Question 1

Glycoproteins and glycolipids are examples of _________________ associated with the cell membrane.

Accepted Answer

A)  organelles
B)  phospholipids
C)  cell surface markers
D)  cytoskeletal fibersE) A) and D)
F) B) and D)

Question 2

Diapedesis is the movement of white blood cells through intact blood vessel walls into surrounding body tissue.It typically happens when an area of the body is injured or damaged,and an inflammation response is required.What role would you expect cell adhesion molecules to play in this process?

Accepted Answer

A)  Cell adhesion molecules will allow the white blood cells to cling to one another to form a migrating clot.
B)  Cell adhesion molecules help white blood cells adhere to the blood vessel wall so that they can migrate across the wall and infiltrate into the underlying tissue.
C)  Cell adhesion molecules will allow the white blood cells to attach to the injured area.D) B) and C)
E) None of the above

Question 3

In individuals with normal blood sugar levels,glucose is reabsorbed into the bloodstream in the kidney by members of the GLUT transporter family,which form an aqueous pore across the membrane through which glucose can move in a passive manner.As a result,no glucose is excreted in urine.However,in people with untreated diabetes mellitus,blood sugar levels are high and glucose is often present in the urine.Which of the following best explains this occurrence?

Accepted Answer

A)  High blood glucose levels reverse the concentration gradient,allowing untransported glucose to be excreted in urine.
B)  High blood glucose levels interfere with the coupled transport of water and glucose,allowing untransported glucose to be excreted in urine.
C)  The GLUT transporters become saturated,allowing untransported glucose to be excreted in urine.
D)  The GLUT transporters cannot hydrolyze ATP quickly enough for ATP to transport the extra glucose,thereby allowing untransported glucose to be excreted in urine.E) B) and C)
F) B) and D)

Question 4

Which of the following does not influence membrane fluidity?

Accepted Answer

A)  a decrease in temperature
B)  the addition of cholesterol
C)  hydrogen bonding of water holding the membrane together
D)  introduction of double bonds into fatty acidsE) B) and C)
F) A) and B)

Question 5

If you were a very thirsty cell,which process would you use to take in some nutrients secreted by one of your neighbors?

Accepted Answer

A)  phagocytosis
B)  pinocytosis
C)  receptor-mediated endocytosis
D)  exocytosisE) A) and B)
F) B) and D)

Question 6

If you were to replace the phosphate group of a phospholipid with a fatty acid chain,you would have

Accepted Answer

A)  glycerol.
B)  a triglyceride.
C)  cholesterol.
D)  glycolipiD.E) All of the above
F) A) and B)

Question 7

If a cell has the same concentration of dissolved molecules as of its outside environment,the cell's condition is called as being

Accepted Answer

A)  isotonic.
B)  hypertonic.
C)  hypotoniC.
D)  hydrophobic.
E)  hydrophilic.F) B) and C)
G) A) and B)

Question 8

In bacteria,fungi,and plants the high internal pressure generated by osmosis is counteracted by the mechanical strength of their

Accepted Answer

A)  plasma membranes.
B)  organelles.
C)  cytoskeletons.
D)  cell walls.
E)  flagella.F) C) and E)
G) B) and C)

Question 9

Facilitated diffusion is an important method for cells in obtaining necessary molecules and removing other ones.Requirements for facilitated diffusion include which of the following?

Accepted Answer

A)  The carrier molecule must be specific to the molecule that is transported.The direction of movement is always with the concentration gradient,never against the gradient.
B)  The carrier molecule is nonspecific to the molecule that is transported.The direction of movement is always with the concentration gradient,never against the gradient.
C)  The carrier molecule is nonspecific to the molecule that is transported.The direction of movement is always against the concentration gradient,never with the gradient.
D)  The carrier molecule must be specific to the molecule that is transported and an ATP molecule must be attached to the specific carrier.The direction of movement is always against the concentration gradient,never with the gradient.E) C) and D)
F) All of the above

Question 10

Cholesterol functions in the plasma membrane to

Accepted Answer

A)  transport ions.
B)  serve as an energy molecule.
C)  maintain fluidity.
D)  mediate steroid action.
E)  maintain hypertension.F) C) and D)
G) B) and D)

Question 11

The following are all functions of a typical plasma membrane except

Accepted Answer

A)  transport of water and bulk material.
B)  selective transport of certain molecules and material.
C)  reception of information.
D)  expression of cellular identity.
E)  permanence in composition.F) A) and E)
G) C) and D)

Question 12

While water continually orients phospholipids into a lipid bilayer,it does not fix the lipids permanently into position.Thus,the bilayer is considered to be _______ in nature.

Accepted Answer

A)  static
B)  fluid
C)  fluctuating
D)  chargedE) A) and D)
F) A) and C)

Question 13

As a scientist you perform an experiment in which you create an artificial cell with a selectively permeable membrane through which only water can pass.You put a 5M solution of glucose into the cell and you place that into a beaker of water.What observations do you expect to see?

Accepted Answer

A)  Water moves out of the cell.
B)  Glucose moves out of the cell.
C)  No net change in cell weight.
D)  Water moves into the cell.
E)  Glucose moves into the cell.F) B) and C)
G) A) and E)

Question 14

The part of a membrane protein that extends through the phospholipid bilayer is primarily composed of amino acids that are

Accepted Answer

A)  highly polar.
B)  negatively charged.
C)  non-polar.
D)  positively chargeD.
E)  water solublE.F) B) and E)
G) C) and D)

Question 15

If a blood research laboratory is attempting to collect the content of human red blood cells,the researchers should use which of the following types of solutions to cause blood cell lysis (bursting) ?

Accepted Answer

A)  hyperosmotic
B)  isosmotic
C)  hypoosmotic
D)  osmoticE) A) and C)
F) A) and D)

Question 16

If a cell has a normal osmotic pressure of 4500 mmHg and is placed into a solution with an osmotic pressure of 3500 mmHg,what will happen to the cell?

Accepted Answer

A)  The cell will lose water and its osmotic pressure will decrease.
B)  .The cell will gain water and its osmotic pressure will decrease.
C)  The cell will lose water and its osmotic pressure will increase
D)  The cell will lose water and its osmotic pressure will increase.E) B) and C)
F) All of the above

Question 17

Which of the following is not a part of the sodium-potassium pump?

Accepted Answer

A)  Three sodium ions bind to the cytoplasmic side of the protein.
B)  Three sodium ions are translocated out of the cell.
C)  Phosphate facilitates potassium ion binding to transport protein.
D)  Two potassium ions are transported into the cell.
E)  ATP binds to the protein which becomes phosphorylated (ADP is released) .F) B) and D)
G) A) and B)

Question 18

The turgor pressure observed in plants is a direct result of the plant cells being _________________ to their environment.

Accepted Answer

A)  hypoosmotic
B)  isosmotic
C)  osmosis
D)  hyperosmoticE) B) and D)
F) A) and C)

Exam 5: Membranes

If a blood research laboratory is attempting to collect the content of human red blood cells,the researchers should use which of the following types of solutions to cause blood cell lysis (bursting) ?

Correct Answer
verified

Which of the following is not a part of the sodium-potassium pump?

Correct Answer
verified

If you were a very thirsty cell,which process would you use to take in some nutrients secreted by one of your neighbors?

Correct Answer
verified

Facilitated diffusion is an important method for cells in obtaining necessary molecules and removing other ones.Requirements for facilitated diffusion include which of the following?

Correct Answer
verified

As a scientist you perform an experiment in which you create an artificial cell with a selectively permeable membrane through which only water can pass.You put a 5M solution of glucose into the cell and you place that into a beaker of water.What observations do you expect to see?

Correct Answer
verified

If you were to replace the phosphate group of a phospholipid with a fatty acid chain,you would have

Correct Answer
verified

If a cell has a normal osmotic pressure of 4500 mmHg and is placed into a solution with an osmotic pressure of 3500 mmHg,what will happen to the cell?

Correct Answer
verified

While water continually orients phospholipids into a lipid bilayer,it does not fix the lipids permanently into position.Thus,the bilayer is considered to be _______ in nature.

Correct Answer
verified

The turgor pressure observed in plants is a direct result of the plant cells being _________________ to their environment.

Correct Answer
verified

In bacteria,fungi,and plants the high internal pressure generated by osmosis is counteracted by the mechanical strength of their

Correct Answer
verified

Diapedesis is the movement of white blood cells through intact blood vessel walls into surrounding body tissue.It typically happens when an area of the body is injured or damaged,and an inflammation response is required.What role would you expect cell adhesion molecules to play in this process?

Correct Answer
verified

Which of the following does not influence membrane fluidity?

Correct Answer
verified

Correct Answer
verified

Cholesterol functions in the plasma membrane to

Correct Answer
verified

The following are all functions of a typical plasma membrane except

Correct Answer
verified

Glycoproteins and glycolipids are examples of _________________ associated with the cell membrane.

Correct Answer
verified

If a cell has the same concentration of dissolved molecules as of its outside environment,the cell's condition is called as being

Correct Answer
verified

The part of a membrane protein that extends through the phospholipid bilayer is primarily composed of amino acids that are

Correct Answer
verified

Exam 5: Membranes

If a blood research laboratory is attempting to collect the content of human red blood cells,the researchers should use which of the following types of solutions to cause blood cell lysis (bursting) ?

Correct AnswerverifiedShow Answer

Which of the following is not a part of the sodium-potassium pump?

Correct AnswerverifiedShow Answer

If you were a very thirsty cell,which process would you use to take in some nutrients secreted by one of your neighbors?

Correct AnswerverifiedShow Answer

Facilitated diffusion is an important method for cells in obtaining necessary molecules and removing other ones.Requirements for facilitated diffusion include which of the following?

Correct AnswerverifiedShow Answer

As a scientist you perform an experiment in which you create an artificial cell with a selectively permeable membrane through which only water can pass.You put a 5M solution of glucose into the cell and you place that into a beaker of water.What observations do you expect to see?

Correct AnswerverifiedShow Answer

If you were to replace the phosphate group of a phospholipid with a fatty acid chain,you would have

Correct AnswerverifiedShow Answer

If a cell has a normal osmotic pressure of 4500 mmHg and is placed into a solution with an osmotic pressure of 3500 mmHg,what will happen to the cell?

Correct AnswerverifiedShow Answer

While water continually orients phospholipids into a lipid bilayer,it does not fix the lipids permanently into position.Thus,the bilayer is considered to be _______ in nature.

Correct AnswerverifiedShow Answer

The turgor pressure observed in plants is a direct result of the plant cells being _________________ to their environment.

Correct AnswerverifiedShow Answer

In bacteria,fungi,and plants the high internal pressure generated by osmosis is counteracted by the mechanical strength of their

Correct AnswerverifiedShow Answer

Diapedesis is the movement of white blood cells through intact blood vessel walls into surrounding body tissue.It typically happens when an area of the body is injured or damaged,and an inflammation response is required.What role would you expect cell adhesion molecules to play in this process?

Correct AnswerverifiedShow Answer

Which of the following does not influence membrane fluidity?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Cholesterol functions in the plasma membrane to

Correct AnswerverifiedShow Answer

The following are all functions of a typical plasma membrane except

Correct AnswerverifiedShow Answer

Glycoproteins and glycolipids are examples of _________________ associated with the cell membrane.

Correct AnswerverifiedShow Answer

If a cell has the same concentration of dissolved molecules as of its outside environment,the cell's condition is called as being

Correct AnswerverifiedShow Answer

The part of a membrane protein that extends through the phospholipid bilayer is primarily composed of amino acids that are

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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