Question 1

What type of cellular junction cements cells together that use cadherins as a belt around each cell?

Accepted Answer

A)   Desmosomes
B)   Gap junctions
C)   Tight junctions
D)   Plasmodesmata
E)   Adhering junctions

Question 2

Most plasmodesmata contain a narrow cylindrical structure, called the desmotubule, which runs through the channel and connects the smooth ER of the two adjacent cells.

Accepted Answer

A) True 
 B)False

Question 3

The sodium-potassium pump is a carrier protein that maintains a(n)  ____ gradient across the plasma membrane.

Accepted Answer

A)   polar
B)   nonpolar
C)   phosphorous
D)   concentration
E)   electrochemical

Question 4

Sketch and label a tight junction, desmosome, and gap junction.

Accepted Answer

Sure, I can describe and label each of t...

Question 5

In cells that are constantly involved in secretion, an equivalent amount of membrane must be returned to the interior of the cell for each vesicle that fuses with the plasma membrane; if this does not occur, then what would happen?

Accepted Answer

A)   The cell surface would shrivel.
B)   The cell surface will keep expanding.
C)   The surface area would remain constant.
D)   The number of membrane receptor proteins would decrease.
E)   The ratio of cell surface would decrease, compared to cell volume.

Question 6

How do gap junctions differ from desmosomes?

Accepted Answer

A)   A gap junction bridges the space between cells.
B)   A gap junction is a much larger space between cells.
C)   A gap junction provides communication between cells.
D)   A gap junction can control the passage of materials between cells.
E)   A gap junction requires the use of ATP to open and close its channels.

Question 7

Which proteins are located on the inner or outer surface of the plasma membrane, usually bound to exposed regions of integral proteins by noncovalent interactions?

Accepted Answer

A)   Plasma membrane proteins
B)   Biological membrane proteins
C)   Transmembrane proteins
D)   Peripheral membrane proteins
E)   Integral membrane proteins

Question 8

Since sodium-potassium pumps transport sodium ions out of a cell and potassium ions into a cell, what type of carrier proteins are they?

Accepted Answer

A)   Ion pumps
B)   Uniporters
C)   Symporters
D)   Antiporters
E)   ABC transporter

Question 9

Compare and contrast the mechanisms of the hydrogen pump and glucose-sodium cotransport systems.

Accepted Answer

Concepts to Consider: Role of ...

Question 10

A patient who has had a severe hemorrhage accidentally receives a large transfusion of distilled water directly into a major blood vessel. What effect will this have on the patient?

Accepted Answer

A)   It will have no unfavorable effect as long as the water is free from bacteria.
B)   It will have serious, perhaps fatal consequences because there would be too much fluid to pump.
C)   It will have serious, perhaps fatal consequences because the red blood cells could shrink.
D)   It will have serious, perhaps fatal consequences because the red blood cells could swell and burst.
E)   It will have no serious effect because the kidney could quickly eliminate excess water.

Question 11

What is the passive movement of water along a concentration gradient?

Accepted Answer

A)   Osmosis
B)   Cotransport
C)   Plasmolysis
D)   Simple diffusion
E)   Facilitated diffusion

Question 12

Cotransport systems directly provide energy for active transport of solutes.

Accepted Answer

A) True 
 B)False

Question 13

Fluid that has a higher osmotic pressure than a cell is called ___________.

Accepted Answer

A)   hypotonic
B)   hypertonic
C)   turgor pressure
D)   isotonic
E)   plasmolysis

Question 14

Compare simple diffusion, osmosis, and facilitated diffusion. Identify examples for each.

Accepted Answer

Simple diffusion, osmosis, and facilitat...

Question 15

Sketch and label a typical cell membrane. Provide a brief explanation for each of the labeled structures.

Accepted Answer

The cell membrane is composed of a phosp...

Question 16

A transmembrane protein differs from other membrane proteins because

Accepted Answer

A)   it completely extends through the membrane.
B)   it is a glycoprotein with carbohydrates attached.
C)   it is completely embedded within the membrane.
D)   it is attached to the inside of the membrane by an ionic bond.
E)   it is covalently linked to the outer surface of the plasma membrane.

Question 17

Which cellular mechanism ejects products, such as hormones, by the fusion of a vesicle with the plasma membrane?

Accepted Answer

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

Question 18

Figure 5-3 ​

In the accompanying figure, what is the role of the structures between the membranes?

Accepted Answer

A)   They provide structure to plant cells.
B)   They provide anchorage points between adjacent cells.
C)   They allow passage of materials through intercellular spaces.
D)   They prevent the passage of materials through intercellular spaces.
E)   They allow the transport of small molecules and ions between adjacent cells.

Question 19

The role of ATP in the sodium-potassium pump is

Accepted Answer

A)   to transfer Na+ to the inside of a cell.
B)   to assist a Na+ to bind to a carbohydrate.
C)   to transfer Na+ to the outside of a cell.
D)   to assist a cell to release Na+ by exocytosis.
E)   to assist a cell to take up Na+ by endocytosis.

Question 20

Which statement about lipid bilayers is false ?

Accepted Answer

A)   They are inflexible.
B)   They are self-sealing.
C)   They resist forming free ends.
D)   They can fuse with other bilayers.
E)   They spontaneously form closed vesicles.

Exam 5: Biological Membranes

Most plasmodesmata contain a narrow cylindrical structure, called the desmotubule, which runs through the channel and connects the smooth ER of the two adjacent cells.

Correct AnswerverifiedShow Answer

How do gap junctions differ from desmosomes?

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Sketch and label a typical cell membrane. Provide a brief explanation for each of the labeled structures.

Correct AnswerAnswered by ExamLex AIThe cell membrane is composed of a phosp...View AnswerShow Answer

Which cellular mechanism ejects products, such as hormones, by the fusion of a vesicle with the plasma membrane?

Correct AnswerverifiedShow Answer

A patient who has had a severe hemorrhage accidentally receives a large transfusion of distilled water directly into a major blood vessel. What effect will this have on the patient?

Correct AnswerverifiedShow Answer

In cells that are constantly involved in secretion, an equivalent amount of membrane must be returned to the interior of the cell for each vesicle that fuses with the plasma membrane; if this does not occur, then what would happen?

Correct AnswerverifiedShow Answer

Fluid that has a higher osmotic pressure than a cell is called ___________.

Correct AnswerverifiedShow Answer

A transmembrane protein differs from other membrane proteins because

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The role of ATP in the sodium-potassium pump is

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Compare and contrast the mechanisms of the hydrogen pump and glucose-sodium cotransport systems.

Correct AnswerverifiedConcepts to Consider: Role of ...View AnswerShow Answer

Compare simple diffusion, osmosis, and facilitated diffusion. Identify examples for each.

Correct AnswerverifiedSimple diffusion, osmosis, and facilitat...View AnswerShow Answer

Sketch and label a tight junction, desmosome, and gap junction.

Correct AnswerAnswered by ExamLex AISure, I can describe and label each of t...View AnswerShow Answer

The sodium-potassium pump is a carrier protein that maintains a(n) ____ gradient across the plasma membrane.

Correct AnswerverifiedShow Answer

Which statement about lipid bilayers is false ?

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Cotransport systems directly provide energy for active transport of solutes.

Correct AnswerverifiedShow Answer

What type of cellular junction cements cells together that use cadherins as a belt around each cell?

Correct AnswerverifiedShow Answer

Since sodium-potassium pumps transport sodium ions out of a cell and potassium ions into a cell, what type of carrier proteins are they?

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What is the passive movement of water along a concentration gradient?

Correct AnswerverifiedShow Answer

Figure 5-3 ​ In the accompanying figure, what is the role of the structures between the membranes?

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Which proteins are located on the inner or outer surface of the plasma membrane, usually bound to exposed regions of integral proteins by noncovalent interactions?

Correct AnswerverifiedShow Answer

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The cell membrane is composed of a phosp...
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Concepts to Consider: Role of ...
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Simple diffusion, osmosis, and facilitat...
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Sure, I can describe and label each of t...
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Figure 5-3 In the accompanying figure, what is the role of the structures between the membranes?

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