Question 1

Which cell junction is unique to animals? v: 04_12_2014_QC_47498

Accepted Answer

A)   gap
B)   tight
C)   desmosomes
D)   all are unique to animals

Question 2

Which is the best definition of osmosis?

Accepted Answer

A)   The movement of molecules from an area of their higher concentration to an area of their lower concentration.
B)   The movement of water across a semi permeable membrane from an area of higher water concentration to an area of lower water concentration.
C)   The movement of molecules from an area of their lower concentration to an area of their higher concentration.
D)   The movement of water across a semi permeable membrane from an area of lower water concentration to an area of higher water concentration.
E)   The movement of a substance against its concentration gradient through the release of energy from ATP.

Question 3

Why do membranes self-assemble into their characteristic phospholipids bilayer?

Accepted Answer

Membranes self assemble in their charact...

Question 4

In a phospholipid bilayer, the

Accepted Answer

A)   phosphate groups are hydrophobic.
B)   fatty acid tails are ionized.
C)   fatty acid tails are hydrophilic.
D)   proteins are located only between the two layers.
E)   phosphate heads are oriented toward the exterior of the cell or toward the cytoplasm.

Question 5

A 10% glucose solution is placed in the thistle tube. The thistle tube is placed in a beaker that contains a 5% glucose solution. The solution in the thistle tube is _______ to the solution in the beaker.

Accepted Answer

A)   hypertonic
B)   hypotonic
C)   isotonic
D)   none of the answer choices

Question 6

Which scenario is most likely to occur if the mitochondria in the kidney cells were to decrease in function?

Accepted Answer

A)   The kidneys would improve in function.
B)   The kidneys would begin excreting large amounts of waste products.
C)   The amount of active transport in the kidneys would significantly decrease.
D)   The amount of active transport in the kidneys would increase.

Question 7

Which of the following is NOT associated with animal cells?

Accepted Answer

A)   an extracellular matrix
B)   plasmodesmata
C)   gap junctions
D)   adhesion junctions (desmosomes) 
E)   tight junctions

Question 8

Plants show turgor pressure when

Accepted Answer

A)   cells are losing water from their water vacuoles.
B)   cells contain water vacuoles that are full of water.
C)   water is being used up in photosynthesis.
D)   water is being evaporated from the leaves.

Question 9

If a living plant were moved from a freshwater aquarium to a saltwater aquarium, which of the following would occur?

Accepted Answer

A)   Nothing. The plant would be fine in either aquarium.
B)   The plant's cells would take on ions.
C)   The plant's cells would take on water and will lyse.
D)   The plant's cells would lose water and plasmolysis would occur.

Question 10

Which phrase does NOT describe one of the functions of proteins of the plasma membrane?

Accepted Answer

A)   forming a channel through the membrane
B)   initiating the replication of the genetic material
C)   binding to a substance to carry it through the membrane
D)   acting as a receptor for substances external to the cell
E)   increasing the rate of a chemical reaction

Question 11

Which type of molecule will require some amount of energy to cross the cell membrane?

Accepted Answer

A)   glycerol
B)   polar
C)   non-polar molecules
D)   carbon dioxide
E)   oxygen

Question 12

In the sodium-potassium pump, sodium is transported out of the cell and potassium is transported into the cell as ATP is broken by a membrane protein.

Accepted Answer

A) True 
 B)False

Question 13

Eukaryotic cells are substantially larger than bacterial cells and average over 20 times more volume-per-surface-area than bacterial cells. How can the eukaryotic cell membrane provide this higher rate of exchange of materials?

Accepted Answer

A)   Plasma membrane folds increase the surface area.
B)   Carrier proteins speed the rate at which a solute crosses the plasma membrane in the direction of decreasing concentration.
C)   Mitochondria are concentrated near membranes to provide energy for active transport of molecules or ions.
D)   Large molecules are engulfed by vesicle formation.
E)   All of the choices are correct.

Question 14

A crystal of green dye is added to a beaker of water. The dye will undergo diffusion. After studying the series of beakers from the left to the right, define diffusion and state the ultimate outcome of diffusion?

Accepted Answer

The dye is diffusing from an area of hig...

Question 15

Why can nonpolar molecules freely cross the cell membrane while polar molecules require energy?

Accepted Answer

Nonpolar molecules tend to be ...

Question 16

Red blood cells come in many "blood types" including type A, type B, type AB, type O [lacking proteins A and B], Rh positive, and Rh negative [lacking Rh+] and many others. If blood is transfused, the recipient detects any new or "foreign" proteins. These blood type proteins are

Accepted Answer

A)   in the plasma where they have been secreted by the red blood cells.
B)   inside the red blood cell cytoplasm.
C)   on the outer surface of the red blood cell membrane.
D)   evenly distributed throughout the cell contents and plasma.
E)   in the red blood cell nucleus.

Question 17

Which of the following is an example of active transport through a cell membrane?

Accepted Answer

A)   Movement of carbon dioxide out of the blood stream and into the lungs
B)   Movement of oxygen from the lungs into the bloodstream
C)   Movement of sweat onto the surface of your skin
D)   Absorption of glucose from the gut into the bloodstream

Question 18

Why does this model of a phospholipids bilayer in Fig. 1 not 'work'?

Accepted Answer

This model does not 'work' because it ha...

Question 19

If a cell is placed in a hypotonic solution, which will occur?

Accepted Answer

A)   Salts will move into the cell from the surrounding solution.
B)   Water will move into the cell from the surrounding solution.
C)   Salts will move out of the cell into the surrounding solution.
D)   Water will move out of the cell into the surrounding solution.
E)   None of the choices will occur.

Question 20

Which cell junction will allow the movement of molecules between two plant cells?

Accepted Answer

A)   plasmodesmata
B)   gap
C)   tight
D)   adhesion

Exam 5: Membrane Structure and Function

Which cell junction will allow the movement of molecules between two plant cells?

Correct AnswerverifiedShow Answer

Why does this model of a phospholipids bilayer in Fig. 1 not 'work'?

Correct AnswerverifiedThis model does not 'work' because it ha...View AnswerShow Answer

Plants show turgor pressure when

Correct AnswerverifiedShow Answer

Why can nonpolar molecules freely cross the cell membrane while polar molecules require energy?

Correct AnswerverifiedNonpolar molecules tend to be ...View AnswerShow Answer

Which type of molecule will require some amount of energy to cross the cell membrane?

Correct AnswerverifiedShow Answer

In a phospholipid bilayer, the

Correct AnswerverifiedShow Answer

Why do membranes self-assemble into their characteristic phospholipids bilayer?

Correct AnswerverifiedMembranes self assemble in their charact...View AnswerShow Answer

Eukaryotic cells are substantially larger than bacterial cells and average over 20 times more volume-per-surface-area than bacterial cells. How can the eukaryotic cell membrane provide this higher rate of exchange of materials?

Correct AnswerverifiedShow Answer

Which of the following is an example of active transport through a cell membrane?

Correct AnswerverifiedShow Answer

Which scenario is most likely to occur if the mitochondria in the kidney cells were to decrease in function?

Correct AnswerverifiedShow Answer

Which of the following is NOT associated with animal cells?

Correct AnswerverifiedShow Answer

A 10% glucose solution is placed in the thistle tube. The thistle tube is placed in a beaker that contains a 5% glucose solution. The solution in the thistle tube is _______ to the solution in the beaker.

Correct AnswerverifiedShow Answer

A crystal of green dye is added to a beaker of water. The dye will undergo diffusion. After studying the series of beakers from the left to the right, define diffusion and state the ultimate outcome of diffusion?

Correct AnswerverifiedThe dye is diffusing from an area of hig...View AnswerShow Answer

If a cell is placed in a hypotonic solution, which will occur?

Correct AnswerverifiedShow Answer

Which phrase does NOT describe one of the functions of proteins of the plasma membrane?

Correct AnswerverifiedShow Answer

If a living plant were moved from a freshwater aquarium to a saltwater aquarium, which of the following would occur?

Correct AnswerverifiedShow Answer

Which cell junction is unique to animals? v: 04_12_2014_QC_47498

Correct AnswerverifiedShow Answer

Which is the best definition of osmosis?

Correct AnswerverifiedShow Answer

In the sodium-potassium pump, sodium is transported out of the cell and potassium is transported into the cell as ATP is broken by a membrane protein.

Correct AnswerverifiedShow Answer

Red blood cells come in many "blood types" including type A, type B, type AB, type O [lacking proteins A and B], Rh positive, and Rh negative [lacking Rh+] and many others. If blood is transfused, the recipient detects any new or "foreign" proteins. These blood type proteins are

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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This model does not 'work' because it ha...
View Answer

Correct Answer
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Correct Answer
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Nonpolar molecules tend to be ...
View Answer

Correct Answer
verified

Correct Answer
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Correct Answer
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Membranes self assemble in their charact...
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Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
verified
The dye is diffusing from an area of hig...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Red blood cells come in many "blood types" including type A, type B, type AB, type O [lacking proteins A and B], Rh positive, and Rh negative [lacking Rh⁺] and many others. If blood is transfused, the recipient detects any new or "foreign" proteins. These blood type proteins are

Correct Answer
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