Question 1

Why are primary active transporters many times called ATPases?

Accepted Answer

A)  They must first bind to an ATP molecule before binding any transported molecule.
B)  ATP is the universal currency to get work done in the cell.
C)  ATP is synthesized during the reverse reaction and is named for that ability.
D)  They often breakdown ATP to AMP and pyrophosphate (an ATPase activity) .
E)  They act as enzymes to release energy from ATP.F) A) and D)
G) A) and C)

Question 2

What transport process couples the movement of an ion against its electrochemical gradient to another ion that is moving down its electrochemical gradient that was established using cellular energy (ATP) ?

Accepted Answer

A)  primary active transport
B)  secondary active transport
C)  tertiary passive transport
D)  primary passive transport
E)  secondary passive transportF) C) and D)
G) A) and D)

Question 3

Which condition exists when there are more solutes present in a solution?

Accepted Answer

A)  There is a greater pressure for water to leave.
B)  There is a lower thermal energy affecting diffusion.
C)  There is a greater concentration of water to leave that solution.
D)  There is a lower concentration of water in that solution.
E)  There is a greater need for an active transporter.F) None of the above
G) A) and C)

Question 4

When white blood cells are called to an area of infection, not only is there phagocytosis taking place, but also exocytosis of undigested particles from the white blood cells into the interstitial space. What effect does this have on water in the surrounding cells and capillary plasma?

Accepted Answer

A)  It creates a hypertonic environment, drawing water from the surrounding cells and plasma.
B)  These particles have no effect on tonicity, since their precursors were already in the body.
C)  It dehydrates the area due to the increase in lysosomal waste products.
D)  Swelling of the nearby cells and plasma ensues due to the hypotonic nature of the area.
E)  Plasma water moves to the interstitium by osmosis and then into the adjacent cells.F) C) and D)
G) C) and E)

Question 5

In epithelial tissue, the portion of the plasma membrane facing the lumen is called the membrane. The portion of the plasma membrane facing the connective tissue/interstitial fluid is called the membrane.

Accepted Answer

A)  luminal : interstitial
B)  apical : basement
C)  apical : basolateral
D)  secretory : attachment
E)  epithelial : basementF) D) and E)
G) All of the above

Question 6

The potassium equilibrium potential is - 94 mV. What does this mean?

Accepted Answer

A)  At the resting membrane potential of neurons, potassium is at equilibrium.
B)  At - 94 mV, potassium movement is opposed exactly by sodium movement.
C)  At - 94 mV, the chemical force for potassium movement is zero.
D)  At - 94 mV, the chemical force for potassium movement is opposed exactly by the electrical force.
E)  At - 94 mV, the electrical force for potassium movement is zero.F) A) and C)
G) B) and D)

Question 7

If the concentration of sodium in the extracellular fluid increased, then the equilibrium potential would (become more positive/become less positive/remain the same).

Accepted Answer

become mor...

Question 8

Based solely upon its electrical charge, the inside of a typical cell will tend to attract extracellular to move inward.

Accepted Answer

A)  proteins
B)  cations
C)  anions
D)  ions whose concentration gradient allows them
E)  uncharged ionsF) C) and D)
G) All of the above

Question 9

All of the following solutes are found in higher concentration inside of the cell EXCEPT

Accepted Answer

A)  ATP.
B)  glucose.
C)  phosphate.
D)  calcium.
E)  potassium.F) A) and D)
G) B) and E)

Question 10

Endocytosis is a form of active transport (requiring energy) to move vesicles

Accepted Answer

A)  containing fluids into and out of the cell, also known as pinocytosis.
B)  filled with particles and/or fluids out of the cell.
C)  containing particles into and out of the cell, also known as phagocytosis.
D)  filled with particles and/or fluids into the cell.
E)  containing proteins out of the cell, also known as secretion.F) A) and E)
G) A) and C)

Question 11

If there is a difference in osmolarity between a cell and its environment, water will move its osmotic pressure gradient.

Accepted Answer

A)  through
B)  down
C)  between
D)  up
E)  acrossF) A) and D)
G) B) and E)

Question 12

Describe the process of facilitated diffusion and the proteins involved in that process.

Accepted Answer

Facilitated diffusion describes a proces...

Question 13

Insulin triggers the insert of what protein into the cell membrane of its target cell?

Accepted Answer

A)  hexose- 6- kinase
B)  insulin- like growth factor 1
C)  glucagon
D)  GLUT4
E)  insulin- like growth factor receptorF) D) and E)
G) All of the above

Question 14

In epithelial transport, movement from the internal environment to the external environment is called , whereas movement from the external environment to the internal environment is called .

Accepted Answer

A)  absorption : excretion
B)  catch : release
C)  secretion : absorption
D)  pinocytosis : exocytosis
E)  excretion : ingestionF) B) and C)
G) D) and E)

Question 15

If there is 0.2 M glucose along with 0.15 M NaCl in solution, what is the osmolarity of this solution?

Accepted Answer

A)  2) 15 Osm
B)  300 mOsm
C)  2) 30 Osm
D)  350 mOsm
E)  500 mOsmF) B) and D)
G) B) and C)

Question 16

When the Na+/ K+ pump moves its bound molecules of Na+ to the outside of the membrane, it

Accepted Answer

A)  immediately returns to the inside of the cell, ready to transport more Na+ back outside.
B)  pumps more K+ back into the cell than the amount of Na+ that just came out.
C)  binds to ATP to release the energy required to power the return trip.
D)  cannot return to the inside empty- handed, so it must bind two K+ first.
E)  releases the bound ATP to return to its normal confirmation.F) A) and D)
G) D) and E)

Question 17

Which of the following transport mechanisms has no energy requirement?

Accepted Answer

A)  exocytosis
B)  active transport
C)  osmosis through aquaporins
D)  secondary active transport
E)  endocytosisF) B) and E)
G) D) and E)

Question 18

What is the primary role for the Na+/ K+ pump?

Accepted Answer

A)  to create a polarized membrane in an excitable cell
B)  to produce ATP while pumping Na+ and K+ against their concentration gradients
C)  to pump Na+ and K+ down their concentration gradients out of the cell
D)  the maintenance of Na+ and K+ concentrations once inside the membrane
E)  the maintenance of Na+ and K+ concentrations on either side of the membraneF) A) and D)
G) A) and C)

Question 19

The extent of ion movement through the space between epithelial cells is determined by the extent of coupling between neighboring epithelial cells.

Accepted Answer

A)  paracellular : tight junctional
B)  transcellular : tight junctional
C)  paracellular : gap junctional
D)  transcellular : desmosomal
E)  transcellular : gap junctionalF) C) and D)
G) B) and D)

Question 20

Assuming that for K+ (higher concentration inside cell), EK+ = - 90 mV and Vm is - 70 mV, the (electrical gradient/chemical gradient)is larger in magnitude.

Accepted Answer

The answer of Assuming that for K+ (higher concentration inside...

Exam 4: Cell Membrane Transport

Which condition exists when there are more solutes present in a solution?

Correct AnswerverifiedShow Answer

The extent of ion movement through the space between epithelial cells is determined by the extent of coupling between neighboring epithelial cells.

Correct AnswerverifiedShow Answer

In epithelial tissue, the portion of the plasma membrane facing the lumen is called the membrane. The portion of the plasma membrane facing the connective tissue/interstitial fluid is called the membrane.

Correct AnswerverifiedShow Answer

Endocytosis is a form of active transport (requiring energy) to move vesicles

Correct AnswerverifiedShow Answer

Assuming that for K+ (higher concentration inside cell), EK+ = - 90 mV and Vm is - 70 mV, the (electrical gradient/chemical gradient)is larger in magnitude.

Correct AnswerverifiedShow Answer

If there is 0.2 M glucose along with 0.15 M NaCl in solution, what is the osmolarity of this solution?

Correct AnswerverifiedShow Answer

Insulin triggers the insert of what protein into the cell membrane of its target cell?

Correct AnswerverifiedShow Answer

What is the primary role for the Na+/ K+ pump?

Correct AnswerverifiedShow Answer

If the concentration of sodium in the extracellular fluid increased, then the equilibrium potential would (become more positive/become less positive/remain the same).

Correct Answerverifiedbecome mor...View AnswerShow Answer

All of the following solutes are found in higher concentration inside of the cell EXCEPT

Correct AnswerverifiedShow Answer

If there is a difference in osmolarity between a cell and its environment, water will move its osmotic pressure gradient.

Correct AnswerverifiedShow Answer

When the Na+/ K+ pump moves its bound molecules of Na+ to the outside of the membrane, it

Correct AnswerverifiedShow Answer

Describe the process of facilitated diffusion and the proteins involved in that process.

Correct AnswerverifiedFacilitated diffusion describes a proces...View AnswerShow Answer

Based solely upon its electrical charge, the inside of a typical cell will tend to attract extracellular to move inward.

Correct AnswerverifiedShow Answer

What transport process couples the movement of an ion against its electrochemical gradient to another ion that is moving down its electrochemical gradient that was established using cellular energy (ATP) ?

Correct AnswerverifiedShow Answer

The potassium equilibrium potential is - 94 mV. What does this mean?

Correct AnswerverifiedShow Answer

In epithelial transport, movement from the internal environment to the external environment is called , whereas movement from the external environment to the internal environment is called .

Correct AnswerverifiedShow Answer

When white blood cells are called to an area of infection, not only is there phagocytosis taking place, but also exocytosis of undigested particles from the white blood cells into the interstitial space. What effect does this have on water in the surrounding cells and capillary plasma?

Correct AnswerverifiedShow Answer

Why are primary active transporters many times called ATPases?

Correct AnswerverifiedShow Answer

Which of the following transport mechanisms has no energy requirement?

Correct AnswerverifiedShow Answer

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become mor...
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Facilitated diffusion describes a proces...
View Answer

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