct Answer
verified

Cells use exocytosis to

Correct Answer
verified

Imagine an artificial cell made with a selectively permeable membrane that allows water to pass through but does not allow sugar to pass. If the artificial cell contains a 1% sugar solution and then you place the cell in a 2% sugar solution, what happens?

Correct Answer
verified

The cells of the bladder are joined to one another by __________that prevent substances from passing between the cells of this tissue.

Correct Answer
verified

Which of the following occurs as an enzyme produced by a cell is secreted from the cell?

Correct Answer
verified

A freshwater protozoan, such as Paramecium, tends to because it lives in a environment.

Correct Answer
verified

Exam 5: Cell Membrane Structure and Function

Which of the following types of membrane proteins are responsible for conveying external messages such as those sent by a hormone signal?

Correct AnswerverifiedShow Answer

What structure in the membrane causes plasma membranes to resist freezing?

Correct AnswerverifiedShow Answer

What happens when diffusion moves molecules across the plasma membrane?

Correct AnswerverifiedShow Answer

The slowest rate of diffusion of dye particles in water will occur at

Correct AnswerverifiedShow Answer

How does the cell membrane act as a ʺgatekeeperʺ for the cell?

Correct AnswerverifiedIt separates the internal and ...View AnswerShow Answer

Correct AnswerverifiedShow Answer

Why does the cell perform endocytosis in addition to active and passive transport?

Correct AnswerverifiedEndocytosis is required for th...View AnswerShow Answer

Suppose you have two glucose solutions separated by a selectively permeable membrane. If there is a concentration gradient of glucose across the membrane, then the solutions cannot be relative to each other.

Correct AnswerverifiedShow Answer

Which of the following types of membrane proteins are responsible for facilitated diffusion?

Correct AnswerverifiedShow Answer

Compare and contrast the intercellular junctions that allow communication between plant and animal cells.

Correct AnswerverifiedGap junctions in animal cells ...View AnswerShow Answer

To say that a cell is ʺselectively permeableʺ means

Correct AnswerverifiedShow Answer

The__________ portion of the cell membrane is responsible for the isolating function of the membrane, whereas the__________ portion regulates exchange and communication with the environment.

Correct AnswerverifiedShow Answer

In general, which of the following is (are) largely responsible for moving substances across the plasma membrane, communicating with other cells, and identifying the cell?

Correct AnswerverifiedShow Answer

Which of the following groups includes carrier and channel proteins?

Correct AnswerverifiedShow Answer

Phospholipids spontaneously form a bilayer in an aqueous solution. Why do the heads of the phospholipids point out and the tails point toward one another?

Correct AnswerverifiedShow Answer

Cells use exocytosis to

Correct AnswerverifiedShow Answer

Imagine an artificial cell made with a selectively permeable membrane that allows water to pass through but does not allow sugar to pass. If the artificial cell contains a 1% sugar solution and then you place the cell in a 2% sugar solution, what happens?

Correct AnswerverifiedShow Answer

The cells of the bladder are joined to one another by __________that prevent substances from passing between the cells of this tissue.

Correct AnswerverifiedShow Answer

Which of the following occurs as an enzyme produced by a cell is secreted from the cell?

Correct AnswerverifiedShow Answer

A freshwater protozoan, such as Paramecium, tends to__________ because it lives in a__________ environment.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
It separates the internal and ...
View Answer

Correct Answer
verified

Correct Answer
verified
Endocytosis is required for th...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Gap junctions in animal cells ...
View Answer

Correct Answer
verified

The portion of the cell membrane is responsible for the isolating function of the membrane, whereas the portion regulates exchange and communication with the environment.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A freshwater protozoan, such as Paramecium, tends to because it lives in a environment.

Correct Answer
verified