Question 1

Of the following molecules, which passes through a lipid bilayer most readily?

Accepted Answer

A)   carbon dioxide
B)   glucose
C)   K+
D)   arginine
E)   RNAF) B) and C)
G) C) and D)

Question 2

The Na+/K+-ATPase pump is a ligand-gated ion channel.

Accepted Answer

A) True 
 B)False  False

Question 3

Which of the following molecules would you predict moves through a lipid bilayer most rapidly?

Accepted Answer

A)   C6H12O6
B)   CH3OH
C)   C2H5OH
D)   C4H10
E)   NH2SO2CH3F) C) and D)
G) A) and B)

Question 4

Animal cells are permeable to water and urea but NOT to sucrose. The inside of a cell contains 1 M sucrose and 1 M urea and the outside 1 M sucrose and 2 M urea. The solution inside with respect to outside the cell is

Accepted Answer

A)   hypotonic.
B)   turgid.
C)   isotonic.
D)   saturated.
E)   hypertonic.F) A) and E)
G) A) and D) A

Question 5

Which of the following is NOT a function of cellular membranes?

Accepted Answer

A)   selective uptake and export of ions and molecules
B)   cell compartmentalization
C)   cell signaling
D)   maintenance of cell shape
E)   cell adhesionF) B) and D)
G) None of the above

Question 6

Which of the following is TRUE of phospholipids that flip-flop across the lipid bilayer?

Accepted Answer

A)   The process requires energy.
B)   The process occurs spontaneously, requiring no energy.
C)   The process requires an enzyme called flippase.
D)   The process requires energy and the flippase enzyme.
E)   The process occurs spontaneously and requires the flippase enzyme.F) A) and D)
G) A) and E)

Question 7

The current model that best describes biomembranes is the Rigid Mosaic Model.

Accepted Answer

A) True 
 B)False  False

Question 8

Which of the following organisms is likely to contain biomembranes?

Accepted Answer

A)   plants
B)   animals
C)   prokaryotes
D)   plants and animals
E)   All living organisms contain biomembranes.F) A) and C)
G) B) and E)

Question 9

Placing celery sticks in fresh water will make them more turgid and harder. This is because

Accepted Answer

A)   the celery is hypotonic to fresh water.
B)   the celery is hypertonic to fresh water.
C)   the celery is isotonic to fresh water.
D)   water moves from the celery sticks into fresh water.
E)   None of the choices are correct.F) C) and E)
G) C) and D)

Question 10

Cellular membranes are

Accepted Answer

A)   fluid.
B)   solely composed of lipids.
C)   composed of a single layer of amphipathic molecules.
D)   selective to the transport of gases and small molecules only.
E)   characteristic of eukaryotes, but not prokaryotes.F) B) and D)
G) A) and B)

Question 11

Which of the following statements is TRUE of membrane phospholipids?

Accepted Answer

A)   The hydrophilic head groups face the interior portion of the membrane.
B)   The hydrophobic tail groups face the exterior portion of the membrane.
C)   They spontaneously flip-flop from one side of the membrane to the other.
D)   They freely move laterally within the membrane.
E)   They rarely flip-flop across or move laterally within the membrane.F) None of the above
G) B) and E)

Question 12

The statements about transport of Ca2+ from the cytosol (low Ca2+ concentration)  into the endoplasmic reticulum (high Ca2+ concentration)  are true EXCEPT which of the following?

Accepted Answer

A)   Calcium movement involves the use of a pump.
B)   Calcium movement involves active transport.
C)   Calcium movement occurs by facilitated diffusion using a transporter protein.
D)   Calcium movement requires energy.
E)   Calcium movement occurs through a transmembrane protein.F) C) and D)
G) A) and C)

Question 13

A scientist produces an artificial membrane from phospholipids and notices that oxygen, but not glucose readily moves through the membrane. What might account for the inability of glucose to move through the artificial membrane?

Accepted Answer

A)   The artificial membrane lacked a protein needed for glucose transport.
B)   The artificial membrane lacked the appropriate types of phospholipids for glucose transport.
C)   Oxygen readily passes through the membrane, so glucose should have as well.
D)   The membrane lacked an adequate amount of amphipathic molecules for glucose transport.
E)   Thermodynamics does not allow glucose to pass through membranes produced either artificially or from living organisms.F) All of the above
G) None of the above

Question 14

Animal cells are permeable to water and urea but NOT to sucrose. Initially, the inside of a cell contains 1 M sucrose and 1 M urea and the outside 1 M sucrose and 2 M urea. After the system reaches equilibrium, what changes are observed?

Accepted Answer

A)   The molarity of urea would be higher outside than inside the cell.
B)   The molarity of sucrose would be similar inside and outside the cell.
C)   Water would move out of the cell causing the cell to shrivel.
D)   The molarity of urea would be higher outside the cell and the molarity of sucrose would be similar inside and outside the cell.
E)   The molarity of sucrose would be similar inside and outside the cell and water would move out of the cell causing the cell to shrivel.F) A) and D)
G) B) and C)

Question 15

Phospholipids and ________ are the major components of cell membranes.

Accepted Answer

A)   glycolipids
B)   cholesterol
C)   glucose transporters
D)   glycocalyx
E)   proteinsF) A) and B)
G) D) and E)

Question 16

Which of the following statements is CORRECT about active transport?

Accepted Answer

A)   It requires energy.
B)   It is an active process in which molecules move from a region of lower concentration to one of higher concentration.
C)   It requires integral proteins.
D)   It is necessary to maintain solute gradients across a membrane.
E)   All of the choices are correct.F) C) and D)
G) A) and E)

Question 17

A macrophage (immune cell) consuming a bacteria is best described as phagocytosis.

Accepted Answer

A) True 
 B)False

Question 18

Glycosylated proteins and lipids within the plasma membrane are important for

Accepted Answer

A)   cell recognition.
B)   cell protection.
C)   cell energy storage.
D)   cell recognition and protection.
E)   cell protection and energy storage.F) C) and D)
G) A) and E)

Question 19

Membrane proteins are attached to or embedded in the phospholipid bilayer.

Accepted Answer

A) True 
 B)False

Question 20

Plant cell membranes contain cholesterol.

Accepted Answer

A) True 
 B)False

Exam 5: Membrane Structure, Synthesis, and Transport

Of the following molecules, which passes through a lipid bilayer most readily?

Correct AnswerverifiedShow Answer

The Na+/K+-ATPase pump is a ligand-gated ion channel.

Correct AnswerverifiedFalse

Which of the following molecules would you predict moves through a lipid bilayer most rapidly?

Correct AnswerverifiedShow Answer

Animal cells are permeable to water and urea but NOT to sucrose. The inside of a cell contains 1 M sucrose and 1 M urea and the outside 1 M sucrose and 2 M urea. The solution inside with respect to outside the cell is

Correct AnswerverifiedA

Which of the following is NOT a function of cellular membranes?

Correct AnswerverifiedShow Answer

Which of the following is TRUE of phospholipids that flip-flop across the lipid bilayer?

Correct AnswerverifiedShow Answer

The current model that best describes biomembranes is the Rigid Mosaic Model.

Correct AnswerverifiedFalse

Which of the following organisms is likely to contain biomembranes?

Correct AnswerverifiedShow Answer

Placing celery sticks in fresh water will make them more turgid and harder. This is because

Correct AnswerverifiedShow Answer

Cellular membranes are

Correct AnswerverifiedShow Answer

Which of the following statements is TRUE of membrane phospholipids?

Correct AnswerverifiedShow Answer

The statements about transport of Ca2+ from the cytosol (low Ca2+ concentration) into the endoplasmic reticulum (high Ca2+ concentration) are true EXCEPT which of the following?

Correct AnswerverifiedShow Answer

A scientist produces an artificial membrane from phospholipids and notices that oxygen, but not glucose readily moves through the membrane. What might account for the inability of glucose to move through the artificial membrane?

Correct AnswerverifiedShow Answer

Animal cells are permeable to water and urea but NOT to sucrose. Initially, the inside of a cell contains 1 M sucrose and 1 M urea and the outside 1 M sucrose and 2 M urea. After the system reaches equilibrium, what changes are observed?

Correct AnswerverifiedShow Answer

Phospholipids and ________ are the major components of cell membranes.

Correct AnswerverifiedShow Answer

Which of the following statements is CORRECT about active transport?

Correct AnswerverifiedShow Answer

A macrophage (immune cell) consuming a bacteria is best described as phagocytosis.

Correct AnswerverifiedShow Answer

Glycosylated proteins and lipids within the plasma membrane are important for

Correct AnswerverifiedShow Answer

Membrane proteins are attached to or embedded in the phospholipid bilayer.

Correct AnswerverifiedShow Answer

Plant cell membranes contain cholesterol.

Correct AnswerverifiedShow Answer

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The Na⁺/K⁺-ATPase pump is a ligand-gated ion channel.

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False

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A

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The statements about transport of Ca²⁺ from the cytosol (low Ca²⁺ concentration) into the endoplasmic reticulum (high Ca²⁺ concentration) are true EXCEPT which of the following?

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