Question 1

Molecules that permeate a plasma membrane by facilitated diffusion:

Accepted Answer

A)  require an expenditure of energy.
B)  require the aid of transport proteins.
C)  move from an area of low concentration to an area of high concentration.
D)  do so much more quickly than those crossing by simple diffusion. B

Question 2

What is active transport?

Accepted Answer

A)  diffusion of molecules within a cell
B)  movement of molecules into or out of a cell against a concentration gradient
C)  movement of molecules into or out of a cell down a concentration gradient
D)  movement of molecules into or out of a cell using special proteins and not requiring an expenditure of energy
E)  rapid movement of molecules in a solution

Question 3

If a frog egg cell is placed into a hypotonic solution, it will:

Accepted Answer

A)  shrivel via osmosis.
B)  swell via osmosis.
C)  shrivel via facilitated diffusion.
D)  swell via facilitated diffusion.
E)  shrivel via active transport.

Question 4

Communication between cells occurs via ________ in plant cells and via ________ in animal cells.

Accepted Answer

plasmodesm...

Question 5

Based on these four illustrations of diffusion, which mode would most likely be used to transport oxidized zinc (which has a charge of +2) through the cell membrane?

Accepted Answer

A)  simple diffusion through the bilayer
B)  facilitated diffusion through channel proteins
C)  facilitated diffusion through carrier proteins
D)  osmosis through aquaporins

Question 6

Recognition proteins are most important for:

Accepted Answer

A)  facilitated diffusion of molecules.
B)  active transport of molecules.
C)  maintaining membrane integrity.
D)  maintaining membrane fluidity.
E)  distinguishing foreign cells from "self" cells.

Question 7

Which of the following would not be found in a membrane?

Accepted Answer

A)  cellulose
B)  cholesterol
C)  phospholipid
D)  channel protein
E)  receptor protein

Question 8

Plasma membranes are BEST described as a:

Accepted Answer

A)  double layer of phospholipids with hydrophobic tails directed toward the cytoplasm of the cell.
B)  single layer of phospholipids with water molecules attached along one side.
C)  double layer of phospholipids with hydrophilic heads directed toward one another.
D)  double layer of phospholipids with hydrophobic tails oriented toward one another.
E)  single layer of phospholipids with tails pointed toward the inside of the cell.

Question 9

In reference to diffusion, "passive" really means:

Accepted Answer

A)  without a membrane.
B)  in the air.
C)  no gradient.
D)  very slowly.
E)  no energy required.

Question 10

The cells of the intestinal epithelium (lining)are joined to one another by ________ that prevent substances from passing between the cells of this tissue.

Accepted Answer

The answer of The cells of the intestinal epithelium (lining)are...

Question 11

If you forget to water your favorite plant, all of the following will occur at a cellular level EXCEPT:

Accepted Answer

A)  water will move out of the cytosol by osmosis.
B)  water will move out of the vacuole by osmosis.
C)  turgor pressure will build up in the cell.
D)  the plasma membrane will shrink away from the cell wall.
E)  osmosis will occur. C

Question 12

The bacterium Vibrio cholerae releases a toxin that blocks a channel protein in the membranes of cells that line the intestine. This toxin prevents the movement of positively charged sodium ions out of the intestine and into these cells. If the sodium ions could not move into the cells, how would this affect the movement of water?

Accepted Answer

A)  Water would leave the intestines and enter the cells by diffusion.
B)  Water would leave the intestines and enter the cells by osmosis.
C)  Water would leave the cells and enter the intestines by diffusion.
D)  Water would leave the cells and enter the intestines by osmosis.
E)  The movement of water would not be affected.

Question 13

Which process accounts for the movement of solids into some animal cells?

Accepted Answer

A)  active transport
B)  facilitated diffusion
C)  simple diffusion
D)  osmosis
E)  phagocytosis

Question 14

The antibiotic polymyxin B attaches itself to the phospholipids in the phospholipid bilayer and increases the permeability of the membrane. Describe what will occur as a result.

Accepted Answer

The plasma membrane will lose its abilit...

Question 15

A freshwater protozoan, such as Paramecium, tends to ________ because it lives in a ________ environment.

Accepted Answer

A)  gain water; hypotonic
B)  lose water; hypertonic
C)  gain water; hypertonic
D)  lose water; hypotonic
E)  gain water; isotonic A

Question 16

Osmosis is the diffusion of water molecules across selectively water-permeable membranes. True or False?

Accepted Answer

A) True 
 B)False

Question 17

ISO membranes are inside-out membrane vesicles used by researchers in membrane studies. As a molecule diffuses into the vesicle, it will encounter the layers of the membrane in the following order:

Accepted Answer

A)  head-tail-head-tail.
B)  tail-head-head-tail.
C)  head-tail-tail-head.
D)  tail-head-tail-head.
E)  head-head-tail-tail.

Question 18

If the radius of one cell were twice as large as the radius of another cell, how much higher or lower would its surface area-to-volume ratio be?

Accepted Answer

A)  two times higher
B)  two times lower
C)  half (lower) 
D)  ten times higher

Question 19

In general, which of the following is largely responsible for moving substances across the plasma membrane, communicating with other cells, and identifying the cell?

Accepted Answer

A)  phospholipids
B)  carbohydrates
C)  proteins
D)  nucleic acids
E)  cytoskeleton

Question 20

What structure in the membrane causes plasma membranes to resist freezing?

Accepted Answer

A)  polar heads of the phospholipids
B)  channel proteins
C)  cholesterol
D)  saturated fatty acid tails
E)  unsaturated fatty acid tails

Exam 5: Cell Membrane Structure and Function

Molecules that permeate a plasma membrane by facilitated diffusion:

Correct Answer
verified
B

What is active transport?

Correct Answer
verified

If a frog egg cell is placed into a hypotonic solution, it will:

Correct Answer
verified

Communication between cells occurs via in plant cells and via in animal cells.

Correct Answer
verified
plasmodesm...
View Answer

Based on these four illustrations of diffusion, which mode would most likely be used to transport oxidized zinc (which has a charge of +2) through the cell membrane?

Correct Answer
verified

Recognition proteins are most important for:

Correct Answer
verified

Which of the following would not be found in a membrane?

Correct Answer
verified

Plasma membranes are BEST described as a:

Correct Answer
verified

In reference to diffusion, "passive" really means:

Correct Answer
verified

The cells of the intestinal epithelium (lining)are joined to one another by ________ that prevent substances from passing between the cells of this tissue.

Correct Answer
verified

If you forget to water your favorite plant, all of the following will occur at a cellular level EXCEPT:

Correct Answer
verified
C

Correct Answer
verified

Which process accounts for the movement of solids into some animal cells?

Correct Answer
verified

The antibiotic polymyxin B attaches itself to the phospholipids in the phospholipid bilayer and increases the permeability of the membrane. Describe what will occur as a result.

Correct Answer
verified
The plasma membrane will lose its abilit...
View Answer

A freshwater protozoan, such as Paramecium, tends to because it lives in a environment.

Correct Answer
verified
A

Osmosis is the diffusion of water molecules across selectively water-permeable membranes. True or False?

Correct Answer
verified

ISO membranes are inside-out membrane vesicles used by researchers in membrane studies. As a molecule diffuses into the vesicle, it will encounter the layers of the membrane in the following order:

Correct Answer
verified

If the radius of one cell were twice as large as the radius of another cell, how much higher or lower would its surface area-to-volume ratio be?

Correct Answer
verified

In general, which of the following is largely responsible for moving substances across the plasma membrane, communicating with other cells, and identifying the cell?

Correct Answer
verified

What structure in the membrane causes plasma membranes to resist freezing?

Correct Answer
verified

Exam 5: Cell Membrane Structure and Function

Molecules that permeate a plasma membrane by facilitated diffusion:

Correct AnswerverifiedB

What is active transport?

Correct AnswerverifiedShow Answer

If a frog egg cell is placed into a hypotonic solution, it will:

Correct AnswerverifiedShow Answer

Communication between cells occurs via ________ in plant cells and via ________ in animal cells.

Correct Answerverifiedplasmodesm...View AnswerShow Answer

Based on these four illustrations of diffusion, which mode would most likely be used to transport oxidized zinc (which has a charge of +2) through the cell membrane?

Correct AnswerverifiedShow Answer

Recognition proteins are most important for:

Correct AnswerverifiedShow Answer

Which of the following would not be found in a membrane?

Correct AnswerverifiedShow Answer

Plasma membranes are BEST described as a:

Correct AnswerverifiedShow Answer

In reference to diffusion, "passive" really means:

Correct AnswerverifiedShow Answer

The cells of the intestinal epithelium (lining)are joined to one another by ________ that prevent substances from passing between the cells of this tissue.

Correct AnswerverifiedShow Answer

If you forget to water your favorite plant, all of the following will occur at a cellular level EXCEPT:

Correct AnswerverifiedC

Correct AnswerverifiedShow Answer

Which process accounts for the movement of solids into some animal cells?

Correct AnswerverifiedShow Answer

The antibiotic polymyxin B attaches itself to the phospholipids in the phospholipid bilayer and increases the permeability of the membrane. Describe what will occur as a result.

Correct AnswerverifiedThe plasma membrane will lose its abilit...View AnswerShow Answer

A freshwater protozoan, such as Paramecium, tends to ________ because it lives in a ________ environment.

Correct AnswerverifiedA

Osmosis is the diffusion of water molecules across selectively water-permeable membranes. True or False?

Correct AnswerverifiedShow Answer

ISO membranes are inside-out membrane vesicles used by researchers in membrane studies. As a molecule diffuses into the vesicle, it will encounter the layers of the membrane in the following order:

Correct AnswerverifiedShow Answer

If the radius of one cell were twice as large as the radius of another cell, how much higher or lower would its surface area-to-volume ratio be?

Correct AnswerverifiedShow Answer

In general, which of the following is largely responsible for moving substances across the plasma membrane, communicating with other cells, and identifying the cell?

Correct AnswerverifiedShow Answer

What structure in the membrane causes plasma membranes to resist freezing?

Correct AnswerverifiedShow Answer

Correct Answer
verified
B

Correct Answer
verified

Correct Answer
verified

Communication between cells occurs via in plant cells and via in animal cells.

Correct Answer
verified
plasmodesm...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
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Correct Answer
verified

Correct Answer
verified
The plasma membrane will lose its abilit...
View Answer

A freshwater protozoan, such as Paramecium, tends to because it lives in a environment.

Correct Answer
verified
A

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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