Question 1

If a cell lacks ATP, which of the following processes would cease to operate immediately?

Accepted Answer

A)   diffusion
B)   sodium/potassium pump
C)   facilitated diffusion
D)   osmosis
E)   tonicityF) A) and E)
G) B) and E)

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) A) and E)
G) B) and E)

Question 3

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 explain this?

Accepted Answer

A)   a receptor molecule that is always turned on
B)   a receptor molecule that is always turned off
C)   a transduction pathway that is always turned off
D)   a target protein that is always deactivated
E)   a gene for cell division that is not expressed when it should beF) All of the above
G) C) 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)   outer and inner sides of the plasma membrane have identical carbohydrate chains
E)   the fluid-mosaic nature of the membraneF) B) and D)
G) B) and C)

Question 5

Exocytosis is carried out by proteins in the cell membrane.

Accepted Answer

A) True 
 B)False

Question 6

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

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

Question 7

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 8

A student sitting in 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 phenomenon 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) B) and E)
G) A) and E)

Question 9

Two solutions are separated by a selectively permeable membrane. On side A, there is a solution composed of 20% protein and 80% water. On side B, the solution is 100% water. Initially, the solution on side B is ________ to the solution on side A.

Accepted Answer

A)   hypotonic
B)   hypertonic
C)   isotonicD) All of the above
E) A) and C)

Question 10

When water enters a plant cell

Accepted Answer

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

Question 11

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

Accepted Answer

A)   Both the inside and outside of the phospholipid bilayer are identical.
B)   There are phospholipids on both sides of the membrane, but cytoskeletal filaments are present on the outside and carbohydrates and glycolipids are present on the inside.
C)   There are phospholipids on both sides of the membrane, but cytoskeletal filaments are present on the inside and carbohydrates and glycolipids are present on the outside.
D)   The inside consists of a phospholipid bilayer while the outside consists of a layer of carbohydrates and glycolipids.
E)   The outside consists of a phospholipid bilayer while the inside consists of a layer of proteins.F) A) and E)
G) A) and D)

Question 12

The definition of osmosis is the

Accepted Answer

A)   the movement of solute molecules from a higher concentration to a lower concentration.
B)   diffusion of water across a selectively permeable membrane.
C)   likelihood that water will diffuse in a particular direction.
D)   lower concentration of a solute in a solution.
E)   movement of water toward a low solute concentration.F) C) and D)
G) B) and C)

Question 13

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

Question 14

Which of the following are functions of the plasma membrane? Select all that apply.

Accepted Answer

A)   It separates the internal environment of the cell from the external environment.
B)   It regulates the entrance and exit of molecules to and from the cell.
C)   It helps the cell and the organism maintain a steady internal environment.
D)   It serves as a site for protein synthesis.
E)   It serves as the site for photosynthesis in plant cells.F) B) and E)
G) A) and D)

Question 15

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 the cell membrane by facilitated transport.
E)   must be engulfed by a cell using endocytosis.F) A) and E)
G) A) and D)

Question 16

Two solutions are separated by a selectively permeable membrane. On side A, there is a solution composed of 20% protein and 80% water. On side B, the solution is 100% water. As osmosis occurs, what will happen to the solution on side A?

Accepted Answer

A)   It will become less concentrated since protein will move from A to B.
B)   It will become more concentrated since water passes from B to A.
C)   It will become more concentrated since water passes from A to B.
D)   It will become less concentrated since water passes from B to A.
E)   It will become more concentrated since protein will move from B to A.F) A) and E)
G) B) and D)

Question 17

What two components are commonly found in the extracellular matrix that help resist stretching and provide resilience?

Accepted Answer

A)   proteins and polysaccharides
B)   proteins and phospholipids
C)   polysaccharides and phospholipids
D)   amino acids and phospholipids
E)   nucleic acids and proteinsF) None of the above
G) C) and D)

Question 18

When a plant cell is placed in a hypotonic solution, the cell wall prevents

Accepted Answer

A)   diffusion.
B)   active transport.
C)   the cell from bursting.
D)   the cell from shrinking.
E)   water from entering the cell.F) A) and B)
G) B) and D)

Question 19

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

Accepted Answer

A)   a differentially permeable membrane
B)   low temperatures
C)   a concentration difference
D)   a non-permeable membrane
E)   a living cellF) A) and E)
G) C) and D)

Question 20

If the proteins forming the cell junctions within the stomach were denatured, what is a likely consequence?

Accepted Answer

A)   The desmosome junctions would not hold together, causing the cells in the stomach to pull apart.
B)   The tight junctions would not hold together, causing the cells in the stomach to pull apart.
C)   The desmosome junctions would be bonded together more tightly, causing the cells in the stomach to form a solid barrier.
D)   The gap junctions would not hold together, causing the cells in the stomach to be unable to pass ions back and forth.
E)   The desmosome junctions would not hold together, causing the cells in the kidney to pull apart.F) C) and D)
G) C) and E)

Exam 4: Membrane Structure and Function

The term hypertonic means

Correct AnswerverifiedShow Answer

If a cell lacks ATP, which of the following processes would cease to operate immediately?

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Two solutions are separated by a selectively permeable membrane. On side A, there is a solution composed of 20% protein and 80% water. On side B, the solution is 100% water. As osmosis occurs, what will happen to the solution on side A?

Correct AnswerverifiedShow Answer

Two solutions are separated by a selectively permeable membrane. On side A, there is a solution composed of 20% protein and 80% water. On side B, the solution is 100% water. Initially, the solution on side B is ________ to the solution on side A.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

If the proteins forming the cell junctions within the stomach were denatured, what is a likely consequence?

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

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 explain this?

Correct AnswerverifiedShow Answer

What two components are commonly found in the extracellular matrix that help resist stretching and provide resilience?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following are functions of the plasma membrane? Select all that apply.

Correct AnswerverifiedShow Answer

When water enters a plant cell

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Exocytosis is carried out by proteins in the cell membrane.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The definition of osmosis is the

Correct AnswerverifiedShow Answer

A student sitting in 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 phenomenon was due to

Correct AnswerverifiedShow Answer

When a plant cell is placed in a hypotonic solution, the cell wall prevents

Correct AnswerverifiedShow Answer

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