Question 1

How are integral proteins unique in cell membranes?

Accepted Answer

A)   They have no hydrophobic portions.
B)   They are weakly bound to the surface of the membrane.
C)   They are only located on the inner side of a membrane.
D)   They are firmly bound to the membrane and can only be released with a detergent.
E)   They are completely embedded within the lipid bilayer with no exposure to the internal cell environment.

Question 2

What facilitate the rapid transport of water through the plasma membrane?

Accepted Answer

A)   osmosis
B)   uniporters
C)   aquaporins
D)   channel proteins
E)   ABC transporters

Question 3

Osmotic pressure of a solution is the amount of pressure exerted on the side of the selectively permeable containing a higher concentration of solute to prevent diffusion of solute . __________________

Accepted Answer

A) True 
 B)False

Question 4

In the experiment in which Frye and Edidin fused the plasma membranes of a mouse and a human cell, what happened to the membrane proteins?

Accepted Answer

A)   They formed a bilayer.
B)   They formed a spherical structure.
C)   They moved laterally across the cell surface.
D)   They flip-flopped from one layer to the other.
E)   They reacted with cholesterol molecules on the membrane surface.

Question 5

Match between columns
                        Premises: membranebound enzymes
signal transduction receptors
channels
protein pumps
integrins

Accepted Answer

The Answer of Catalyze reactions which take place within or is...

Question 6

____ are loosely associated with the phospholipid bilayer, whereas ____ are tightly bound to it.

Accepted Answer

A)   Peripheral proteins; integral proteins
B)   Integral proteins; peripheral proteins
C)   Glycoproteins; peripheral proteins
D)   Integral proteins; glycoproteins
E)   Glycolipids; glycoproteins

Question 7

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 8

What method does a human white blood cell employ to engulf a bacterial cell?

Accepted Answer

A)   osmosis
B)   exocytosis
C)   pinocytosis
D)   phagocytosis
E)   facilitated diffusion

Question 9

Sodium-potassium pumps maintain a(n) electrochemical gradient. 
__________________

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

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

Question 11

In a lipid bilayer, __________ fatty acid tails face each other within the bilayer and form a region that excludes water.

Accepted Answer

A)   hypertonic
B)   hyperosmotic
C)   hypotonic
D)   hydrophilic
E)   hydrophobic

Question 12

Figure 5-1  Refer to the accompanying figure. Which best describes what is happening to the red blood cells in Figure A?

Accepted Answer

A)   Pinocytosis has occurred.
B)   Plasmolysis has occurred.
C)   There has been no net water movement.
D)   There has been a net flow of water out of the cell.
E)   There has been a net flow of water into the cell.

Question 13

Figure 5-3  In the accompanying figure, what is the role of the structures between the membranes?

Accepted Answer

A)   They provide structure to plant cells.
B)   They provide anchorage points between adjacent cells.
C)   They allow passage of materials through intercellular spaces.
D)   They prevent the passage of materials through intercellular spaces.
E)   They allow the transport of small molecules and ions between adjacent cells.

Question 14

Which of the following statements about phospholipids is false ?

Accepted Answer

A)   They are amphipathic molecules.
B)   They contain three fatty acids chains.
C)   They contain a polar organic group attached to a phosphate group.
D)   They have cylindrical shapes that allow them to associate with water most easily as a bilayer structure.
E)   They have two distinct regions, one strongly hydrophobic and the other strongly hydrophilic.

Question 15

Plasmodesmata of plant cells are functionally equivalent to the ____ of animal cells.

Accepted Answer

A)   vesicles
B)   gap junctions
C)   tight junctions
D)   anchoring junctions
E)   cell surface receptors

Question 16

If phospholipids form a spherical structure when placed in water, then which of the following is the most logical conclusion about those phospholipid molecules?

Accepted Answer

A)   They form a bilayer.
B)   They are cone-shaped.
C)   They are not amphipathic.
D)   They have two hydrophilic ends.
E)   They contain two fatty acid chains.

Question 17

Which explanation best describes the asymmetrically oriented structure of the proteins in the cell membrane?

Accepted Answer

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

Question 18

Using correct terminology, describe what would happen to a red blood cell placed in a solution of 0.5% sodium chloride.

Accepted Answer

A red blood cell placed in a s...

Question 19

The term "fluid mosaic model" refers to the:

Accepted Answer

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

Question 20

A transmembrane protein differs from other membrane proteins because it:

Accepted Answer

A)   completely extends through the membrane.
B)   is a glycoprotein with carbohydrates attached.
C)   is completely embedded within the membrane.
D)   is attached to the inside of the membrane by an ionic bond.
E)   is covalently linked to the outer surface of the plasma membrane.

Exam 5: Biological Membranes

Figure 5-1 Refer to the accompanying figure. Which best describes what is happening to the red blood cells in Figure A?

Correct Answer
verified

What facilitate the rapid transport of water through the plasma membrane?

Correct Answer
verified

Matching

Using correct terminology, describe what would happen to a red blood cell placed in a solution of 0.5% sodium chloride.

Correct Answer
verified
A red blood cell placed in a s...
View Answer

are loosely associated with the phospholipid bilayer, whereas are tightly bound to it.

Correct Answer
verified

In the experiment in which Frye and Edidin fused the plasma membranes of a mouse and a human cell, what happened to the membrane proteins?

Correct Answer
verified

How are integral proteins unique in cell membranes?

Correct Answer
verified

Plasmodesmata of plant cells are functionally equivalent to the ____ of animal cells.

Correct Answer
verified

What method does a human white blood cell employ to engulf a bacterial cell?

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

The term "fluid mosaic model" refers to the:

Correct Answer
verified

Which of the following statements about phospholipids is false ?

Correct Answer
verified

Osmotic pressure of a solution is the amount of pressure exerted on the side of the selectively permeable containing a higher concentration of solute to prevent diffusion of solute . __________________

Correct Answer
verified

Figure 5-3 In the accompanying figure, what is the role of the structures between the membranes?

Correct Answer
verified

Which explanation best describes the asymmetrically oriented structure of the proteins in the cell membrane?

Correct Answer
verified

A transmembrane protein differs from other membrane proteins because it:

Correct Answer
verified

Sodium-potassium pumps maintain a(n) electrochemical gradient. __________________

Correct Answer
verified

If phospholipids form a spherical structure when placed in water, then which of the following is the most logical conclusion about those phospholipid molecules?

Correct Answer
verified

In a lipid bilayer, __________ fatty acid tails face each other within the bilayer and form a region that excludes water.

Correct Answer
verified

Exam 5: Biological Membranes

Figure 5-1 Refer to the accompanying figure. Which best describes what is happening to the red blood cells in Figure A?

Correct AnswerverifiedShow Answer

What facilitate the rapid transport of water through the plasma membrane?

Correct AnswerverifiedShow Answer

Matching

Using correct terminology, describe what would happen to a red blood cell placed in a solution of 0.5% sodium chloride.

Correct AnswerverifiedA red blood cell placed in a s...View AnswerShow Answer

____ are loosely associated with the phospholipid bilayer, whereas ____ are tightly bound to it.

Correct AnswerverifiedShow Answer

In the experiment in which Frye and Edidin fused the plasma membranes of a mouse and a human cell, what happened to the membrane proteins?

Correct AnswerverifiedShow Answer

How are integral proteins unique in cell membranes?

Correct AnswerverifiedShow Answer

Plasmodesmata of plant cells are functionally equivalent to the ____ of animal cells.

Correct AnswerverifiedShow Answer

What method does a human white blood cell employ to engulf a bacterial cell?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The term "fluid mosaic model" refers to the:

Correct AnswerverifiedShow Answer

Which of the following statements about phospholipids is false ?

Correct AnswerverifiedShow Answer

Osmotic pressure of a solution is the amount of pressure exerted on the side of the selectively permeable containing a higher concentration of solute to prevent diffusion of solute . __________________

Correct AnswerverifiedShow Answer

Figure 5-3 In the accompanying figure, what is the role of the structures between the membranes?

Correct AnswerverifiedShow Answer

Which explanation best describes the asymmetrically oriented structure of the proteins in the cell membrane?

Correct AnswerverifiedShow Answer

A transmembrane protein differs from other membrane proteins because it:

Correct AnswerverifiedShow Answer

Sodium-potassium pumps maintain a(n) electrochemical gradient. __________________

Correct AnswerverifiedShow Answer

If phospholipids form a spherical structure when placed in water, then which of the following is the most logical conclusion about those phospholipid molecules?

Correct AnswerverifiedShow Answer

In a lipid bilayer, __________ fatty acid tails face each other within the bilayer and form a region that excludes water.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
verified
A red blood cell placed in a s...
View Answer

are loosely associated with the phospholipid bilayer, whereas are tightly bound to it.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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