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31) The concentration of sodium is greater in the extracellular fluid compared to the intracellular fluid. If the membrane potential was equal to the equilibrium potential for sodium, then what would be the direction of the electrochemical force acting on sodium?A) inwardB) outwardC) no forceD) varies by cellE) varies based on concentration of potassium in the intracellular and extracellular fluidsAnswer: CDiff: 5 Page Ref: 9932) One way that membrane surface area is increased in absorptive cells is through increasing the ________ of the apical membrane.DDiff: 4 Page Ref: 10433) When a substance crossing the membrane is driven by diffusion, the net flux of that moleculecan be described mathematically by ________.BDiff: 6 Page Ref: 10434) Sodium permeability refers to a property of ________.DDiff: 6 Page Ref: 1048
35) Which of the following will NOT increase the net flux of an ion across a membrane?A) elevated permeability of the membraneB) increased concentration gradient across the membraneC) enhanced surface areaD) more channels for that ion in the membraneE) reduced surface areaAnswer: EDiff: 4 Page Ref: 10436) Molecules with a relatively high lipid solubility are capable of crossing the membrane ________.ADiff: 5 Page Ref: 10437) Which of the following molecules is least likely to diffuse through the phospholipid bilayer of the plasma membrane?CDiff: 5 Page Ref: 10438) Which of the following is NOT true for all three of the following transport mechanisms: facilitated diffusion, primary active transport, and secondary active transport?DDiff: 5 Page Ref: 1069
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Atom, Electric charge, Cell Membrane Transport, Ion