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AP Bio - Chapter 5 Quiz
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Fragen in diesem Quiz (16)
1Which of the following types of molecules are the major structural components of the cell membrane?
- Aphospholipids and cellulose
- Bnucleic acids and proteins
- Cphospholipids and proteins
- Dproteins and cellulose
- Eglycoproteins and cholesterol
2According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids?
- AThey can move laterally along the plane of the membrane.
- BThey frequently flip-flop from one side of the membrane to the other.
- CThey occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane.
- DThey are free to depart from the membrane and dissolve in the surrounding solution.
- EThey have hydrophilic tails in the interior of the membrane.
3In order for a protein to be an integral membrane protein it would have to be which of the following?
- Ahydrophilic
- Bhydrophobic
- Camphipathic
- Dcompletely covered with phospholipids
- Eexposed on only one surface of the membrane
4Which of the following is true of integral membrane proteins?
- AThey lack tertiary structure.
- BThey are loosely bound to the surface of the bilayer.
- CThey are usually transmembrane proteins.
- DThey are not mobile within the bilayer.
- EThey serve only a structural role in membranes.
5Of the following functions, which is most important for the glycoproteins and glycolipids of animal cell membranes?
- Afacilitated diffusion of molecules down their concentration gradients
- Bactive transport of molecules against their concentration gradients
- Cmaintaining the integrity of a fluid mosaic membrane
- Dmaintaining membrane fluidity at low temperatures
- Ea cell's ability to distinguish one type of neighboring cell from another
6Which of these are not embedded in the lipid bilayer at all?
- Atransmembrane proteins
- Bintegral proteins
- Cperipheral proteins
- Dintegrins
- EExtracellular matrix fibers
7Which of these often serve as receptors or cell recognition molecules on cell surfaces?
- Atransmembrane proteins
- Bintegral proteins
- Cperipheral proteins
- Dintegrins
- Eglycoproteins
8Which of the following is true of the evolution of cell membranes?
- ACell membranes have stopped evolving now that they are fluid mosaics.
- BCell membranes cannot evolve if proteins do not.
- CThe evolution of cell membranes is driven by the evolution of glycoproteins and glycolipids.
- DAs populations of organisms evolve, different properties of their cell membranes are selected for or against.
- EAn individual organism selects its preferred type of cell membrane for particular functions.
9What kinds of molecules pass through a cell membrane most easily?
- Alarge and hydrophobic
- Bsmall and hydrophobic
- Clarge polar
- Dionic
- Emonosaccharides such as glucose
10Which of the following statements is correct about diffusion?
- AIt is very rapid over long distances.
- BIt requires an expenditure of energy by the cell.
- CIt is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.
- DIt is an active process in which molecules move from a region of lower concentration to one of higher concentration.
- EIt requires integral proteins in the cell membrane.
11Water passes quickly through cell membranes because
- Athe bilayer is hydrophilic.
- Bit moves through hydrophobic channels.
- Cwater movement is tied to ATP hydrolysis.
- Dit is a small, polar, charged molecule.
- Eit moves through aquaporins in the membrane.
12The solutions in the two arms of this U-tube are separated by a membrane that is permeable to water and glucose but not to sucrose. Side A is half filled with a solution of 2 M sucrose and 1 M glucose. Side B is half filled with 1 M sucrose and 2 M glucose. Initially, the liquid levels on both sides are equal.
Initially, in terms of tonicity, the solution in side A with respect to that in side B is
- Ahypotonic
- Bplasmolyzed.
- Cisotonic.
- Dsaturated
- Ehypertonic.
13The solutions in the two arms of this U-tube are separated by a membrane that is permeable to water and glucose but not to sucrose. Side A is half filled with a solution of 2 M sucrose and 1 M glucose. Side B is half filled with 1 M sucrose and 2 M glucose. Initially, the liquid levels on both sides are equal.
After the system reaches equilibrium, what changes are observed?- AThe molarity of sucrose is higher in side A than in side B.
- BThe molarity of glucose is higher in side A than in side B.
- CThe water level is higher in side A than in side B.
- DThe water level is unchanged.
- EThe water level is higher in side B than in side A.
14The solutions in the two arms of this U-tube are separated by a membrane that is permeable to water and glucose but not to sucrose. Side A is half filled with a solution of 2 M sucrose and 1 M glucose. Side B is half filled with 1 M sucrose and 2 M glucose. Initially, the liquid levels on both sides are equal.
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?- AIt will have no unfavorable effect as long as the water is free of viruses and bacteria.
- BThe patient's red blood cells will shrivel up because the blood fluid is hypotonic compared to the cells.
- CThe patient's red blood cells will swell because the blood fluid is hypotonic compared to the cells.
- DThe patient's red blood cells will shrivel up because the blood fluid is hypertonic compared to the cells.
- EThe patient's red blood cells will burst because the blood fluid is hypertonic compared to the cells.
15The solutions in the two arms of this U-tube are separated by a membrane that is permeable to water and glucose but not to sucrose. Side A is half filled with a solution of 2 M sucrose and 1 M glucose. Side B is half filled with 1 M sucrose and 2 M glucose. Initially, the liquid levels on both sides are equal.
Celery stalks that are immersed in fresh water for several hours become stiff and hard. Similar stalks left in a salt solution become limp and soft. From this we can deduce that the cells of the celery stalks are- Ahypotonic to both fresh water and the salt solution.
- Bhypertonic to both fresh water and the salt solution.
- Chypertonic to fresh water but hypotonic to the salt solution.
- Dhypotonic to fresh water but hypertonic to the salt solution.
- Eisotonic with fresh water but hypotonic to the salt solution.
16The solutions in the arms of a U-tube are separated at the bottom of the tube by a selectively permeable membrane. The membrane is permeable to sodium chloride but not to glucose. Side A is filled with a solution of 0.4 M glucose and 0.5 M sodium chloride (NaCl), and side B is filled with a solution containing 0.8 M glucose and 0.4 M sodium chloride. Initially, the volume in both arms is the same.
At the beginning of the experiment,- Aside A is hypertonic to side B.
- Bside A is hypotonic to side B.
- Cside A is isotonic to side B.
- Dside A is hypertonic to side B with respect to glucose.
- Eside A is hypotonic to side B with respect to sodium chloride.
Informationen
- Beschreibung
- (not finished - 16/46 questions)
- Autor
- Katelynne Tomasek
- Sprache
- English
- Aufrufe
- 57
- Schlagwörter
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