Question 1

You are helping your roommate study for her biology exam.You ask her to draw a picture of a phospholipid bilayer.She draws the phosphate heads pointing inwards and the fatty acid tails pointing outward.Is her drawing accurate? Why or why not? Explain.

Accepted Answer

Her picture does not work because it has...

Question 2

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.The...

Question 3

Why can nonpolar molecules freely cross the cell membrane while polar molecules require energy?

Accepted Answer

Nonpolar molecules tend to be ...

Question 4

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 transplantation.E) B) and C)
F) A) and D)

Question 5

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 either surfaces of the bilayer.
C)  Both answer choices are true.
D)  Neither answer choice is true.E) B) and C)
F) A) and B)

Question 6

Which cell junction will allow the movement of molecules between two plant cells?

Accepted Answer

A)  plasmodesmata
B)  gap
C)  tight
D)  adhesionE) All of the above
F) A) and B)

Question 7

Freshwater protozoans react to a/an ________ environment by removing water through ________.

Accepted Answer

A)  hypertonic; turgor pressure
B)  hypotonic; turgor pressure
C)  isotonic; a contractile vacuole
D)  hypertonic; a contractile vacuole
E)  hypotonic; a contractile vacuoleF) D) and E)
G) A) and E)

Question 8

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

Question 9

Sugars and amino acids are carried into the cell by means of

Accepted Answer

A)  facilitated transport.
B)  diffusion.
C)  endocytosis.
D)  exocytosis.E) None of the above
F) A) and C)

Question 10

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 11

Why do membranes self-assemble into their characteristic phospholipids bilayer?

Accepted Answer

Membranes self-assemble in their charact...

Question 12

Receptor-mediated endocytosis involves the use of specific proteins in the cell membrane.

Accepted Answer

A) True 
 B)False

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

Which of the following is an example of active transport through a cell membrane?

Accepted Answer

A)  movement of carbon dioxide out of the bloodstream and into the lungs
B)  movement of oxygen from the lungs into the bloodstream
C)  movement of sweat onto the surface of your skin
D)  The movement of chlorine ions from an area of low concentration on one side of the membrane to an area of high concentration on the other side of the membrane.E) B) and D)
F) C) and D)

Question 15

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

Accepted Answer

A)  Wilting protects the leaves from full exposure to the salt solution.
B)  Wilting results from an increase in turgor pressure.
C)  Wilting results from the salt weakening the plant cell walls.
D)  Wilting results from the loss of water.E) C) and D)
F) A) and C)

Question 16

Which of the following is true with respect to plant cell walls?

Accepted Answer

A)  They contain n-acetylglutamic acid.
B)  They all have secondary cell walls.
C)  There is a greater amount of cellulose in secondary cell walls than in primary cell walls.
D)  Lignin is found in primary cell walls of plants.E) A) and C)
F) A) and B)

Question 17

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

Question 18

All life forms currently have a basic cell membrane so we hypothesize that the earliest cells also had membranes.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 B)
G) D) and E)

Question 19

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

Question 20

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)  receptor-mediated endocytosis.
E)  exocytosis.F) A) and B)
G) A) and E)

Exam 5: Membrane Structure and Function

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

Correct Answer
verified

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

Correct Answer
verified

Why can nonpolar molecules freely cross the cell membrane while polar molecules require energy?

Correct Answer
verified
Nonpolar molecules tend to be ...
View Answer

Which of the following is an example of active transport through a cell membrane?

Correct Answer
verified

Freshwater protozoans react to a/an environment by removing water through .

Correct Answer
verified

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

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

Proteins in a membrane are

Correct Answer
verified

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

Correct Answer
verified

Which cell junction will allow the movement of molecules between two plant cells?

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.The...
View Answer

Plants show turgor pressure when

Correct Answer
verified

All life forms currently have a basic cell membrane so we hypothesize that the earliest cells also had membranes.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

Correct Answer
verified

Sugars and amino acids are carried into the cell by means of

Correct Answer
verified

Which of the following is true with respect to plant cell walls?

Correct Answer
verified

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

You are helping your roommate study for her biology exam.You ask her to draw a picture of a phospholipid bilayer.She draws the phosphate heads pointing inwards and the fatty acid tails pointing outward.Is her drawing accurate? Why or why not? Explain.

Correct Answer
verified
Her picture does not work because it has...
View Answer

Why do membranes self-assemble into their characteristic phospholipids bilayer?

Correct Answer
verified
Membranes self-assemble in their charact...
View Answer

Receptor-mediated endocytosis involves the use of specific proteins in the cell membrane.

Correct Answer
verified

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

Correct Answer
verified

Exam 5: Membrane Structure and Function

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

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

Why can nonpolar molecules freely cross the cell membrane while polar molecules require energy?

Correct AnswerverifiedNonpolar molecules tend to be ...View AnswerShow Answer

Which of the following is an example of active transport through a cell membrane?

Correct AnswerverifiedShow Answer

Freshwater protozoans react to a/an ________ environment by removing water through ________.

Correct AnswerverifiedShow Answer

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

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

Proteins in a membrane are

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which cell junction will allow the movement of molecules between two plant cells?

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.The...View AnswerShow Answer

Plants show turgor pressure when

Correct AnswerverifiedShow Answer

All life forms currently have a basic cell membrane so we hypothesize that the earliest cells also had membranes.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

Correct AnswerverifiedShow Answer

Sugars and amino acids are carried into the cell by means of

Correct AnswerverifiedShow Answer

Which of the following is true with respect to plant cell walls?

Correct AnswerverifiedShow Answer

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

You are helping your roommate study for her biology exam.You ask her to draw a picture of a phospholipid bilayer.She draws the phosphate heads pointing inwards and the fatty acid tails pointing outward.Is her drawing accurate? Why or why not? Explain.

Correct AnswerverifiedHer picture does not work because it has...View AnswerShow Answer

Why do membranes self-assemble into their characteristic phospholipids bilayer?

Correct AnswerverifiedMembranes self-assemble in their charact...View AnswerShow Answer

Receptor-mediated endocytosis involves the use of specific proteins in the cell membrane.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Nonpolar molecules tend to be ...
View Answer

Correct Answer
verified

Freshwater protozoans react to a/an environment by removing water through .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified
Her picture does not work because it has...
View Answer

Correct Answer
verified
Membranes self-assemble in their charact...
View Answer

Correct Answer
verified

Correct Answer
verified