Question 1

The plasma membrane Na+/K+-ATPase pump

Accepted Answer

A)  is used to generate sodium and potassium gradients across the membrane.
B)  is a symporter.
C)  is a pump for active transport of K+ out of the cell and Na+ into the cell.
D)  is a pump for facilitated diffusion of K+ into the cell and Na+ out of the cell.
E)  does not require ATP.F) B) and D)
G) B) and C)

Question 2

________ bind two or more ions or molecules and transport them in opposite directions across a membrane.

Accepted Answer

A)  Uniporters
B)  Symporters
C)  Antiporters
D)  Dual transporters
E)  Channel pumpsF) D) and E)
G) None of the above

Question 3

The movement of sucrose and H+ into the cell by the same membrane protein reflects the actions of what type of transporter?

Accepted Answer

A)  Voltage-gated channel.
B)  Mechanosensitive channel.
C)  Uniporter.
D)  Symporter.
E)  Antiporter.F) C) and E)
G) All of the above

Question 4

The pressure required to stop water from moving across the membrane by osmosis is called

Accepted Answer

A)  transport pressure.
B)  crenation pressure.
C)  atmospheric pressure.
D)  osmotic pressure.
E)  mechanical pressurE.F) A) and D)
G) B) and D)

Question 5

An artificial membrane vesicle is mixed with several peripheral membrane proteins and analyzed by freeze-fracture electron microscopy.What will be seen in the resulting image?

Accepted Answer

A)  Bumps will be visible on both layers
B)  Bumps will be visible only in the extracellular face (E face) 
C)  Bumps will be visible in the protoplasmic face (P face) 
D)  No bumps will be visible in either faceE) A) and C)
F) B) and D)

Question 6

The best descriptive comparison between hemidesmosomes and desmosomes is

Accepted Answer

A)  hemidesmosomes are anchorage junctions but desmosomes are not.
B)  hemidesmosomes are found in plant cells while desmosomes are found in animal cells.
C)  both hemidesmosomes and desmosomes associate with integrin,but not cadherin molecules.
D)  hemidesmosomes interact with actin filaments while desmosomes interact with intermediate filaments.
E)  hemidesmosomes anchor cells to the ECM while desmosomes anchor cells to other cells.F) C) and D)
G) C) and E)

Question 7

Unlike animals,plants lack a cell junction where small molecules can move from one cell to another cell.

Accepted Answer

A) True 
 B)False

Question 8

Gap junctions in animal cells are most similar to ________ in plant cells?

Accepted Answer

A)  tight junctions
B)  hemidesmosomes
C)  plasmodesmata
D)  middle lamella
E)  primary cell wallsF) A) and B)
G) A) and E)

Question 9

A drug company wants to design a medicine that will bind to surface proteins and initiate a conformational change allowing the drug to enter.You suggest the study focus on

Accepted Answer

A)  channels.
B)  pumps.
C)  transporters.
D)  receptors.E) A) and B)
F) None of the above

Question 10

How might a plant cell compensate for the excessive membrane fluidity that occurs during prolonged exposures to elevated temperature?

Accepted Answer

A)  Reduce membrane cholesterol content.
B)  Alter the lipid composition to have longer fatty acyl tails and fewer double bonds.
C)  Alter the lipid composition to have shorter fatty acyl tails and more double bonds.
D)  Alter the lipid composition to have shorter and more unsaturated fatty acyl tails.
E)  Reduce cholesterol content and alter the lipid composition to have shorter fatty acyl tails.F) A) and C)
G) A) and D)

Question 11

Osmosis describes the movement of water from an area of high to low solute concentration.

Accepted Answer

A) True 
 B)False

Question 12

Cellular membranes are mosaic and

Accepted Answer

A)  fluid.
B)  rigid.
C)  symmetrical.
D)  highly permeable to large molecules.
E)  polar.F) C) and D)
G) B) and D)

Question 13

If contents of the intestines can leak into the blood then ______ must have been damaged.

Accepted Answer

A)  focal adhesions
B)  tight junctions
C)  desmosomes
D)  gap junctions
E)  hemidesmosomesF) B) and D)
G) B) and E)

Question 14

A researcher is studying the integral membrane protein "mysteriase" and chooses to perform an experiment similar to that performed by Frye and Edidin.The researcher fuses a mouse cell expressing mysteriase with a human cell.The fused cell is incubated at 37 ∘\circ∘ C prior to being cooled to 0 ∘\circ∘ C and labeled with a fluorescent antibody against mysteriase.When observed with a fluorescent microscope,mysteriase is observed to remain on one side of the fused cell.What is the most likely explanation for this surprising observation?

Accepted Answer

A)  Mysteriase rigidifies the plasma membrane
B)  There is an error in the experimental procedure because this result is impossible
C)  Mysteriase is bound to the cytoskeletal filament
D)  Mouse cells are less fluid than human cells
E)  Mysteriase is a flippase enzyme that enhances lipid flip-flop rather than lipid lateral movement F) C) and E)
G) C) and D)

Question 15

Passive diffusion

Accepted Answer

A)  is the process by which molecules move from an area of low concentration to an area of high concentration.
B)  is a spontaneous process.
C)  requires the presence of a transmembrane protein.
D)  will occur so long as the membrane is freely permeable to the solute.
E)  requires energy.F) A) and D)
G) A) and C)

Question 16

Movement of molecules down their concentration gradient can drive the movement of a different molecule against its concentration gradient.

Accepted Answer

A) True 
 B)False

Question 17

________ act as rivets anchoring adjacent cells together at spots throughout the cell.

Accepted Answer

A)  Focal adhesions
B)  Desmosomes
C)  Adherens junctions
D)  Hemidesmosomes
E)  FibronectinF) A) and C)
G) D) and E)

Question 18

You inject a dye into a cell and observe that it moves into adjacent cells.This would occur through _____.

Accepted Answer

A)  adherins junctions
B)  tight junctions
C)  desmosomes
D)  plasmodesmata
E)  gap junctionsF) C) and D)
G) None of the above

Question 19

Imagine that a cell can be treated with a drug that prevents proteins from undergoing large conformational changes.Which transport proteins would be unaffected by this drug treatment?

Accepted Answer

A)  Na+/K+ ATPase
B)  H+/sucrose symporter
C)  Fructose uniporter
D)  Aquaporin
E)  All transport proteins would be affectedF) All of the above
G) B) and E)

Question 20

Muscular dystrophy is caused by a mutation in the intracellular dystrophin that normally binds to the cytoskeleton.Dystrophin also binds to _______ ,which is found in the plasma membrane of the cell and binds the extra cellular matrix.

Accepted Answer

A)  a gap junction
B)  an integrin
C)  a cadherin
D)  a tight junction
E)  an actin filamentF) B) and E)
G) C) and E)

Exam 5: Membrane Structure, Transport, and Cell Junctions

Unlike animals,plants lack a cell junction where small molecules can move from one cell to another cell.

Correct Answer
verified

An artificial membrane vesicle is mixed with several peripheral membrane proteins and analyzed by freeze-fracture electron microscopy.What will be seen in the resulting image?

Correct Answer
verified

The best descriptive comparison between hemidesmosomes and desmosomes is

Correct Answer
verified

Passive diffusion

Correct Answer
verified

The plasma membrane Na⁺/K⁺-ATPase pump

Correct Answer
verified

Correct Answer
verified

Imagine that a cell can be treated with a drug that prevents proteins from undergoing large conformational changes.Which transport proteins would be unaffected by this drug treatment?

Correct Answer
verified

The pressure required to stop water from moving across the membrane by osmosis is called

Correct Answer
verified

How might a plant cell compensate for the excessive membrane fluidity that occurs during prolonged exposures to elevated temperature?

Correct Answer
verified

You inject a dye into a cell and observe that it moves into adjacent cells.This would occur through _____.

Correct Answer
verified

________ act as rivets anchoring adjacent cells together at spots throughout the cell.

Correct Answer
verified

The movement of sucrose and H⁺ into the cell by the same membrane protein reflects the actions of what type of transporter?

Correct Answer
verified

A drug company wants to design a medicine that will bind to surface proteins and initiate a conformational change allowing the drug to enter.You suggest the study focus on

Correct Answer
verified

If contents of the intestines can leak into the blood then ______ must have been damaged.

Correct Answer
verified

Movement of molecules down their concentration gradient can drive the movement of a different molecule against its concentration gradient.

Correct Answer
verified

________ bind two or more ions or molecules and transport them in opposite directions across a membrane.

Correct Answer
verified

Gap junctions in animal cells are most similar to ________ in plant cells?

Correct Answer
verified

Osmosis describes the movement of water from an area of high to low solute concentration.

Correct Answer
verified

Cellular membranes are mosaic and

Correct Answer
verified

Muscular dystrophy is caused by a mutation in the intracellular dystrophin that normally binds to the cytoskeleton.Dystrophin also binds to _______ ,which is found in the plasma membrane of the cell and binds the extra cellular matrix.

Correct Answer
verified

Exam 5: Membrane Structure, Transport, and Cell Junctions

Unlike animals,plants lack a cell junction where small molecules can move from one cell to another cell.

Correct AnswerverifiedShow Answer

An artificial membrane vesicle is mixed with several peripheral membrane proteins and analyzed by freeze-fracture electron microscopy.What will be seen in the resulting image?

Correct AnswerverifiedShow Answer

The best descriptive comparison between hemidesmosomes and desmosomes is

Correct AnswerverifiedShow Answer

Passive diffusion

Correct AnswerverifiedShow Answer

The plasma membrane Na+/K+-ATPase pump

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Imagine that a cell can be treated with a drug that prevents proteins from undergoing large conformational changes.Which transport proteins would be unaffected by this drug treatment?

Correct AnswerverifiedShow Answer

The pressure required to stop water from moving across the membrane by osmosis is called

Correct AnswerverifiedShow Answer

How might a plant cell compensate for the excessive membrane fluidity that occurs during prolonged exposures to elevated temperature?

Correct AnswerverifiedShow Answer

You inject a dye into a cell and observe that it moves into adjacent cells.This would occur through _____.

Correct AnswerverifiedShow Answer

________ act as rivets anchoring adjacent cells together at spots throughout the cell.

Correct AnswerverifiedShow Answer

The movement of sucrose and H+ into the cell by the same membrane protein reflects the actions of what type of transporter?

Correct AnswerverifiedShow Answer

A drug company wants to design a medicine that will bind to surface proteins and initiate a conformational change allowing the drug to enter.You suggest the study focus on

Correct AnswerverifiedShow Answer

If contents of the intestines can leak into the blood then ______ must have been damaged.

Correct AnswerverifiedShow Answer

Movement of molecules down their concentration gradient can drive the movement of a different molecule against its concentration gradient.

Correct AnswerverifiedShow Answer

________ bind two or more ions or molecules and transport them in opposite directions across a membrane.

Correct AnswerverifiedShow Answer

Gap junctions in animal cells are most similar to ________ in plant cells?

Correct AnswerverifiedShow Answer

Osmosis describes the movement of water from an area of high to low solute concentration.

Correct AnswerverifiedShow Answer

Cellular membranes are mosaic and

Correct AnswerverifiedShow Answer

Muscular dystrophy is caused by a mutation in the intracellular dystrophin that normally binds to the cytoskeleton.Dystrophin also binds to _______ ,which is found in the plasma membrane of the cell and binds the extra cellular matrix.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
verified

The plasma membrane Na⁺/K⁺-ATPase pump

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
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Correct Answer
verified

Correct Answer
verified

The movement of sucrose and H⁺ into the cell by the same membrane protein reflects the actions of what type of transporter?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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