Archive for December 2016

Different individuals have different reasons for wanting to buy. Therefore, the salesperson must:

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Different individuals have different reasons for wanting to buy. Therefore, the salesperson must:




a) make sure his sales presentation appeals to all possible wants/needs
b) rely on the prospect to see that the good or service will satisfy her relevant want/need
c) determine the prospects needs; then match the product's benefits to that prospects wants/needs
d) be sure to have his product available to the prospect when the relevant want occurs










Answer: C

Which of the following is an example of a product feature:

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Which of the following is an example of a product feature:






a) "This automatic lawn sprinkling system will save you three hours a week."
b) "More customers will be drawn into your restaurant if you advertise in our magazie."
c) "This monitor comes in 15-inch, 18-inch, and 22-inch sizes."
d) "Chefs prefer our line of cookware 2 to 1 over comepting brands."
e) none of the above







Answer: C

A product benefit is defined as:

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A product benefit is defined as:






a) A performance characteristic of a product
b) a favorable result the buyer receives from use of the product
c) a physical characteristic
d) a way a product will work
e) none of the above








Answer: B

A salesperson can uncover important buying needs by:

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A salesperson can uncover important buying needs by:






a) observing the prospect
b) asking the prospect questions
c) asking others questions about the prospect
d) listening to what the prospect says
e) any or all of the above











Answer: E

A product feature is defined as:

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A product feature is defined as:





a) a characteristic of the product that is not special enough to be called a benefit
b) a performance characteristic of a product
c) a way in which the product will help the buyer
d) any physical characteristic of a product
e) a favorable result the buyer receives from the product







Answer: D

Chasmine has just walked into her local Serta mattress outlet and told the salesperson, "I'd like to buy a new mattress, and I want a pillow-top mattress with individually wrapped coils and a 5 year warranty. What can you show me?" At what level of need awareness is Chasmine?

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Chasmine has just walked into her local Serta mattress outlet and told the salesperson, "I'd like to buy a new mattress, and I want a pillow-top mattress with individually wrapped coils and a 5 year warranty. What can you show me?" At what level of need awareness is Chasmine?




a) conscious
b) reconscious
c) subconscious








Answer: A

In the early 80s, court decisions and legislative rulings limited the power of the employer to terminate-at-will. Under the new limited power, _______ would be an acceptable reason to terminate a salesperson.

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In the early 80s, court decisions and legislative rulings limited the power of the employer to terminate-at-will. Under the new limited power, _______ would be an acceptable reason to terminate a salesperson.






a) excessive absenteeism
b) generally poor organizational citezenship
c) poor performance
d) unsafe conduct
e) all of the above









Answer: E

A _______ code of ethics generally outlines the procedures to be sued in specific ethical situations-- such as how to handle a key customer that suggests the sale might be made sooner if he or she were to receive a kickback.

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A _______ code of ethics generally outlines the procedures to be sued in specific ethical situations-- such as how to handle a key customer that suggests the sale might be made sooner if he or she were to receive a kickback.





a) operational
b) tactical
c) credo-based
d) principle-based
e) policy-based






Answer: E

Under some circumstances, a supplier may be in violation of the Robinson-Patman Act if it is engaged in __________ and gives some customers promotional allowances and support while not making other customers aware of the existence of these opportunities.

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Under some circumstances, a supplier may be in violation of the Robinson-Patman Act if it is engaged in __________ and gives some customers promotional allowances and support while not making other customers aware of the existence of these opportunities. 






a) customer discrimination
b) selective discounting
c) functional discounting
d) exclusive dealing
e) price discrimination









Answer: E

Which of the following would be an example of a salesperson who is moonlighting unethically?

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Which of the following would be an example of a salesperson who is moonlighting unethically?





a) a pharmaceutical salesperson who sales antiques on the internet
b) a computer software salesperson taking a weekend MBA program
c) a restaurant equipment salesperson who tries to sell vacation real estate to some of his present customers
d) a fire equipment salesperson who demonstrates her equipment to prospects by setting real fires
e) a retail sales clerk who tells his wife when store sales are scheduled before they are announced to the public








Answer: C

A key account is a(n):

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A key account is a(n):






a) account that the salesperson asks the manager to remove from his/her territory, usually because of its low volume
b) small account that a salesperson typically handles by telephone from his or her home
c) account located in the same city as the salesperson's place of residence
d) term used to describe accounts that are straight rebuy
e) large account handled by someone from the home office








Answer: E

According to the text, a(n) ___________ refers to something that provides the correct action to take in any situation and never gets tailored to fit a situation.

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According to the text, a(n) ___________ refers to something that provides the correct action to take in any situation and never gets tailored to fit a situation.



a) situational barometer
b) ethical continuum
c) ethical talisman
d) fixed point of reference
e) situational compass









Answer: D

If a manufacturer requires that its wholesalers and retailers buy merchandise only from it, the contract is a(n) ___________ contract, and if the contract tends to lessen competition, it is prohibited under the Clayton Act.

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If a manufacturer requires that its wholesalers and retailers buy merchandise only from it, the contract is a(n) ___________ contract, and if the contract tends to lessen competition, it is prohibited under the Clayton Act.





a) product discrimination
b) reciprocity
c) exclusive dealership
d) deceptive slotting





Answer: C


Which of the following statements about selling is true?

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Which of the following statements about selling is true?





a) You are not involved in sales when you go to an interview with a potential employer.
b) Unlike other professions, journalists do not engage in selling activities.
c) Everyone sells at their place of work, but not at home with their families.
d) You are involved in selling when you ask someone to accompany you on a shopping trip.
e) Only trained salespeople ever engage in selling activities.








Answer: D

Order-takers:

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Order-takers:




a) use creative sales strategies
b) have an infinitely more difficult selling situation than order-getters
c) usually earn much more than order-getters
d) rely on well-executed sales presentation
e) are accurately described by none of the above









Answer: E

Relationship selling:

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Relationship selling:






a) creates social responsibility
b) eliminates cognitive dissonance
c) is another term for reciprocal selling arrangements
d) creates customer loyalty
e) only occurs with transaction selling







Answer: D

Selling occurs:

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Selling occurs:





a) when you go to interview with a potential employer
b) when lawyers try to convince clients to sue
c) when you ask someone to accompany you on a shopping trip
d) when a journalist is trying to get an interview with Mel Gibson
e) in all of the above







Answer: E

A person may choose a sales career because he or she desires:

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A person may choose a sales career because he or she desires:





a) a job that is unchaging and requires mastery of a minimal number of skills
b) the rewards offered by a career in sales
c) the freedom of being self employed
d) the restricted opportunities for advancement
e) all of the above









Answer: B

You are working on a team that is designing a new drug. In order for this drug to work, it must enter the cytoplasm of specific target cells. Which of the following would be a factor that determines whether the molecule selectively enters the target cells?

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You are working on a team that is designing a new drug. In order for this drug to work, it must enter the cytoplasm of specific target cells. Which of the following would be a factor that determines whether the molecule selectively enters the target cells? 






A) blood or tissue type of the patient
B) hydrophobicity of the drug molecule
C) lack of charge on the drug molecule
D) similarity of the drug molecule to other molecules transported by the target cells
E) lipid composition of the target cells' plasma membrane






Answer: D

A patient has had a serious accident and lost a lot of blood. In an attempt to replenish body fluids, distilled water–equal to the volume of blood lost–is transferred directly into one of his veins. What will be the most probable result of this transfusion?

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A patient has had a serious accident and lost a lot of blood. In an attempt to replenish body fluids, distilled water–equal to the volume of blood lost–is transferred directly into one of his veins. What will be the most probable result of this transfusion? 







A) It will have no unfavorable effect as long as the water is free of viruses and bacteria.
B) The patient's red blood cells will shrivel up because the blood fluid has become hypotonic compared to the cells.
C) The patient's red blood cells will swell because the blood fluid has become hypotonic compared to the cells.
D) The patient's red blood cells will shrivel up because the blood fluid has become hypertonic compared to the cells.
E) The patient's red blood cells will burst because the blood fluid has become hypertonic compared to the cells.



Answer: C

In the small airways of the lung, a thin layer of liquid is needed between the epithelial cells and the mucus layer in order for cilia to beat and move the mucus and trapped particles out of the lung. One hypothesis is that the volume of this airway surface liquid is regulated osmotically by transport of sodium and chloride ions across the epithelial cell membrane. How would the lack of a functional chloride channel in cystic fibrosis patients affect sodium ion transport and the volume of the airway surface liquid?

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In the small airways of the lung, a thin layer of liquid is needed between the epithelial cells and the mucus layer in order for cilia to beat and move the mucus and trapped particles out of the lung. One hypothesis is that the volume of this airway surface liquid is regulated osmotically by transport of sodium and chloride ions across the epithelial cell membrane. How would the lack of a functional chloride channel in cystic fibrosis patients affect sodium ion transport and the volume of the airway surface liquid? 






A) Sodium ion transport will increase; higher osmotic potential will increase airway surface liquid volume.
B) Sodium ion transport will increase; higher osmotic potential will decrease airway surface liquid volume.
C) Sodium ion transport will decrease; lower osmotic potential will decrease airway surface liquid volume.
D) Sodium ion transport will decrease; lower osmotic potential will increase the airway surface liquid volume.
E) Sodium ion transport will be unaffected; lack of chloride transport still reduces osmotic potential and decreases the airway surface liquid volume.





Answer: C

If the sodium ion concentration outside the cell increases, and the CFTR channel is open, in what direction will chloride ions and water move across the cell membrane?

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If the sodium ion concentration outside the cell increases, and the CFTR channel is open, in what direction will chloride ions and water move across the cell membrane? 





A) Chloride ions will move out of the cell, and water will move into the cell.
B) Both chloride ions and water will move out of the cell.
C) Chloride ions will move into the cell, and water will move out of the cell.
D) Both chloride ions and water will move into the cell.
E) The movement of chloride ions and water molecules will not be affected by changes in sodium ion concentration outside the cell.





Answer: B

Cystic fibrosis is a genetic disease in humans in which the CFTR protein, which functions as a chloride ion channel, is missing or nonfunctional in cell membranes. The CFTR protein belongs to what category of membrane proteins?

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Cystic fibrosis is a genetic disease in humans in which the CFTR protein, which functions as a chloride ion channel, is missing or nonfunctional in cell membranes.
The CFTR protein belongs to what category of membrane proteins? 





A) gap junctions
B) aquaporins
C) electrogenic ion pumps
D) cotransporters
E) hydrophilic channels






Answer: C

In receptor-mediated endocytosis, receptor molecules initially project to the outside of the cell. Where do they end up after endocytosis?

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In receptor-mediated endocytosis, receptor molecules initially project to the outside of the cell. Where do they end up after endocytosis? 






A) on the outside of vesicles
B) on the inside surface of the cell membrane
C) on the inside surface of the vesicle
D) on the outer surface of the nucleus
E) on the ER






Answer: C

The difference between pinocytosis and receptor-mediated endocytosis is that

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The difference between pinocytosis and receptor-mediated endocytosis is that 







A) pinocytosis brings only water molecules into the cell, but receptor-mediated endocytosis brings in other molecules as well.
B) pinocytosis increases the surface area of the plasma membrane whereas receptor-mediated endocytosis decreases the plasma membrane surface area.
C) pinocytosis is nonselective in the molecules it brings into the cell, whereas receptor-mediated endocytosis offers more selectivity.
D) pinocytosis requires cellular energy, but receptor-mediated endocytosis does not.
E) pinocytosis can concentrate substances from the extracellular fluid, but receptor-mediated endocytosis cannot.







Answer: C

Familial hypercholesterolemia is characterized by which of the following?

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Familial hypercholesterolemia is characterized by which of the following? 







A) defective LDL receptors on the cell membranes
B) poor attachment of the cholesterol to the extracellular matrix of cells
C) a poorly formed lipid bilayer that cannot incorporate cholesterol into cell membranes
D) inhibition of the cholesterol active transport system in red blood cells
E) a general lack of glycolipids in the blood cell membranes







Answer: A

Several epidemic microbial diseases of earlier centuries incurred high death rates because they resulted in severe dehydration due to vomiting and diarrhea. Today they are usually not fatal because we have developed which of the following?

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Several epidemic microbial diseases of earlier centuries incurred high death rates because they resulted in severe dehydration due to vomiting and diarrhea. Today they are usually not fatal because we have developed which of the following? 





A) antiviral medications that are efficient and work well with all viruses
B) antibiotics against the viruses in question
C) intravenous feeding techniques
D) medication to prevent blood loss
E) hydrating drinks that include high concentrations of salts and glucose






Answer: E

Proton pumps are used in various ways by members of every domain of organisms: Bacteria, Archaea, and Eukarya. What does this most probably mean?

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Proton pumps are used in various ways by members of every domain of organisms: Bacteria, Archaea, and Eukarya. What does this most probably mean? 






A) Proton pumps must have evolved before any living organisms were present on Earth.
B) Proton gradients across a membrane were used by cells that were the common ancestor of all three domains of life.
C) The high concentration of protons in the ancient atmosphere must have necessitated a pump mechanism.
D) Cells of each domain evolved proton pumps independently when oceans became more acidic.
E) Proton pumps are necessary to all cell membranes.







Answer: B

The sodium-potassium pump in animal cells requires cytoplasmic ATP to pump ions across the plasma membrane. When the proteins of the pump are first synthesized in the rough ER, what side of the ER membrane will the ATP binding site be on?

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The sodium-potassium pump in animal cells requires cytoplasmic ATP to pump ions across the plasma membrane. When the proteins of the pump are first synthesized in the rough ER, what side of the ER membrane will the ATP binding site be on? 




A) It will be on the cytoplasmic side of the ER.
B) It will be on the side facing the interior of the ER.
C) It could be facing in either direction because proteins are properly reoriented in the Golgi apparatus.
D) It doesn't matter, because the pump is not active in the ER.






Answer: A

Ions diffuse across membranes through specific ion channels

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Ions diffuse across membranes through specific ion channels 







A) down their chemical gradients.
B) down their concentration gradients.
C) down the electrical gradients.
D) down their electrochemical gradients.
E) down the osmotic potential gradients.







Answer: D

The movement of potassium into an animal cell requires

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The movement of potassium into an animal cell requires 






A) low cellular concentrations of sodium.
B) high cellular concentrations of potassium.
C) an energy source such as ATP.
D) a cotransport protein.
E) a potassium channel protein.







Answer: C

Which of the following is most likely true of a protein that cotransports glucose and sodium ions into the intestinal cells of an animal?

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Which of the following is most likely true of a protein that cotransports glucose and sodium ions into the intestinal cells of an animal? 






A) The sodium ions are moving down their electrochemical gradient while glucose is moving up.
B) Glucose entering the cell along its concentration gradient provides energy for uptake of sodium ions against the electrochemical gradient.
C) Sodium ions can move down their electrochemical gradient through the cotransporter whether or not glucose is present outside the cell.
D) The cotransporter can also transport potassium ions.
E) A substance that blocks sodium ions from binding to the cotransport protein will also block the transport of glucose.






Answer: E

The sodium-potassium pump is called an electrogenic pump because it

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The sodium-potassium pump is called an electrogenic pump because it 






A) pumps equal quantities of Na? and K? across the membrane.
B) pumps hydrogen ions out of the cell.
C) contributes to the membrane potential.
D) ionizes sodium and potassium atoms.
E) is used to drive the transport of other molecules against a concentration gradient.







Answer: C

In most cells, there are electrochemical gradients of many ions across the plasma membrane even though there are usually only one or two electrogenic pumps present in the membrane. The gradients of the other ions are most likely accounted for by

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In most cells, there are electrochemical gradients of many ions across the plasma membrane even though there are usually only one or two electrogenic pumps present in the membrane. The gradients of the other ions are most likely accounted for by 






A) cotransport proteins.
B) ion channels.
C) carrier proteins.
D) passive diffusion across the plasma membrane.
E) cellular metabolic reactions that create or destroy ions.







Answer: A

Glucose diffuses slowly through artificial phospholipid bilayers. The cells lining the small intestine, however, rapidly move large quantities of glucose from the glucose-rich food into their glucose-poor cytoplasm. Using this information, which transport mechanism is most probably functioning in the intestinal cells?

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Glucose diffuses slowly through artificial phospholipid bilayers. The cells lining the small intestine, however, rapidly move large quantities of glucose from the glucose-rich food into their glucose-poor cytoplasm. Using this information, which transport mechanism is most probably functioning in the intestinal cells? 





A) simple diffusion
B) phagocytosis
C) active transport pumps
D) exocytosis
E) facilitated diffusion





Answer: E

The phosphate transport system in bacteria imports phosphate into the cell even when the concentration of phosphate outside the cell is much lower than the cytoplasmic phosphate concentration. Phosphate import depends on a pH gradient across the membrane–more acidic outside the cell than inside the cell. Phosphate transport is an example of

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The phosphate transport system in bacteria imports phosphate into the cell even when the concentration of phosphate outside the cell is much lower than the cytoplasmic phosphate concentration. Phosphate import depends on a pH gradient across the membrane–more acidic outside the cell than inside the cell. Phosphate transport is an example of 






A) passive diffusion.
B) facilitated diffusion.
C) active transport.
D) osmosis.
E) cotransport.





Answer: E

Which of the following membrane activities require energy from ATP hydrolysis?

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Which of the following membrane activities require energy from ATP hydrolysis? 






A) facilitated diffusion of chloride ions across the membrane through a chloride channel
B) movement of water into a cell
C) Na? ions moving out of a mammalian cell bathed in physiological saline
D) movement of glucose molecules into a bacterial cell from a medium containing a higher concentration of glucose than inside the cell
E) movement of carbon dioxide out of a paramecium





Answer: C

In which of the following would there be the greatest need for osmoregulation?

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In which of the following would there be the greatest need for osmoregulation? 





A) an animal connective tissue cell bathed in isotonic body fluid
B) cells of a tidepool animal such as an anemone
C) a red blood cell surrounded by plasma
D) a lymphocyte before it has been taken back into lymph fluid
E) a plant being grown hydroponically (in a watery mixture of designated nutrients)







Answer: B

Which of the following statements correctly describes the normal tonicity conditions for typical plant and animal cells?

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Which of the following statements correctly describes the normal tonicity conditions for typical plant and animal cells?





A) The animal cell is in a hypotonic solution, and the plant cell is in an isotonic solution.
B) The animal cell is in an isotonic solution, and the plant cell is in a hypertonic solution.
C) The animal cell is in a hypertonic solution, and the plant cell is in an isotonic solution.
D) The animal cell is in an isotonic solution, and the plant cell is in a hypotonic solution.
E) The animal cell is in a hypertonic solution, and the plant cell is in a hypotonic solution.






Answer: D

Mammalian blood contains the equivalent of 0.15 M NaCl. Seawater contains the equivalent of 0.45 M NaCl. What will happen if red blood cells are transferred to seawater?

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Mammalian blood contains the equivalent of 0.15 M NaCl. Seawater contains the equivalent of 0.45 M NaCl. What will happen if red blood cells are transferred to seawater? 





A) Water will leave the cells, causing them to shrivel and collapse.
B) NaCl will be exported from the red blood cells by facilitated diffusion.
C) The blood cells will take up water, swell, and eventually burst.
D) NaCl will passively diffuse into the red blood cells.
E) The blood cells will expend ATP for active transport of NaCl into the cytoplasm.






Answer: A

Celery stalks that are immersed in fresh water for several hours become stiff and hard. Similar stalks left in a 0.15 M salt solution become limp and soft. From this we can deduce that the cells of the celery stalks are

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Celery stalks that are immersed in fresh water for several hours become stiff and hard. Similar stalks left in a 0.15 M salt solution become limp and soft. From this we can deduce that the cells of the celery stalks are 






A) hypotonic to both fresh water and the salt solution.
B) hypertonic to both fresh water and the salt solution.
C) hypertonic to fresh water but hypotonic to the salt solution.
D) hypotonic to fresh water but hypertonic to the salt solution.
E) isotonic with fresh water but hypotonic to the salt solution.





Answer: C

Water passes quickly through cell membranes because

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Water passes quickly through cell membranes because 





A) the bilayer is hydrophilic.
B) it moves through hydrophobic channels.
C) water movement is tied to ATP hydrolysis.
D) it is a small, polar, charged molecule.
E) it moves through aquaporins in the membrane.






Answer: E

Which of the following statements is correct about diffusion?

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Which of the following statements is correct about diffusion? 





A) It is very rapid over long distances.
B) It requires an expenditure of energy by the cell.
C) It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.
D) It is an active process in which molecules move from a region of lower concentration to one of higher concentration.
E) It requires integral proteins in the cell membrane.







Answer: C

Which of the following is a characteristic feature of a carrier protein in a plasma membrane?

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Which of the following is a characteristic feature of a carrier protein in a plasma membrane? 






A) It is a peripheral membrane protein.
B) It exhibits a specificity for a particular type of molecule.
C) It requires the expenditure of cellular energy to function.
D) It works against diffusion.
E) It has few, if any, hydrophobic amino acids.






Answer: B

Why are lipids and proteins free to move laterally in membranes?

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Why are lipids and proteins free to move laterally in membranes? 






A) The interior of the membrane is filled with liquid water.
B) Lipids and proteins repulse each other in the membrane.
C) Hydrophilic portions of the lipids are in the interior of the membrane.
D) There are only weak hydrophobic interactions in the interior of the membrane.
E) Molecules such as cellulose can pull them in various directions.






Answer: D

Which of the following is true of the evolution of cell membranes?

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Which of the following is true of the evolution of cell membranes? 






A) Cell membranes have stopped evolving now that they are fluid mosaics.
B) Cell membranes cannot evolve if the membrane proteins do not.
C) The evolution of cell membranes is driven by the evolution of glycoproteins and glycolipids.
D) All components of membranes evolve in response to natural selection.
E) An individual organism selects its preferred type of cell membrane for particular functions.








Answer: D

In a paramecium, cell surface integral membrane proteins are synthesized

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In a paramecium, cell surface integral membrane proteins are synthesized 





A) in the cytoplasm by free ribosomes.
B) by ribosomes in the nucleus.
C) by ribosomes bound to the rough endoplasmic reticulum.
D) by ribosomes in the Golgi vesicles.
E) by ribosomes bound to the inner surface of the plasma membrane.







Answer: C

In the years since the proposal of the fluid mosaic model of the cell membrane, which of the following observations has been added to the model?

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In the years since the proposal of the fluid mosaic model of the cell membrane, which of the following observations has been added to the model? 






A) The membrane is only fluid across a very narrow temperature range.
B) Proteins rarely move, even though they possibly can do so.
C) Unsaturated lipids are excluded from the membranes.
D) The concentration of protein molecules is now known to be much higher.
E) The proteins are known to be made of only acidic amino acids.







Answer: D

An animal cell lacking oligosaccharides on the external surface of its plasma membrane would likely be impaired in which function?

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An animal cell lacking oligosaccharides on the external surface of its plasma membrane would likely be impaired in which function? 





A) transporting ions against an electrochemical gradient
B) cell-cell recognition
C) maintaining fluidity of the phospholipid bilayer
D) attaching to the cytoskeleton
E) establishing the diffusion barrier to charged molecules







Answer: B

The primary function of polysaccharides attached to the glycoproteins and glycolipids of animal cell membranes is

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The primary function of polysaccharides attached to the glycoproteins and glycolipids of animal cell membranes is 





A) to facilitate diffusion of molecules down their concentration gradients.
B) to actively transport molecules against their concentration gradients.
C) to maintain the integrity of a fluid mosaic membrane.
D) to maintain membrane fluidity at low temperatures.
E) to mediate cell-to-cell recognition.






Answer: E

Which of the following is true of integral membrane proteins?

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Which of the following is true of integral membrane proteins? 





A) They lack tertiary structure.
B) They are loosely bound to the surface of the bilayer.
C) They are usually transmembrane proteins.
D) They are not mobile within the bilayer.
E) They serve only a structural role in membranes.







Answer: C

Which of the following is a reasonable explanation for why unsaturated fatty acids help keep any membrane more fluid at lower temperatures?

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Which of the following is a reasonable explanation for why unsaturated fatty acids help keep any membrane more fluid at lower temperatures? 






A) The double bonds form kinks in the fatty acid tails, preventing adjacent lipids from packing tightly.
B) Unsaturated fatty acids have a higher cholesterol content and therefore more cholesterol in membranes.
C) Unsaturated fatty acids are more polar than saturated fatty acids.
D) The double bonds block interaction among the hydrophilic head groups of the lipids.
E) The double bonds result in shorter fatty acid tails and thinner membranes.





Answer: A

When a membrane is freeze-fractured, the bilayer splits down the middle between the two layers of phospholipids. In an electron micrograph of a freeze-fractured membrane, the bumps seen on the fractured surface of the membrane are

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When a membrane is freeze-fractured, the bilayer splits down the middle between the two layers of phospholipids. In an electron micrograph of a freeze-fractured membrane, the bumps seen on the fractured surface of the membrane are 





A) peripheral proteins.
B) phospholipids.
C) carbohydrates.
D) integral proteins.
E) cholesterol molecules.






Answer: D

Which of the following is one of the ways that the membranes of winter wheat are able to remain fluid when it is extremely cold?

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Which of the following is one of the ways that the membranes of winter wheat are able to remain fluid when it is extremely cold? 






A) by increasing the percentage of unsaturated phospholipids in the membrane
B) by increasing the percentage of cholesterol molecules in the membrane
C) by decreasing the number of hydrophobic proteins in the membrane
D) by cotransport of glucose and hydrogen
E) by using active transport






Answer: A

According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids?

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According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids? 





A) They can move laterally along the plane of the membrane.
B) They frequently flip-flop from one side of the membrane to the other.
C) They occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane.
D) They are free to depart from the membrane and dissolve in the surrounding solution.
E) They have hydrophilic tails in the interior of the membrane.






Answer: A
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