Question 1

When compared to the solution, the egg that gained weight was ______.

Accepted Answer

A)  Hypertonic
B)  Hypotonic
C)  IsotonicD) A) and C)
E) All of the above

Question 2

If two solutions have unequal concentrations of a solute, the solution with the lower concentration is called

Accepted Answer

A)  isotonic.
B)  hypertonic.
C)  hypotonic.
D)  osmosis.E) C) and D)
F) A) and D)

Question 3

A scientist performs an experiment in which they create an artificial cell with a selectively permeable membrane through which only water can pass.They inject a 5M solution of glucose into the cell and then place the cell into a beaker containing 10M glucose.What effect do you expect to observe?

Accepted Answer

A)  Water moves out of the cell
B)  Glucose moves out of the cell
C)  No net change in cell weight
D)  Water moves into the cellE) A) and C)
F) B) and C)

Question 4

Which mutations can interfere with the proper insertion of a protein in the plasma membrane?

Accepted Answer

A)  A polar amino acid to a non-polar amino acid within a transmembrane domain
B)  A non-polar amino acid to a polar amino acid within a transmembrane domain
C)  A polar amino acid to a non-polar amino acid within a cytoplasmic domain
D)  A non-polar amino acid to a polar amino acid within a cytoplasmic domainE) A) and B)
F) A) and C)

Question 5

The accumulation of amino acids and sugars in animal cells can occur through

Accepted Answer

A)  ATP pumps.
B)  sodium-potassium pumps.
C)  glucose pumps.
D)  coupled transport.E) A) and C)
F) C) and D)

Question 6

A phospholipid molecule has a polar and a nonpolar end.Because of this, water molecules form

Accepted Answer

A)  polar bonds with the nonpolar end of the phospholipid molecule.
B)  polar bonds with the polar end of the phospholipid molecule.
C)  hydrogen bonds with the nonpolar end of the phospholipid molecule.
D)  hydrogen bonds with the polar end of the phospholipid molecule.E) C) and D)
F) B) and D)

Question 7

Red blood cells are bi-concave.Their shape is determined by interior proteins anchored to the membrane termed

Accepted Answer

A)  clathrins.
B)  phospholipids.
C)  cytoskeleton.
D)  spectrins.E) All of the above
F) B) and C)

Question 8

What is the net movement of substances to regions of lower concentration called?

Accepted Answer

A)  Osmosis
B)  Active transport
C)  Facilitation
D)  DiffusionE) C) and D)
F) None of the above

Question 9

Facilitated diffusion is an important method for cells in obtaining necessary molecules and removing other ones.Requirements for facilitated diffusion include

Accepted Answer

A)  The carrier molecule must be specific to the molecule that is transported.The direction of movement is always with the concentration gradient, never against the gradient.
B)  The carrier molecule is nonspecific to the molecule that is transported.The direction of movement is always with the concentration gradient, never against the gradient.
C)  The carrier molecule is nonspecific to the molecule that is transported.The direction of movement is always against the concentration gradient, never with the gradient.
D)  The carrier molecule must be specific to the molecule that is transported and an ATP molecule must be attached to the specific carrier.The direction of movement is always against the concentration gradient, never with the gradient.E) A) and B)
F) A) and D)

Question 10

What initiates the sodium-potassium pump?

Accepted Answer

A)  Three sodium ions bind to the cytoplasmic side of the protein.
B)  Three sodium ions are translocated out of the cell.
C)  Phosphorylated pump has low affinity for sodium allowing sodium to leave and potassium to bind.
D)  Two potassium ions are transported into the cell.E) A) and D)
F) All of the above

Question 11

If Na+ levels were depleted in the extracellular fluid, rate of glucose movement would

Accepted Answer

A)  increase.
B)  decrease.
C)  stay the same.D) All of the above
E) None of the above

Question 12

A symporter is moving glucose and sodium levels are being depleted in extracellular fluids.What can be concluded about the movement of glucose? Choose all that apply.__X__ Glucose would be moving against its gradient into the cell
__X__ Glucose follows the gradient of sodium into the cell
_____ Glucose would be moving with its gradient into the cell
__X__ ATP is not required to move sodium down its concentration gradient
__X__ Energy is needed to move glucose down its concentration gradient
_____ Glucose's movement would still be considered diffusion
__X__ Glucose's movement is considered a part of coupled transport

Accepted Answer

Reflect on Process

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Question 13

If you were to replace the phosphate group of a phospholipid with a fatty acid chain, you would have

Accepted Answer

A)  glycerol.
B)  a triglyceride.
C)  cholesterol.
D)  glycolipid.E) A) and B)
F) A) and C)

Question 14

For the process of diffusion to occur, molecules must

Accepted Answer

A)  move from areas of high concentration to areas of lesser concentration until an equilibrium is reached.
B)  move from areas of low concentration to areas of higher concentration until an equilibrium is reached.
C)  remain stationary until their molecular motion allows for an equilibrium to be reached.
D)  move from areas of high concentration to areas of lesser concentration until facilitated transport can assist the molecular equilibrium.E) A) and C)
F) A) and D)

Question 15

In a single sodium-potassium pump cycle, ATP is used with the result that

Accepted Answer

A)  3 sodium ions leave and 2 potassium ions enter.
B)  2 sodium ion enters and 1 potassium ion leaves.
C)  2 sodium ion leaves and 1 potassium ion enters.
D)  3 sodium ions enter and 2 potassium ions leave.E) A) and B)
F) B) and C)

Question 16

One day during the summer you and some friends make ice cream using an electric ice cream maker.To get the ice cream to form, a mixture of salt and ice is packed around the ice cream maker.A few days later you notice a yellow circle of dead grass where the ice cream maker had been placed.You hypothesize that some of the salt and ice mixture spilled onto the grass and ___.

Accepted Answer

A)  froze the grass
B)  was isosmotic to the grass cells causing the yellow circle of dead grass
C)  was hyperosmotic to the grass cells causing the yellow circle of dead grass
D)  was hypoosmotic to the grass cells causing the yellow circle of dead grassE) A) and C)
F) A) and B)

Question 17

The type of movement of molecules that is specific and passive, and which becomes saturated if all of the protein carriers are in use is

Accepted Answer

A)  exocytosis.
B)  facilitated diffusion.
C)  active transport.
D)  endocytosis.E) A) and B)
F) A) and C)

Question 18

The fluid mosaic model proposed by Singer and Nicolson in 1972 explained that

Accepted Answer

A)  the cell membrane was composed of lipids and proteins.
B)  the cell membrane was composed of a phospholipid bilayer between two layers of globular proteins.
C)  the cell membrane was composed of a phospholipid bilayer with globular proteins actually inserted into the bilayer.
D)  the cell membrane was composed of a phospholipid bilayer but the polar ends of the phospholipid molecules were reversed.E) B) and D)
F) B) and C)

Question 19

To test for the presence of starch, iodine can be used.A positive reaction results in a black color.A dialysis bag filled with starch solution and secured on both ends is placed in iodine solution.After 30 minutes the dialysis bag appears black.Based on this information, what most accurately describes what happened?

Accepted Answer

A)  Due to its size and polarity, starch was able to exit the dialysis bag and interact with the iodine solution.
B)  Due to its size and polarity, iodine was able to enter the dialysis bag and interact with starch.
C)   Over time, both iodine and starch are equally distributed throughout the two solutions.D) B) and C)
E) All of the above

Question 20

While eating lobster for dinner one night your friend asks what you think might happen if this marine invertebrate, which is normally isosmotic with respect to the surrounding seawater, were to be moved to a bay with a slightly lower salt concentration instead of being caught.You reply that, in order for the lobster to be isosmotic with respect to new environment,

Accepted Answer

A)  it must move water in to match the solute concentration of its new environment.
B)  it regulates its internal concentration of solutes to match that of its new environment.
C)  it must move water out to match the solute concentration of its new environment.
D)  it moves water in or out and regulates its internal concentration of water as needed.E) None of the above
F) A) and B)

Exam 5: Membranes

A phospholipid molecule has a polar and a nonpolar end.Because of this, water molecules form

Correct Answer
verified

If two solutions have unequal concentrations of a solute, the solution with the lower concentration is called

Correct Answer
verified

What is the net movement of substances to regions of lower concentration called?

Correct Answer
verified

Facilitated diffusion is an important method for cells in obtaining necessary molecules and removing other ones.Requirements for facilitated diffusion include

Correct Answer
verified

The fluid mosaic model proposed by Singer and Nicolson in 1972 explained that

Correct Answer
verified

The type of movement of molecules that is specific and passive, and which becomes saturated if all of the protein carriers are in use is

Correct Answer
verified

In a single sodium-potassium pump cycle, ATP is used with the result that

Correct Answer
verified

For the process of diffusion to occur, molecules must

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Reflect on Process
Did your problem-sol...
View Answer

Red blood cells are bi-concave.Their shape is determined by interior proteins anchored to the membrane termed

Correct Answer
verified

Correct Answer
verified

When compared to the solution, the egg that gained weight was ______.

Correct Answer
verified

A scientist performs an experiment in which they create an artificial cell with a selectively permeable membrane through which only water can pass.They inject a 5M solution of glucose into the cell and then place the cell into a beaker containing 10M glucose.What effect do you expect to observe?

Correct Answer
verified

If Na⁺ levels were depleted in the extracellular fluid, rate of glucose movement would

Correct Answer
verified

Correct Answer
verified

Which mutations can interfere with the proper insertion of a protein in the plasma membrane?

Correct Answer
verified

If you were to replace the phosphate group of a phospholipid with a fatty acid chain, you would have

Correct Answer
verified

The accumulation of amino acids and sugars in animal cells can occur through

Correct Answer
verified

What initiates the sodium-potassium pump?

Correct Answer
verified

Exam 5: Membranes

A phospholipid molecule has a polar and a nonpolar end.Because of this, water molecules form

Correct AnswerverifiedShow Answer

If two solutions have unequal concentrations of a solute, the solution with the lower concentration is called

Correct AnswerverifiedShow Answer

What is the net movement of substances to regions of lower concentration called?

Correct AnswerverifiedShow Answer

Facilitated diffusion is an important method for cells in obtaining necessary molecules and removing other ones.Requirements for facilitated diffusion include

Correct AnswerverifiedShow Answer

The fluid mosaic model proposed by Singer and Nicolson in 1972 explained that

Correct AnswerverifiedShow Answer

The type of movement of molecules that is specific and passive, and which becomes saturated if all of the protein carriers are in use is

Correct AnswerverifiedShow Answer

In a single sodium-potassium pump cycle, ATP is used with the result that

Correct AnswerverifiedShow Answer

For the process of diffusion to occur, molecules must

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedReflect on Process Did your problem-sol...View AnswerShow Answer

Red blood cells are bi-concave.Their shape is determined by interior proteins anchored to the membrane termed

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

When compared to the solution, the egg that gained weight was ______.

Correct AnswerverifiedShow Answer

A scientist performs an experiment in which they create an artificial cell with a selectively permeable membrane through which only water can pass.They inject a 5M solution of glucose into the cell and then place the cell into a beaker containing 10M glucose.What effect do you expect to observe?

Correct AnswerverifiedShow Answer

If Na+ levels were depleted in the extracellular fluid, rate of glucose movement would

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which mutations can interfere with the proper insertion of a protein in the plasma membrane?

Correct AnswerverifiedShow Answer

If you were to replace the phosphate group of a phospholipid with a fatty acid chain, you would have

Correct AnswerverifiedShow Answer

The accumulation of amino acids and sugars in animal cells can occur through

Correct AnswerverifiedShow Answer

What initiates the sodium-potassium pump?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Reflect on Process
Did your problem-sol...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

If Na⁺ levels were depleted in the extracellular fluid, rate of glucose movement would

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified