Question 1

Which of the following functions best explains the reason for the asymmetrically oriented structure of the proteins in the cell membrane?

Accepted Answer

A)   These proteins are manufactured by free ribosomes.
B)   Each type of protein has its own function.
C)   These proteins pass through the ER membrane into the ER lumen.
D)   Enzymes are needed to modify the carbohydrate chains on these proteins.
E)   These proteins are initially formed by ribosomes on the rough ER.

Question 2

The higher the concentration of solute in a solution, the __________ the effective water concentration and the __________ the osmotic pressure.

Accepted Answer

A)   lower; lower
B)   lower; higher
C)   higher; higher
D)   higher; lower
E)   Answer cannot be determined from the information provided.

Question 3

MATCHING
a.Transmit information into cell
d.Use ATP to transport solutes
b.Catalyze reactions which take place within or along membrane surface
e.Anchor cell to extracellular matrix
c.Allow selective transport of ions or molecules
-channels

Accepted Answer

The answer of MATCHING
a.Transmit information into cell
d.Use ATP to transport...

Question 4

Biological membranes are one dimensional fluids.
__________________

Accepted Answer

A) True 
 B)False

Question 5

Proteins that are destined to become associated with the inner surface of the plasma membrane are:

Accepted Answer

A)   manufactured in the same way as protein hormones.
B)   manufactured in the same way as proteins destined to become external peripheral proteins.
C)   made on free ribosomes in the cytoplasm.
D)   made on ribosomes located on the rough endoplasmic reticulum.
E)   transported to the plasma membrane within a secretory vesicle.

Question 6

Solutions that are isotonic:

Accepted Answer

A)   are not in dynamic equilibrium.
B)   have equal concentrations of solute and water.
C)   have equal concentrations of solute but not water.
D)   have equal concentrations of water but not solute.
E)   will exhibit a net movement of water from one solution to the other.

Question 7

Integral proteins:

Accepted Answer

A)   are weakly bound to the surface of the membrane.
B)   are strongly bound to the cytosolic surface of the membrane.
C)   have no hydrophobic portions.
D)   are completely embedded within the lipid bilayer.
E)   are amphipathic.

Question 8

An ABC transporter:

Accepted Answer

A)   is a type of water channel.
B)   uses the energy of ATP to transport solutes.
C)   uses gated channels to transport ADP.
D)   is present in kidney tubules and prevents dehydration.
E)   is a type of porin.

Question 9

The structures in this figure:

Accepted Answer

A)   provide anchorage points between adjacent cells.
B)   allow the transport of small molecules and ions between adjacent cells.
C)   allow passage of materials through intercellular spaces.
D)   prevent the passage of materials through intercellular spaces.
E)   can only be found in plants.

Question 10

Figure 5-1
Use the figure to answer the corresponding question(s) . 
-Refer to Figure 5-1.Which of the following statements about the red blood cells in Figure B is true?

Accepted Answer

A)   These red blood cells have been placed in an isotonic solution.
B)   These red blood cells have swollen in response to a hypertonic external solution.
C)   These red blood cells have swollen in response to a hypotonic external solution.
D)   These red blood cells have shrunken in response to a hypertonic external solution.
E)   These red blood cells have shrunken in response to a hypotonic external solution.

Question 11

What is meant by the term "fluid mosaic model"?

Accepted Answer

A)   It is the diffusion of lipid-soluble substances through the lipid bilayer.
B)   It is the movement of lipids and integral proteins within the lipid bilayer.
C)   It is the solubility of water in the membrane.
D)   It is the method of substance transport across the membrane.
E)   It is the movement of surface proteins through the membrane.

Question 12

Facilitated diffusion:

Accepted Answer

A)   requires a transmembrane protein.
B)   requires ATP.
C)   can move molecules against a concentration gradient.
D)   is typically used to transport small nonpolar molecules.
E)   is typically used to transport large food particles.

Question 13

Biological membranes are normally permeable to:

Accepted Answer

A)   large, hydrophilic molecules.
B)   small, hydrophilic molecules.
C)   large, hydrophobic molecules.
D)   small, hydrophobic molecules.
E)   ABC transporters

Question 14

A person has a genetic disease that prevents the phospholipids in the plasma membrane of the white blood cells from freely fusing with the other membranes within the cell.How would this disease affect phagocytosis?

Accepted Answer

A)   Lysosomes would not be formed.
B)   Facilitated diffusion would not occur.
C)   Lysosomes would be formed lacking hydrolytic enzymes.
D)   The phagocytic vacuole would not fuse with the lysosome.
E)   Endocytosis would not occur.

Question 15

If solution of A is hypotonic to B, then the direction of net movement of water is B to A .
__________________

Accepted Answer

A) True 
 B)False

Question 16

Cholesterol within membranes functions as a(n)  __________ through its interactions with both hydrophobic and hydrophilic parts of phospholipids.

Accepted Answer

A)   water blocker
B)   pH buffer
C)   energy source
D)   temperature controller
E)   fluidity buffer

Question 17

Studies of glucose transport in liposomes have revealed that:

Accepted Answer

A)   glucose is transported against a concentration gradient.
B)   the binding of glucose triggers a conformational change in the carrier protein.
C)   the transport of solutes via carrier proteins is faster than via channel proteins.
D)   glucose phosphates move readily across the membrane by simple diffusion.
E)   glucose moves readily across the membrane by simple diffusion.

Question 18

Compare and contrast the mechanisms of the sodium-potassium pump and glucose-sodium cotransport systems.

Accepted Answer

Concepts to Consider: Role of ...

Question 19

In cells that are constantly involved in secretion, an equivalent amount of membrane must be returned to the interior of the cell for each vesicle that fuses with the plasma membrane; if this does not occur, then what would happen?

Accepted Answer

A)   The ratio of cell surface would decrease, compared to cell volume.
B)   The cell surface would shrivel.
C)   The surface area would remain constant.
D)   The number of membrane receptor proteins would decrease.
E)   The cell surface will keep expanding.

Question 20

Which of the following molecules is least likely to cross a cellular membrane by simple diffusion?

Accepted Answer

A)   carbon dioxide
B)   nitrogen
C)   oxygen
D)   potassium ion
E)   water

Exam 5: Biological Membranes

The higher the concentration of solute in a solution, the __________ the effective water concentration and the __________ the osmotic pressure.

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Biological membranes are one dimensional fluids. __________________

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Figure 5-1 Use the figure to answer the corresponding question(s) . -Refer to Figure 5-1.Which of the following statements about the red blood cells in Figure B is true?

Correct AnswerverifiedShow Answer

Integral proteins:

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Studies of glucose transport in liposomes have revealed that:

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Proteins that are destined to become associated with the inner surface of the plasma membrane are:

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Which of the following functions best explains the reason for the asymmetrically oriented structure of the proteins in the cell membrane?

Correct AnswerverifiedShow Answer

Facilitated diffusion:

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Cholesterol within membranes functions as a(n) __________ through its interactions with both hydrophobic and hydrophilic parts of phospholipids.

Correct AnswerverifiedShow Answer

Biological membranes are normally permeable to:

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If solution of A is hypotonic to B, then the direction of net movement of water is B to A . __________________

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MATCHING a.Transmit information into cell d.Use ATP to transport solutes b.Catalyze reactions which take place within or along membrane surface e.Anchor cell to extracellular matrix c.Allow selective transport of ions or molecules -channels

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What is meant by the term "fluid mosaic model"?

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In cells that are constantly involved in secretion, an equivalent amount of membrane must be returned to the interior of the cell for each vesicle that fuses with the plasma membrane; if this does not occur, then what would happen?

Correct AnswerverifiedShow Answer

Solutions that are isotonic:

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The structures in this figure:

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Compare and contrast the mechanisms of the sodium-potassium pump and glucose-sodium cotransport systems.

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An ABC transporter:

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A person has a genetic disease that prevents the phospholipids in the plasma membrane of the white blood cells from freely fusing with the other membranes within the cell.How would this disease affect phagocytosis?

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Which of the following molecules is least likely to cross a cellular membrane by simple diffusion?

Correct AnswerverifiedShow Answer

The higher the concentration of solute in a solution, the the effective water concentration and the the osmotic pressure.

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Concepts to Consider: Role of ...
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