A) hydrophilic B) hydrophobic C) amphipathic, v at the very least one hydrophobic region

D) exposed on only one surface of the membrane


2) You have a planar bilayer v equal quantities of saturated and unsaturated phospholipids. After trial and error the permeability that this membrane to glucose, you rise the proportion of unsaturated phospholipids in the bilayer. What will take place to the membrane\"s permeability to glucose?

A) Permeability to glucose will certainly increase. B) Permeability come glucose will decrease. C) Permeability to glucose will stay the same. D) You cannot predict the outcome. Girlfriend simply have to make the measurement.

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3) according to the fluid mosaic design of cabinet membranes, phospholipids _____. A) have the right to move laterally follow me the airplane of the membrane B) commonly flip-flop indigenous one side of the membrane to the other C) take place in an uninterrupted bilayer, through membrane proteins restricted to the surface ar of the membrane

D) have hydrophilic tails in the interior of the membrane


4) The membranes of winter wheat space able to remain fluid when it is very cold by _____. A) increasing the percent of unsaturated phospholipids in the membrane B) enhancing the portion of cholesterol molecule in the membrane C) diminish the number of hydrophobic proteins in the membrane

D) cotransport that glucose and also hydrogen


5) Some areas of the plasma membrane, referred to as lipid rafts, have actually a higher concentration that cholesterol molecules. At higher temperatures, these regions _____. A) are much more fluid 보다 the bordering membrane B) space less liquid than the neighboring membrane

C) detach native the plasma membrane and clog arteries D) have greater rates that lateral diffusion of lipids and proteins into and out of this regions


6) Singer and also Nicolson\"s liquid mosaic design of the membrane proposed that membranes_____. A) are a phospholipid bilayer between two class of hydrophilic proteins B) room a single layer the phospholipids and also proteins C) consists protein molecules installed in a liquid bilayer of phospholipids

D) consist of a mosaic the polysaccharides and also proteins


7) An pet cell doing not have oligosaccharides ~ above the external surface that its plasma membrane would most likely be impaired in i m sorry function?

A) transporting ions versus an electrochemical gradient B) cell-cell recognition

C) it is registered the plasma membrane come the cytoskeleton

D) developing a diffusion obstacle to charged molecules


8) which of these are NOT embedded in the hydrophobic portion of the lipid bilayer at all? A) transmembrane protein B) integral proteins C) peripheral proteins

D) all of these are installed in the hydrophobic part of the lipid bilayer.


9) Why room lipids and proteins cost-free to relocate laterally in membranes? A) The internal of the membrane is filled through liquid water. B) Lipids and proteins repulse each other in the membrane. C) Hydrophilic parts of the lipids room in the interior of the membrane. D) there are just weak hydrophobic interaction in the inner of the membrane.


15) cabinet membranes room asymmetrical. I m sorry of the adhering to statements is the most likely explanation because that the membrane\"s asymmetrical nature? A) since the cell membrane develops a border in between one cell and also another in tightly packed tissues such as epithelium, the membrane need to be asymmetrical

B) since cell membranes interact signals indigenous one organism to another, the cabinet membranes must be asymmetrical. C) The 2 sides of a cell membrane challenge different environments and also carry out different functions.

D) protein only function on the cytoplasmic side of the cell membrane, which outcomes in the membrane\"s asymmetrical nature.


16) In what method do the membranes of a eukaryotic cell vary? A) Phospholipids are found only in details membranes. B) certain proteins are distinct to each membrane. C) Only details membranes the the cell room selectively permeable. D) part membranes have hydrophobic surface exposed to the cytoplasm, when others have hydrophilic surfaces dealing with the cytoplasm.


17) i beg your pardon of the complying with is a reasonable explanation for why unsaturated fat acids assist keep a membrane much more fluid at lower temperatures? A) The double bonds kind kinks in the fatty acid tails, preventing adjacent lipids from pack tightly.

B) Unsaturated fat acids have a greater cholesterol contents and, therefore, an ext cholesterol in membranes. C) Unsaturated fat acids are more polar than saturated fatty acids. D) The twin bonds block interaction among the hydrophilic head teams of the lipids


18) What kinds of molecule pass v a cell membrane many easily?

A) big and hydrophobic B) little and hydrophobic C) big polar

D) ionic


19) i beg your pardon of the following most accurately defines selective permeability? A) An entry of energy is compelled for transport. B) Lipid-soluble molecule pass through a membrane. C) There have to be a concentration gradient because that molecules to pass through a membrane.

D) Only specific molecules deserve to cross a cabinet membrane.


20) i m sorry of the following is a characteristic function of a carrier protein in a plasma membrane?

A) it exhibits a specificity because that a particular kind of molecule. B) It needs the expenditure of cellular energy to function. C) the works against diffusion.

D) It has actually no hydrophobic regions.


21) i m sorry of the adhering to would likely move with the lipid double layer of a plasma membrane many rapidly? A) CO2

B) one amino acid

C) glucose

D) K+


22) i beg your pardon of the following permits water to move much faster across cell membranes?

A) the sodium-potassium pump B) ATP C) peripheral proteins

D) aquaporins


23) You are working top top a team that is making a brand-new drug. For this medicine to work, it must go into the cytoplasm of details target cells. Which of the following would be a variable that determines even if it is the molecule selectively beginning the target cells? A) hydrophobicity the the drug molecule

B) absence of fee on the medicine molecule C) similarity that the medicine molecule to various other molecules transported through the target cells

D) lipid ingredient of the target cells\" plasma membrane


24) Diffusion _____. A) is an extremely rapid over long distances B) requires an expenditure of energy by the cell C) is a passive process in i m sorry molecules relocate from a region of higher concentration come a region of reduced concentration D) requires integral protein in the cabinet membrane


25) i beg your pardon of the following processes includes all others?

A) osmosis B) assisted in diffusion C) passive transport

D) carry of an ion under its electrochemical gradient


26) when a cell is in equilibrium through its environment, i m sorry of the complying with occurs because that substances that deserve to diffuse through the cell? A) there is random movement of building material into and also out that the cell. B) over there is directed activity of building material into and also out of the cell.

C) over there is no activity of building materials into and also out of the cell.

D) All activity of molecule is directed by active transport.


27) i beg your pardon of the following is true that osmosis? A) Osmosis only takes location in red blood cells. B) Osmosis is an energy-demanding or \"active\" process. C) In osmosis, water moves across a membrane from locations of lower solute concentration to locations of greater solute concentration. D) In osmosis, solutes move across a membrane from locations of lower water concentration to locations of greater water concentration.


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The solutions in the two arms of this U-tube space separated through a membrane that is permeable come water and also glucose but not come sucrose. Side A is half-filled through a equipment of 2 M sucrose and also 1 M glucose. Next B is half-filled with 1 M sucrose and also 2 M glucose. Initially, the liquid levels top top both sides space equal.

28) refer t o the figure. Initially, in terms of tonicity, the equipment in side A through respect come the equipment in next B is _____.

A) hypotonic B) isotonic

C) saturation D) hypertonic


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The options in the two arms of this U-tube are separated through a membrane that is permeable to water and glucose yet not come sucrose. Next A is half-filled v a equipment of 2 M sucrose and 1 M glucose. Side B is half-filled through 1 M sucrose and also 2 M glucose. Initially, the liquid levels top top both sides are equal.

29) describe the figure. After the mechanism reaches equilibrium, what transforms are observed?

A) The molarity that sucrose is higher than that of glucose on side A. B) The water level is greater in side A 보다 in side B. C) The water level is unchanged.

D) The water level is higher in side B than in side A.


30) A patient was associated a serious accident and lost a large quantity of blood. In an attempt to replenish human body fluids, distilled water—equal come the volume of blood lost—is added to the blood straight via among his veins. What will certainly be the most probable an outcome of this transfusion? A) The patient\"s red blood cells will shrivel up due to the fact that the blood has come to be hypotonic contrasted to the cells.

B) The patient\"s red blood cells will certainly swell and also possibly burst because the blood has end up being hypotonic compared to the cells. C) The patient\"s red blood cells will shrivel up due to the fact that the blood has become hypertonic contrasted to the cells.

D) The patient\"s red blood cells will certainly burst because the blood has end up being hypertonic contrasted to the cells.


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The services in the arms of a U-tube are separated in ~ the bottom the the tube by a selectively permeable membrane. The membrane is permeable to salt chloride however not to glucose. Next A is filled with a systems of 0.4 M glucose and 0.5 M salt chloride (NaCl), and side B is filled v a systems containing 0.8 M glucose and also 0.4 M salt chloride. Initially, the volume in both eight is the same..

31) refer to the figure. In ~ the start of the experiment,

A) side A is hypertonic to side B. B) side A is hypotonic to next B. C) side A is hypertonic to next B through respect come glucose.

D) side A is hypotonic to side B through respect come NaCl.


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32) refer to the figure. If you examine side A after 3 days, friend should uncover _____. A) a to decrease in the concentration the NaCl and glucose and an increase in the water level

B) a decrease in the concentration of NaCl, boost in water level, and no readjust in the concentration of glucose C) a decrease in the concentration that NaCl and also a diminish in the water level D) no change in the concentration that NaCl and also glucose and rise in the water level


36) Celery stalks that space immersed in new water for several hours become stiff. Similar stalks left in a 0.15 M salt solution become limp. From this we have the right to deduce that the new water_____.

A) and the salt solution room both hypertonic come the cell of the celery stalks B) is hypotonic and the salt solution is hypertonic to the cells of the celery stalks

C) is hypertonic and the salt solution is hypotonic to the cell of the celery stalks

D) is isotonic and also the salt solution is hypertonic come the cells of the celery stalks


37) What will happen to a red blood cabinet (RBC), which has actually an inner ion concentration of about 0.9 percent, if that is inserted into a beaker of pure water? A) The cell would shrink because the water in the beaker is hypotonic relative to the cytoplasm of the RBC.

B) The cell would shrink since the water in the maker is hypertonic loved one to the cytoplasm that the RBC. C) The cell would swell due to the fact that the water in the manufacturer is hypotonic relative to the cytoplasm that the RBC.

D) The cabinet will remain the very same size since the solution exterior the cabinet is isotonic.


38) which of the adhering to statements correctly describes the regular tonicity problems for usual plant and also animal cells? The animal cell is in _____. A) a hypotonic solution, and also the plant cabinet is in one isotonic solution B) one isotonic solution, and also the plant cell is in a hypertonic solution

C) a hypertonic solution, and also the plant cabinet is in an isotonic solution

D) an isotonic solution, and also the plant cell is in a hypotonic solution


39) In i beg your pardon of the adhering to would over there be the biggest need because that osmoregulation?

A) an pet connective organization cell bathed in isotonic body fluid B) a salmon moving from a river into an s C) a red blood cell surrounding by plasma

D) a plant gift grown hydroponically in a watery mixture of designated nutrients


40) when a tree cell, such as one indigenous a increased stem, is submerged in a very hypotonic solution, what is most likely to occur? A) The cell will certainly burst. B) Plasmolysis will shrink the interior.

C) The cabinet will end up being flaccid. D) The cell will become turgid.


41) A sodium-potassium pump _____. A) moves 3 potassium ions out that a cell and also two salt ions right into a cabinet while producing an ATP because that each cycle B) move three sodium ion out of a cell and two potassium ions into a cell while spend an ATP for each cycle C) moves three potassium ions out that a cell and two sodium ions right into a cabinet while spend 2 ATP in every cycle D) relocate three sodium ions out that a cell and two potassium ions into a cell and generates an ATP in every cycle


42) The sodium-potassium pump is dubbed an electrogenic pump because it _____.

A) pumps equal quantities of Na+ and K+ throughout the membrane B) contributes to the membrane potential C) ionizes sodium and also potassium atom D) is used to journey the move of various other molecules against a concentration gradient


43) i beg your pardon of the complying with membrane tasks requires power from ATP? A) assisted in diffusion the chloride ions across the membrane v a chloride channel

B) movement of Na+ ion from a lower concentration in a mammalian cabinet to a higher concentration in the extracellular fluid C) movement of glucose molecules right into a bacterial cabinet from a medium containing a greater concentration the glucose than inside the cell D) motion of carbon dioxide out of a paramecium


44) The voltage throughout a membrane is dubbed the _____.

A) chemistry gradient B) membrane potential C) osmotic potential

D) electrochemical gradient


45) ion diffuse across membranes through specific ion networks down _____.

A) your chemical gradients B) their concentration gradients C) the electric gradients

D) their electrochemical gradients


46) which of the following would rise the electrochemical gradient across a membrane? A) a sucrose-proton cotransporter B) a proton pump C) a potassium channel

D) both a proton pump and also a potassium channel


47) The phosphate transport device in bacteria imports phosphate into the cell also when the concentration that phosphate outside the cell is much reduced than the cytoplasmic phosphate concentration. Phosphate import relies on a pH gradient throughout the membrane—more acidic external the cell than inside the cell. Phosphate transport is an example of _____.

A) passive diffusion B) promoted diffusion C) active transport D) cotransport


48) In part cells, there are numerous ion electrochemical gradients throughout the plasma membrane also though there space usually just one or two proton pumps existing in the membrane. The gradients of the various other ions are most most likely accounted because that by _____. A) cotransport proteins

B) ion channels C) pores in the plasma membrane D) passive diffusion throughout the plasma membrane


49) i beg your pardon of the complying with is most likely true of a protein the cotransports glucose and also sodium ions right into the intestinal cell of an animal? A) Sodium and glucose complete for the same binding website in the cotransporter. B) Glucose start the cell under its concentration gradient provides power for absorb of sodium ions against the electrochemical gradient.

C) salt ions can move down their electrochemical gradient with the cotransporter even if it is or not glucose is existing outside the cell. D) A substance that blocks sodium ion from binding come the cotransport protein will also block the transfer of glucose.


50) Proton pumps are used in various means by members that every domain the organisms: Bacteria, Archaea, and Eukarya. What does this most probably mean? A) Proton gradients across a membrane were supplied by cells the were the common ancestor of all three domains of life.

B) The high concentration of protons in the old atmosphere must have actually necessitated a pump mechanism. C) cell of each domain progressed proton pumps individually when oceans became more acidic.

D) Proton pumps are necessary to every cell membranes.


51) numerous epidemic microbial conditions of earlier centuries incurred high death rates since they caused severe dehydration because of vomiting and diarrhea. Now they are usually not fatal because we have occurred which that the following? A) antiviral drugs that space efficient and work fine with most viruses B) intravenous feeding methods C) drugs to slow-moving blood lose D) hydrating drinks with high concentration of salts and also glucose


52) The force driving basic diffusion is _____, while the energy source for energetic transport is _____. A) the concentration gradient; ADP B) the concentration gradient; ATP

C) transmembrane pumps; electron deliver D) phosphorylated protein carriers; ATP


53) an organism with a cell wall surface would most likely be unable to take in materials through _____.

A) osmosis B) energetic transport C) phagocytosis

D) promoted diffusion


54) White blood cells engulf bacteria using _____.

A) phagocytosis B) pinocytosis C) osmosis

D) receptor-mediated exocytosis


55) Familial hypercholesterolemia is characterized by _____. A) defective LDL receptor on the cabinet membranes B) negative attachment that the cholesterol come the extracellular procession of cell C) a poorly developed lipid bilayer that cannot incorporate cholesterol into cell membranes D) inhibition the the cholesterol energetic transport device in red blood cells


56) The difference in between pinocytosis and receptor-mediated endocytosis is that _____. A) pinocytosis brings only water molecules right into the cell, but receptor-mediated endocytosis brings in other molecules together well. B) pinocytosis increases the surface ar area the the plasma membrane, whereas receptor-mediated endocytosis decreases the plasma membrane surface area. C) pinocytosis is nonselective in the molecule it brings right into the cell, whereas receptor-mediated endocytosis offers an ext selectivity. D) pinocytosis have the right to concentrate substances native the extracellular fluid, yet receptor-mediated endocytosis cannot.


57) In receptor-mediated endocytosis, receptor molecules initially project to the outside of the cell. Where perform they finish up ~ endocytosis? A) ~ above the exterior of engine B) ~ above the inside surface ar of the cell membrane

C) on the inside surface ar of the vesicle D) on the external surface the the nucleus


58) A bacterium engulfed through a white blood cell with phagocytosis will be digested by enzymes included in _____. A) lyosome B) Golgi vesicles

C) vacuoles D) secretory vesicles


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Human immunodeficiency virus (HIV) infects cell that have both CD4 and CCR5 cell surface ar molecules. The viral nucleic mountain molecules are enclosed in a protein capsid, and the protein capsid is itself contained inside one envelope consists of a lipid bilayer membrane and viral glycoproteins. One hypothesis for famous entry into cells is that binding of HIV membrane glycoproteins to CD4 and CCR5 initiates fusion of the HIV membrane v the plasma membrane, release the viral capsid into the cytoplasm. An alternative hypothesis is the HIV benefit entry into the cabinet via receptor-mediated endocytosis, and membrane combination occurs in the endocytotic vesicle. To test these alternate hypotheses for HIV entry, researchers labeled the lipids top top the HIV membrane through a red fluorescent dye.

59) In one HIV-infected cell developing HIV virus particles, the viral glycoprotein is expressed on the plasma membrane. How do the famous glycoproteins acquire to the plasma membrane? They are synthesized _____. A) on ribosome on the plasma membrane

B) by ribosomes in the unstable ER and also arrive at the plasma membrane in the membrane that secretory engine C) on complimentary cytoplasmic ribosomes and also then inserted into the plasma membrane D) by ribosom in the stormy ER, secreted from the cell, and inserted into the plasma membrane indigenous the outside


Human immunodeficiency virus (HIV) infects cells that have actually both CD4 and CCR5 cell surface molecules. The famous nucleic mountain molecules room enclosed in a protein capsid, and the protein capsid is itself contained inside one envelope consist of of a lipid double layer membrane and viral glycoproteins. One hypothesis for famous entry right into cells is that binding the HIV membrane glycoproteins to CD4 and also CCR5 initiates combination of the HIV membrane v the plasma membrane, releasing the viral capsid into the cytoplasm. An alternate hypothesis is that HIV profit entry right into the cell via receptor-mediated endocytosis, and membrane blend occurs in the endocytotic vesicle. To check these alternative hypotheses because that HIV entry, researchers labeled the lipids top top the HIV membrane with a red fluorescent dye.

60) What would certainly be observed by live-cell fluorescence microscopy instantly after HIV entry if HIV is endocytosed first, and also then later fuses through the endocytotic vesicle membrane? A) A clues of red fluorescence will certainly be visible on the infected cell\"s plasma membrane, marking the site of membrane blend and HIV entry.

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B) The red fluorescent dye-labeled lipids will appear in the infected cell\"s interior. C) A clues of red fluorescence will diffuse in the infected cell\"s cytoplasm. D) A clues of red fluorescence will remain external the cabinet after transporting the famous capsid.