Question 1

Fluidity of a membrane increases as the percentage of unsaturated fatty acids in the phospholipids goes up.

Accepted Answer

A) True 
 B)False

Question 2

In the sodium-potassium pump,sodium is transported out of the cell and potassium is transported into the cell as ATP is broken by a membrane protein.

Accepted Answer

A) True 
 B)False  True

Question 3

Which statement is true about the plasma membrane?

Accepted Answer

A)  The proteins make up the matrix of the membrane.
B)  The model can be likened to a sandwich where phospholipids are like the bread and proteins are like the filling.
C)  The fluid nature of the membrane is regulated by flip-flopping of the phospholipids from one side of the membrane to the other.
D)  The movement of proteins and phospholipids can occur sideways within the plane of the membrane.E) A) and B)
F) None of the above

Question 4

Which of the following is the reason plants wilt if they are watered with a salt solution?

Accepted Answer

A)  to protect the leaves from full exposure to the salt.
B)  an increase in turgor pressure.
C)  salt weakens the plant cell walls.
D)  loss of water due to the salt solution resulting in a decrease in turgor pressure.E) A) and B)
F) None of the above

Question 5

Which is the best definition of osmosis?

Accepted Answer

A)  The movement of molecules from an area of their higher concentration to an area of their lower concentration.
B)  The movement of water across a semi permeable membrane from an area of higher water concentration to an area of lower water concentration.
C)  The movement of molecules from an area of their lower concentration to an area of their higher concentration.
D)  The movement of water across a semi permeable membrane from an area of lower water concentration to an area of higher water concentration.
E)  The movement of a substance against its concentration gradient through the release of energy from ATP.F) All of the above
G) C) and D)

Question 6

Why is the energy expended during endocytosis worth it?

Accepted Answer

A)  The cell increases the amount of ATP produced in order to complete endocytosis.
B)  The contents drawn into the cell are isolated from the cytoplasm preventing them from altering the cells function.
C)  The cell expends such a small amount of energy to run endocytosis it doesn't really matter.
D)  There is no energy expenditure during endocytosis.E) C) and D)
F) B) and D)

Question 7

Which type of junctions will create a solid barrier to prevent molecules from moving between the cells?

Accepted Answer

A)  gap
B)  desmosomes
C)  tight
D)  plasmodesmata IncorrectE) C) and D)
F) A) and D)

Question 8

The major functions of the plasma membrane do NOT include

Accepted Answer

A)  separation of the fluid environments inside and outside the cell.
B)  regulation of molecules and ions that pass into and out of the cell.
C)  recognition and communication between different cells and tissues.
D)  maintaining connections between adjacent cells.
E)  production of proteins used in construction of the cell wall.F) B) and E)
G) A) and B)

Question 9

Plants show turgor pressure when

Accepted Answer

A)  cells are losing water from their water vacuoles.
B)  cells contain water vacuoles that are full of water.
C)  water is being used up in photosynthesis.
D)  water is being evaporated from the leaves.E) B) and C)
F) A) and B)

Question 10

Imagine a person has a genetic disorder that prevents them from producing the protein collagen,what types of cellular issues will they be faced with?

Accepted Answer

A)  The cell will not have the ability to divide properly.
B)  The cell will not have the ability to regulate the movement of molecules through the membrane.
C)  The cell would not be recognized by the body's immune system.
D)  The cell would not have the ability to resist stretching.
E)  All of the choices are plausible.F) B) and C)
G) C) and D)

Question 11

Whether a molecule can cross the plasma membrane depends upon

Accepted Answer

A)  the size of the molecule.
B)  the shape of the molecule.
C)  the chemical properties of the molecule.
D)  the charge of the molecule.
E)  All of the choices are correct.F) A) and E)
G) B) and C)

Question 12

Which of the following situations is most likely to produce a heart attack?

Accepted Answer

A)  The gap junctions have collapsed and they do not allow the correct flow of ions from one cell to the next.
B)  The plasmodesmata have collapsed and they do not allow the correct flow of ions from one cell to the next.
C)  The tight junction has ripped and is allowing ions to leak through the membrane lining the heart.
D)  The cell walls have broken down and are not able to support the heart.E) A) and D)
F) C) and D)

Question 13

Which scenario is most likely to occur if the mitochondria in the kidney cells were to decrease in function?

Accepted Answer

A)  The kidneys would improve in function.
B)  The kidneys would begin excreting large amounts of waste products.
C)  The amount of active transport in the kidneys would significantly decrease.
D)  The amount of active transport in the kidneys would increase.E) A) and B)
F) A) and C)

Question 14

Red blood cells come in many "blood types" including type A,type B,type AB,type O [lacking proteins A and B],Rh positive,and Rh negative [lacking Rh+] and many others.If blood is transfused,the recipient detects any new or "foreign" proteins.These blood type proteins are

Accepted Answer

A)  in the plasma where they have been secreted by the red blood cells.
B)  inside the red blood cell cytoplasm.
C)  on the outer surface of the red blood cell membrane.
D)  evenly distributed throughout the cell contents and plasma.
E)  in the red blood cell nucleus.F) A) and B)
G) A) and C)

Question 15

A 10% glucose solution is placed in the thistle tube.The thistle tube is placed in a beaker that contains a 5% glucose solution.Where is the highest concentration of water found?

Accepted Answer

A)  In the 10% solution
B)  In the 5% solution
C)  The concentration of water is the same in both solutions.
D)  None of the aboveE) A) and B)
F) None of the above

Question 16

If a cell is placed in a hypotonic solution,which will occur?

Accepted Answer

A)  Salts will move into the cell from the surrounding solution.
B)  Water will move into the cell from the surrounding solution.
C)  Salts will move out of the cell into the surrounding solution.
D)  Water will move out of the cell into the surrounding solution.
E)  None of the choices will occur.F) None of the above
G) C) and D)

Question 17

An extracellular matrix helps some cells to adhere to neighboring cells.

Accepted Answer

A) True 
 B)False  True

Question 18

Which process is responsible for moving cellular wastes across the cell membrane?

Accepted Answer

A)  endocytosis
B)  exocytosis
C)  pinocytosis
D)  receptor-mediated endocytosisE) All of the above
F) A) and B) B

Question 19

Proteins in a membrane are:

Accepted Answer

A)  peripheral if they are on the inside surface held in place by the cytoskeleton.
B)  integral if they are embedded in the membrane and protrude from both surfaces of the bilayer.
C)  integral if they protrude from only one surface of the bilayer.
D)  All of the choices are correct.E) A) and D)
F) B) and C)

Question 20

A 10% glucose solution is placed in the thistle tube.The thistle tube is placed in a beaker that contains a 5% glucose solution.The solution in the thistle tube is _______ to the solution in the beaker.

Accepted Answer

A)  Hypertonic
B)  Hypotonic
C)  Isotonic
D)  None of the aboveE) A) and B)
F) B) and C)

Exam 5: Membrane Structure and Function

Fluidity of a membrane increases as the percentage of unsaturated fatty acids in the phospholipids goes up.

Correct AnswerverifiedShow Answer

In the sodium-potassium pump,sodium is transported out of the cell and potassium is transported into the cell as ATP is broken by a membrane protein.

Correct AnswerverifiedTrue

Which statement is true about the plasma membrane?

Correct AnswerverifiedShow Answer

Which of the following is the reason plants wilt if they are watered with a salt solution?

Correct AnswerverifiedShow Answer

Which is the best definition of osmosis?

Correct AnswerverifiedShow Answer

Why is the energy expended during endocytosis worth it?

Correct AnswerverifiedShow Answer

Which type of junctions will create a solid barrier to prevent molecules from moving between the cells?

Correct AnswerverifiedShow Answer

The major functions of the plasma membrane do NOT include

Correct AnswerverifiedShow Answer

Plants show turgor pressure when

Correct AnswerverifiedShow Answer

Imagine a person has a genetic disorder that prevents them from producing the protein collagen,what types of cellular issues will they be faced with?

Correct AnswerverifiedShow Answer

Whether a molecule can cross the plasma membrane depends upon

Correct AnswerverifiedShow Answer

Which of the following situations is most likely to produce a heart attack?

Correct AnswerverifiedShow Answer

Which scenario is most likely to occur if the mitochondria in the kidney cells were to decrease in function?

Correct AnswerverifiedShow Answer

Red blood cells come in many "blood types" including type A,type B,type AB,type O [lacking proteins A and B],Rh positive,and Rh negative [lacking Rh+] and many others.If blood is transfused,the recipient detects any new or "foreign" proteins.These blood type proteins are

Correct AnswerverifiedShow Answer

A 10% glucose solution is placed in the thistle tube.The thistle tube is placed in a beaker that contains a 5% glucose solution.Where is the highest concentration of water found?

Correct AnswerverifiedShow Answer

If a cell is placed in a hypotonic solution,which will occur?

Correct AnswerverifiedShow Answer

An extracellular matrix helps some cells to adhere to neighboring cells.

Correct AnswerverifiedTrue

Which process is responsible for moving cellular wastes across the cell membrane?

Correct AnswerverifiedB

Proteins in a membrane are:

Correct AnswerverifiedShow Answer

A 10% glucose solution is placed in the thistle tube.The thistle tube is placed in a beaker that contains a 5% glucose solution.The solution in the thistle tube is _______ to the solution in the beaker.

Correct AnswerverifiedShow Answer

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True

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Red blood cells come in many "blood types" including type A,type B,type AB,type O [lacking proteins A and B],Rh positive,and Rh negative [lacking Rh⁺] and many others.If blood is transfused,the recipient detects any new or "foreign" proteins.These blood type proteins are

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True

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B

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