Question 1

The process by which a white blood cell or an amoeba engulfs bacteria is called phagocytosis.

Accepted Answer

A) True 
 B)False

Question 2

Sugars and amino acids are carried into the cell by means of

Accepted Answer

A)  facilitated transport.
B)  diffusion.
C)  endocytosis.
D)  exocytosis.E) A) and B)
F) C) and D)

Question 3

A major chemical that regulates the fluidity of animal cell membranes by stiffening the membrane at higher temperatures and preventing the membrane from freezing at lower temperature is:

Accepted Answer

A)  cholesterol.
B)  lipid in nature.
C)  a steroid.
D)  All of the choices are correct.E) A) and B)
F) A) and C)

Question 4

In the cell pictured,there is no net movement of water.The amount leaving the cell and entering the cell is the same.In what type of environment is this cell found?

Accepted Answer

A)  hypertonic
B)  hypotonic
C)  isotonic
D)  none of the aboveE) B) and D)
F) A) and B)

Question 5

What type of transport mechanism is required to move sodium ions against their concentration gradient?

Accepted Answer

A)  active
B)  passive
C)  diffusion
D)  osmosisE) None of the above
F) B) and D)

Question 6

A 10% glucose solution is placed in the thistle tube.The thistle tube is placed in a beaker that contains a 5% glucose solution.There is a differentially permeable membrane across the broad end of the tube,which is permeable to water but not to the sugar glucose.As diffusion occurs:

Accepted Answer

A)  the 10% solution will become more concentrated and the 5% solution will become less concentrated.
B)  both solutions will become more concentrated.
C)  the 10% solution will become less concentrated and the 5% solution will become more concentrated.
D)  both solutions will become less concentrated.E) A) and C)
F) All of the above

Question 7

Which of the following is true with respect to plant cell walls?

Accepted Answer

A)  They contain n-acetylglutamic acid.
B)  They all have secondary cell walls to some extent.
C)  There is a greater amount of cellulose in secondary cell walls than in primary cell walls.
D)  Lignin is found in primary cell walls of plants.E) B) and C)
F) A) and B)

Question 8

Which of the following protein functions is not correctly associated with its correct integral protein?

Accepted Answer

A)  carrier proteins-facilitate passage of molecules through the membrane
B)  enzymatic proteins-catalyze a specific reaction
C)  channel proteins-block the activity of carrier proteins
D)  cell recognition proteins-recognize pathogensE) C) and D)
F) B) and D)

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.E) A) and D)
F) All of the above

Question 10

Some parasites and disease agents regularly change their identity before our immune system can build up substantial antibodies.How could cells change their chemical identity on a regular basis?

Accepted Answer

A)  Rapid evolution produces mutations.
B)  A new phospholipid bilayer is generated to replace the old layer.
C)  Because the membrane is "set," the cell must reproduce and then the cell with the old membrane must die.
D)  Cells eliminate all surface proteins and present only a naked lipid bilayer.
E)  Different glycolipids and glycoproteins are produced internally and moved into the plasma membrane.F) D) and E)
G) B) and E)

Question 11

Freshwater protozoans react to a/an _____ environment by removing water through _____.

Accepted Answer

A)  hypertonic,turgor pressure
B)  hypotonic,turgor pressure
C)  isotonic,a contractile vacuole
D)  hypertonic,a contractile vacuole
E)  hypotonic,a contractile vacuoleF) A) and B)
G) A) and E)

Question 12

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 IncorrectE) All of the above
F) A) and B)

Question 13

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 junctionsF) All of the above
G) None of the above

Question 14

All life forms currently have a basic cell membrane so we presume that the earliest forms of life had this "fence" isolating the internal organization from the external chaos.It is likely that the primordial environment was acidic.In such a case,the cell membrane would have to include

Accepted Answer

A)  a sodium (Na+) pump.
B)  a proton (H+) pump.
C)  mitochondria underneath in order to provide energy for active transport.
D)  an acid-proof cell wall.
E)  a totally nonpermeable membrane.F) A) and E)
G) A) and B)

Question 15

Active transport

Accepted Answer

A)  requires an input of ATP.
B)  is involved in diffusion.
C)  occurs in osmosis and facilitated transport.
D)  All of the choices are correct.E) A) and B)
F) All of the above

Question 16

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

Accepted Answer

A)  plasmodesmata
B)  gap
C)  tight
D)  adhesionE) B) and C)
F) All of the above

Question 17

Which type of cellular process will most likely be used by an amoeba in order to obtain food?

Accepted Answer

A)  phagocytosis
B)  pinocytosis
C)  exocytosis
D)  receptor-mediated endocytosisE) None of the above
F) A) and D)

Question 18

Having similar ____________ would allow tissues and organs to be transplanted easily.

Accepted Answer

A)  cell recognition proteins
B)  major histocompatibility complex proteins
C)  carbohydrate chains in the cell membrane
D)  all of the choices are involved in tissue transplantationE) A) and B)
F) B) and C)

Question 19

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 reactionF) B) and C)
G) D) and E)

Question 20

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)  oxygenF) All of the above
G) A) and D)

Exam 5: Membrane Structure and Function

Some parasites and disease agents regularly change their identity before our immune system can build up substantial antibodies.How could cells change their chemical identity on a regular basis?

Correct AnswerverifiedShow Answer

Having similar ____________ would allow tissues and organs to be transplanted easily.

Correct AnswerverifiedShow Answer

Freshwater protozoans react to a/an _____ environment by removing water through _____.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following protein functions is not correctly associated with its correct integral protein?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is NOT associated with animal cells?

Correct AnswerverifiedShow Answer

Active transport

Correct AnswerverifiedShow Answer

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

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A major chemical that regulates the fluidity of animal cell membranes by stiffening the membrane at higher temperatures and preventing the membrane from freezing at lower temperature is:

Correct AnswerverifiedShow Answer

Which type of cellular process will most likely be used by an amoeba in order to obtain food?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What type of transport mechanism is required to move sodium ions against their concentration gradient?

Correct AnswerverifiedShow Answer

In the cell pictured,there is no net movement of water.The amount leaving the cell and entering the cell is the same.In what type of environment is this cell found?

Correct AnswerverifiedShow Answer

Sugars and amino acids are carried into the cell by means of

Correct AnswerverifiedShow Answer

The process by which a white blood cell or an amoeba engulfs bacteria is called phagocytosis.

Correct AnswerverifiedShow Answer

Which of the following is true with respect to plant cell walls?

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

A 10% glucose solution is placed in the thistle tube.The thistle tube is placed in a beaker that contains a 5% glucose solution.There is a differentially permeable membrane across the broad end of the tube,which is permeable to water but not to the sugar glucose.As diffusion occurs:

Correct AnswerverifiedShow Answer

All life forms currently have a basic cell membrane so we presume that the earliest forms of life had this "fence" isolating the internal organization from the external chaos.It is likely that the primordial environment was acidic.In such a case,the cell membrane would have to include

Correct AnswerverifiedShow Answer

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Freshwater protozoans react to a/an _ environment by removing water through _.

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