Question 1

Which type of cellular process will most likely be used by an amoeba in order to obtain food?

Accepted Answer

A)   phagocytosis
B)   pinocytosis
C)   exocytosis
D)   receptor-mediated endocytosisE) B) and C)
F) B) and D)

Question 2

In the cells that line the lumen of the small intestine, gap junctions keep materials from the digestive tract from slipping between the cells and entering the tissues.

Accepted Answer

A) True 
 B)False

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)   Proteins and phospholipids can move sideways within the plane of the membrane.E) None of the above
F) C) and D)

Question 4

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 C)
G) B) and D)

Question 5

A 10% glucose solution is placed in the thistle tube. The thistle tube is placed in a beaker that contains a 5% glucose solution. There is a differentially permeable membrane across the broad end of the tube, which is permeable to water but not to the sugar glucose. What will occur over time to the water? To the solute?

Accepted Answer

As time passes, the water will move from...

Question 6

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) B) and C)
G) C) and E)

Question 7

Design an experiment that illustrates how any one of these factors (temperature, pressure, molecule size) may affect the rate of diffusion.

Accepted Answer

Answer may vary. A simple experiment to ...

Question 8

Having similar ____________ would allow tissues and organs to be transplanted easily.

Accepted Answer

A)   cell recognition proteins
B)   major histocompatibility complex proteins
C)   carbohydrate chains in the cell membrane
D)   all of the choices are involved in tissue transplantationE) All of the above
F) B) and C)

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

Before boarding an airplane on a commercial flight, the traveler must show personal identification and a ticket to airport security. The traveler must then remove his shoes and place any carry-on items on the belt of an x-ray machine before walking through the checkpoint. How is the passage of molecules through a membrane similar to travelers passing through airport security?

Accepted Answer

Answers may vary. Airport security could...

Question 11

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

Accepted Answer

A)   endocytosis
B)   exocytosis
C)   pinocytosis
D)   receptor-mediated endocytosisE) None of the above
F) C) and D)

Question 12

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 answer choicesE) C) and D)
F) A) and B)

Question 13

Study the series of pictures to identify the process through which materials are being transported across the membrane. Explain how you arrived at your answer.

Accepted Answer

The process is facilitated transport. Th...

Question 14

Why does this model of a phospholipids bilayer in Fig. 2 not 'work'?

Accepted Answer

This model does not 'work' because it ha...

Question 15

The process by which cholesterol is transported into the cell by the binding of LDL to its receptor and the internalization of the receptor-LDL complex is

Accepted Answer

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

Question 16

What type of transport mechanism is required to move sodium ions against their concentration gradient?

Accepted Answer

A)   active
B)   passive
C)   diffusion
D)   osmosisE) A) and B)
F) A) and C)

Question 17

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) C) and D)
F) B) and D)

Question 18

All life forms currently have a basic cell membrane so we presume that the earliest forms of life had this "fence" isolating the internal organization from the external chaos. It is likely that the primordial environment was acidic. In order for a cell to function in this type of environment, the cell membrane would have to include

Accepted Answer

A)   a sodium (Na+)  pump.
B)   a proton (H+)  pump.
C)   mitochondria underneath in order to provide energy for active transport.
D)   an acid-proof cell wall.
E)   a totally nonpermeable membrane.F) A) and D)
G) D) and E)

Question 19

In the cell pictured, there is no net movement of water. The amount leaving the cell and entering the cell is the same. In what type of environment is this cell found?

Accepted Answer

A)   hypertonic
B)   hypotonic
C)   isotonic
D)   none of the aboveE) B) and C)
F) A) and D)

Question 20

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) B) and C)
F) A) and B)

Exam 5: Membrane Structure and Function

In the cell pictured, there is no net movement of water. The amount leaving the cell and entering the cell is the same. In what type of environment is this cell found?

Correct Answer
verified

Study the series of pictures to identify the process through which materials are being transported across the membrane. Explain how you arrived at your answer.

Correct Answer
verified
The process is facilitated transport. Th...
View Answer

Proteins in a membrane are

Correct Answer
verified

Why does this model of a phospholipids bilayer in Fig. 2 not 'work'?

Correct Answer
verified
This model does not 'work' because it ha...
View Answer

Whether a molecule can cross the plasma membrane depends upon

Correct Answer
verified

Having similar ____________ would allow tissues and organs to be transplanted easily.

Correct Answer
verified

The process by which cholesterol is transported into the cell by the binding of LDL to its receptor and the internalization of the receptor-LDL complex is

Correct Answer
verified

What type of transport mechanism is required to move sodium ions against their concentration gradient?

Correct Answer
verified

Which statement is true about the plasma membrane?

Correct Answer
verified

Correct Answer
verified

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 Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

The major functions of the plasma membrane do NOT include

Correct Answer
verified

Which type of cellular process will most likely be used by an amoeba in order to obtain food?

Correct Answer
verified

Correct Answer
verified
Answers may vary. Airport security could...
View Answer

Design an experiment that illustrates how any one of these factors (temperature, pressure, molecule size) may affect the rate of diffusion.

Correct Answer
verified
Answer may vary. A simple experiment to ...
View Answer

Correct Answer
verified
As time passes, the water will move from...
View Answer

In the cells that line the lumen of the small intestine, gap junctions keep materials from the digestive tract from slipping between the cells and entering the tissues.

Correct Answer
verified

Exam 5: Membrane Structure and Function

In the cell pictured, there is no net movement of water. The amount leaving the cell and entering the cell is the same. In what type of environment is this cell found?

Correct AnswerverifiedShow Answer

Study the series of pictures to identify the process through which materials are being transported across the membrane. Explain how you arrived at your answer.

Correct AnswerverifiedThe process is facilitated transport. Th...View AnswerShow Answer

Proteins in a membrane are

Correct AnswerverifiedShow Answer

Why does this model of a phospholipids bilayer in Fig. 2 not 'work'?

Correct AnswerverifiedThis model does not 'work' because it ha...View AnswerShow Answer

Whether a molecule can cross the plasma membrane depends upon

Correct AnswerverifiedShow Answer

Having similar ____________ would allow tissues and organs to be transplanted easily.

Correct AnswerverifiedShow Answer

The process by which cholesterol is transported into the cell by the binding of LDL to its receptor and the internalization of the receptor-LDL complex is

Correct AnswerverifiedShow Answer

What type of transport mechanism is required to move sodium ions against their concentration gradient?

Correct AnswerverifiedShow Answer

Which statement is true about the plasma membrane?

Correct AnswerverifiedShow Answer

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

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The major functions of the plasma membrane do NOT include

Correct AnswerverifiedShow Answer

Which type of cellular process will most likely be used by an amoeba in order to obtain food?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedAnswers may vary. Airport security could...View AnswerShow Answer

Design an experiment that illustrates how any one of these factors (temperature, pressure, molecule size) may affect the rate of diffusion.

Correct AnswerverifiedAnswer may vary. A simple experiment to ...View AnswerShow Answer

Correct AnswerverifiedAs time passes, the water will move from...View AnswerShow Answer

In the cells that line the lumen of the small intestine, gap junctions keep materials from the digestive tract from slipping between the cells and entering the tissues.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
The process is facilitated transport. Th...
View Answer

Correct Answer
verified

Correct Answer
verified
This model does not 'work' because it ha...
View 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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Answers may vary. Airport security could...
View Answer

Correct Answer
verified
Answer may vary. A simple experiment to ...
View Answer

Correct Answer
verified
As time passes, the water will move from...
View Answer

Correct Answer
verified