Question 1

A student sitting on the back row opened a bottle of foul-smelling perfume and dabbed it on her wrists.One-by-one (beginning from the back of the room) the students began to cough due to the foul smell.This phenomena was due to

Accepted Answer

A)   osmosis.
B)   molecules moving from an area of low concentration to high concentration.
C)   an allergic reaction.
D)   diffusion.
E)   active transport.F) C) and D)
G) B) and D)

Question 2

When you add sugar to your coffee or tea,the sugar is the

Accepted Answer

A)   permeable.
B)   solvent.
C)   gradient.
D)   solution.
E)   solute.F) C) and D)
G) B) and C)

Question 3

According to the fluid-mosaic model of membrane structure,

Accepted Answer

A)   proteins make up the bulk of the membrane.
B)   only lipids are found in the membrane.
C)   cholesterol is the main constituent of the membrane.
D)   glycolipids form a mosaic pattern inside the cell.
E)   proteins float inside or within the phospholipid bilayer.F) A) and B)
G) B) and D)

Question 4

In the new procedures developed to clone a mammalian cell,the nucleus is removed from an egg cell and the nucleus from the adult to be cloned is injected inside this cell.If we did this process with a basketball,we would permanently damage the shell.What property of the cell repairs this damage?

Accepted Answer

A)   diffusion of cell membrane proteins
B)   carrier proteins restore the membrane lipids
C)   isotonic solutions
D)   the outer and inner sides of the plasma membrane have identical carbohydrate chains
E)   the fluid-mosaic nature of the membraneF) A) and D)
G) C) and E)

Question 5

Molecules such as glucose and amino acids are NOT lipid soluble and therefore they

Accepted Answer

A)   easily pass across the cell membrane.
B)   require active transport to cross the cell membrane.
C)   must be converted to lipids before they can enter a cell.
D)   combine with carrier proteins and pass across by facilitated transport.
E)   must be engulfed by a cell using endocytosis.F) A) and E)
G) All of the above

Question 6

Once a solute and a solvent are evenly distributed in a solution,they will

Accepted Answer

A)   stop moving about.
B)   move back toward a concentration of the solvent.
C)   continue to move about but with no net movement to higher concentration.
D)   be totally out of equilibrium.
E)   move from a liquid to gaseous solution.F) A) and E)
G) D) and E)

Question 7

Which is true of facilitated transport by carrier proteins?

Accepted Answer

A)   Facilitated transport only applies to small and lipid soluble molecules.
B)   It is represented by the glucose carrier that can transport hundreds of molecules a second.
C)   After a carrier has transported a molecule, it is unable to transport any more.
D)   Facilitated transport requires expenditure of chemical energy and is therefore active transport.
E)   One carrier protein can carry a variety of different molecules.F) A) and D)
G) B) and C)

Question 8

Exocytosis and endocytosis are carried out by proteins in the cell membrane.

Accepted Answer

A) True 
 B)False

Question 9

Of the following conditions,which is absolutely necessary for diffusion to take place?

Accepted Answer

A)   a differentially permeable membrane
B)   a true solution
C)   a concentration difference
D)   a non-permeable membrane
E)   a living cellF) A) and D)
G) All of the above

Question 10

Macrophages,a type of white blood cells,are able to remove bacteria from our bloodstream and tissues by

Accepted Answer

A)   passive transport.
B)   facilitated diffusion.
C)   osmosis.
D)   pinocytosis.
E)   phagocytosis.F) B) and D)
G) B) and C)

Question 11

If a molecule crosses a plasma membrane faster than it diffuses in water,then the process is likely to involve active transport.

Accepted Answer

A) True 
 B)False

Question 12

The cell membrane is composed of

Accepted Answer

A)   proteins and microtubules.
B)   lipids and actin filaments.
C)   lipids and microtubules.
D)   lipids and proteins.
E)   proteins and actin filaments.F) C) and E)
G) D) and E)

Question 13

List the three types of intercelluar junctions found in animal cells and indicate their function.

Accepted Answer

Adhesion junctions: form a sturdy but fl...

Question 14

When water enters a plant cell

Accepted Answer

A)   it bursts.
B)   the vacuole becomes enlarged.
C)   the vacuole shrinks.
D)   it undergoes plasmolysis.
E)   it undergoes crenation.F) A) and E)
G) C) and D)

Question 15

How can marine animals such as sharks live in a salt water?

Accepted Answer

A)   They increase or decrease the amount of urea in their blood until the blood is isotonic with the environment.
B)   They increase the amount of urea in their blood until the blood is hypertonic with the environment.
C)   They decrease the amount of urea in their blood until the blood is hypotonic with the environment.
D)   They contain impermeable membranes which do not allow the salt water to cross into their cells.
E)   They contain blood that has the same salt concentration as is present in salt water.F) A) and B)
G) D) and E)

Question 16

Which of the following is not a function of the cell membrane?

Accepted Answer

A)   It provides mechanical strength to the cell.
B)   It gives shape to the cell.
C)   It regulates passage of molecules into and out of the cell.
D)   It is largely responsible for cellular homeostasis.
E)   Serves as a site for protein synthesis.F) C) and E)
G) D) and E)

Question 17

In certain cancerous cells,the cell divides continuously even in the absence of a growth factor (signaling molecule) that indicates the cell should divide.Which of the following could NOT explain this?

Accepted Answer

A)   a receptor molecule that is always turned off
B)   a receptor molecule that is always activated
C)   a transduction pathway that is always turned on
D)   a target protein that is always activated
E)   a gene for cell division that is expressed when it should not beF) C) and D)
G) A) and D)

Question 18

Which of the following refers to materials only leaving the cell?

Accepted Answer

A)   diffusion
B)   exocytosis
C)   endocytosis
D)   pinocytosis
E)   phagocytosisF) B) and C)
G) B) and D)

Question 19

Permeability refers to

Accepted Answer

A)   the movement of molecules from an area of greater concentration to an area of lesser concentration.
B)   the extent to which a membrane allows a substance to pass through.
C)   the amount of solute in a solution.
D)   the state of being permanent.
E)   the ability to establish a permanent solute level in a solution.F) D) and E)
G) B) and C)

Question 20

The term hypertonic means

Accepted Answer

A)   to lose water.
B)   to gain water.
C)   a higher solute concentration.
D)   a lower solute concentration.
E)   an equal solute concentration.F) None of the above
G) A) and B)

Exam 4: Membrane Structure and Function

When you add sugar to your coffee or tea,the sugar is the

Correct AnswerverifiedShow Answer

Permeability refers to

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The cell membrane is composed of

Correct AnswerverifiedShow Answer

Of the following conditions,which is absolutely necessary for diffusion to take place?

Correct AnswerverifiedShow Answer

When water enters a plant cell

Correct AnswerverifiedShow Answer

If a molecule crosses a plasma membrane faster than it diffuses in water,then the process is likely to involve active transport.

Correct AnswerverifiedShow Answer

In the new procedures developed to clone a mammalian cell,the nucleus is removed from an egg cell and the nucleus from the adult to be cloned is injected inside this cell.If we did this process with a basketball,we would permanently damage the shell.What property of the cell repairs this damage?

Correct AnswerverifiedShow Answer

Exocytosis and endocytosis are carried out by proteins in the cell membrane.

Correct AnswerverifiedShow Answer

According to the fluid-mosaic model of membrane structure,

Correct AnswerverifiedShow Answer

Molecules such as glucose and amino acids are NOT lipid soluble and therefore they

Correct AnswerverifiedShow Answer

How can marine animals such as sharks live in a salt water?

Correct AnswerverifiedShow Answer

Macrophages,a type of white blood cells,are able to remove bacteria from our bloodstream and tissues by

Correct AnswerverifiedShow Answer

The term hypertonic means

Correct AnswerverifiedShow Answer

Which of the following refers to materials only leaving the cell?

Correct AnswerverifiedShow Answer

Which of the following is not a function of the cell membrane?

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Once a solute and a solvent are evenly distributed in a solution,they will

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List the three types of intercelluar junctions found in animal cells and indicate their function.

Correct AnswerverifiedAdhesion junctions: form a sturdy but fl...View AnswerShow Answer

A student sitting on the back row opened a bottle of foul-smelling perfume and dabbed it on her wrists.One-by-one (beginning from the back of the room) the students began to cough due to the foul smell.This phenomena was due to

Correct AnswerverifiedShow Answer

In certain cancerous cells,the cell divides continuously even in the absence of a growth factor (signaling molecule) that indicates the cell should divide.Which of the following could NOT explain this?

Correct AnswerverifiedShow Answer

Which is true of facilitated transport by carrier proteins?

Correct AnswerverifiedShow Answer

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Adhesion junctions: form a sturdy but fl...
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