Question 1

Certain individuals with a Y chromosome develop into females because testosterone is not able to induce the formation of male sexual characteristics.This is most likely due to a defect in

Accepted Answer

A)  the signaling molecule.
B)  the receptor.
C)  the transduction pathway.
D)  the target protein.
E)  the Y chromosome.F) None of the above
G) A) and E)

Question 2

Which intercellular junction allows for the rapid movement of small molecules or ions to flow from one animal cell to the next?

Accepted Answer

A)  gap junctions
B)  tight junctions
C)  adhesion junctions
D)  desmosomes
E)  plasmodesmataF) A) and E)
G) A) and D)

Question 3

The pressure that is generated when water flows through a differentially permeable membrane is termed

Accepted Answer

A)  osmotic pressure.
B)  turgor pressure.
C)  plasmolysis.
D)  crenation.
E)  tonicity.F) A) and B)
G) All of the above

Question 4

When an intestinal cell ingests substances inside very small vesicles that can only be seen with an electron microscope,this is

Accepted Answer

A)  pinocytosis.
B)  phagocytosis.
C)  exocytosis.
D)  active transport.
E)  diffusion.F) A) and B)
G) B) and D)

Question 5

What will happen to dye crystals if placed in the bottom of a beaker of water over a long period of time?

Accepted Answer

A)  They will undergo osmosis to a different location.
B)  They will undergo active transport to a different location.
C)  They will all diffuse to the top of the beaker.
D)  They will diffuse equally throughout the beaker.
E)  They will stay at the bottom of the beaker.F) C) and D)
G) C) and E)

Question 6

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) None of the above
G) A) and B)

Question 7

Which of the following statements is true regarding the inside and outside of the plasma membrane?

Accepted Answer

A)  Both the inside and outside layers make up the phospholipid bilayer and both layers contain identical proteins.
B)  Both the inside and outside layers make up the phospholipid bilayer but cytoskeletal filaments are present on the outside layer and carbohydrate chains of glycolipids and proteins are present on the inside layer.
C)  Both the inside and outside layers make up the phospholipid bilayer but cytoskeletal filaments are present on the inside layer and carbohydrate chains of glycolipids and proteins are present on the outside layer.
D)  The inside layer consists of a phospholipid bilayer while the outside layer consists of carbohydrate chains of glycolipids and proteins.
E)  The outside layer consists of a phospholipid bilayer while the inside layer consists of carbohydrate chains of glycolipids and proteins.F) All of the above
G) A) and B)

Question 8

If 0.9% NaCl were isotonic to a cell,then

Accepted Answer

A)  0.9% would also be hypotonic.
B)  0.9% would also be hypertonic.
C)  1.0% would be hypertonic.
D)  1.0% would be hypotonic.
E)  0.1% would be hypertonic.F) B) and E)
G) None of the above

Question 9

The plasma 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) A) and D)
G) B) and D)

Question 10

One way to determine whether something is being actively transported across a membrane is to compare its rate of transport with and without a chemical that blocks ATP production.

Accepted Answer

A) True 
 B)False

Question 11

The number of mitochondria in a cell would be a general indicator of the extent of

Accepted Answer

A)  diffusion.
B)  facilitated transport.
C)  active transport.
D)  osmosis.
E)  both osmosis and diffusion.F) B) and E)
G) A) and C)

Question 12

Which component of the extracellualr matrix is responsible for forming proteoglycans?

Accepted Answer

A)  amino sugars
B)  fibronectin
C)  collagen
D)  elastin
E)  integrinF) A) and D)
G) C) and D)

Question 13

The same signaling molecule that binds to the receptor on the outside of the cell is used to alter gene expression in the nucleus.

Accepted Answer

A) True 
 B)False

Question 14

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) B) and C)
G) A) and C)

Question 15

An isotonic solution means that the solute concentration outside the cell

Accepted Answer

A)  is greater than inside the cell.
B)  is less than inside the cell.
C)  is the same as inside the cell.
D)  has no effect on the cell.
E)  is greater than outside the cell.F) A) and D)
G) B) and C)

Question 16

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) All of the above
G) B) and D)

Question 17

When you cut into most active plant tissue,water appears almost immediately because plant cells contain

Accepted Answer

A)  a hypertonic solution that produces turgor pressure.
B)  a hypotonic solution that produces turgor pressure.
C)  an isotonic condition and you cut the cell open.
D)  a hypertonic condition and cutting it reversed this to hypotonic.
E)  a hypotonic condition and cutting it reversed this to hypertonic.F) A) and B)
G) A) and C)

Question 18

Our body recognizes the foreign nature of a parasite or disease agent and we soon build up antibodies.A few parasites can change their identity to evade our immune system.How could cells do this on a regular basis?

Accepted Answer

A)  Replace the cholesterol within the membrane with host cholesterol.
B)  Wait for the evolution of new protein membrane molecules.
C)  Because the membrane is "set," a cell must reproduce and then the cell with the old membrane must die.
D)  A whole new phospholipid bilayer is generated to replace the old layer.
E)  New glycoproteins are produced in the cell and moved into the plasma membrane.F) A) and D)
G) None of the above

Question 19

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) All of the above
G) C) and D)

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) A) and B)
G) A) and C)

Exam 4: Membrane Structure and Function

An isotonic solution means that the solute concentration outside the cell

Correct AnswerverifiedShow Answer

Which intercellular junction allows for the rapid movement of small molecules or ions to flow from one animal cell to the next?

Correct AnswerverifiedShow Answer

The plasma membrane is composed of

Correct AnswerverifiedShow Answer

Our body recognizes the foreign nature of a parasite or disease agent and we soon build up antibodies.A few parasites can change their identity to evade our immune system.How could cells do this on a regular basis?

Correct AnswerverifiedShow Answer

The number of mitochondria in a cell would be a general indicator of the extent of

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

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

Correct AnswerverifiedShow Answer

The same signaling molecule that binds to the receptor on the outside of the cell is used to alter gene expression in the nucleus.

Correct AnswerverifiedShow Answer

What will happen to dye crystals if placed in the bottom of a beaker of water over a long period of time?

Correct AnswerverifiedShow Answer

When you cut into most active plant tissue,water appears almost immediately because plant cells contain

Correct AnswerverifiedShow Answer

If 0.9% NaCl were isotonic to a cell,then

Correct AnswerverifiedShow Answer

The pressure that is generated when water flows through a differentially permeable membrane is termed

Correct AnswerverifiedShow Answer

One way to determine whether something is being actively transported across a membrane is to compare its rate of transport with and without a chemical that blocks ATP production.

Correct AnswerverifiedShow Answer

The term hypertonic means

Correct AnswerverifiedShow Answer

When an intestinal cell ingests substances inside very small vesicles that can only be seen with an electron microscope,this is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which component of the extracellualr matrix is responsible for forming proteoglycans?

Correct AnswerverifiedShow Answer

Certain individuals with a Y chromosome develop into females because testosterone is not able to induce the formation of male sexual characteristics.This is most likely due to a defect in

Correct AnswerverifiedShow Answer

Which is true of facilitated transport by carrier proteins?

Correct AnswerverifiedShow Answer

Which of the following statements is true regarding the inside and outside of the plasma membrane?

Correct AnswerverifiedShow Answer

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