PSL 425 Final exam with correct answers 2024

What is the driving force that determines the passive transport of solutes across a permeable membrane? correct answers The electrochemical gradient When a substance is uncharged, as in the case of glucose, when can equilibrium occur? correct answers Only when the concentration is equal on the two sides of the membrane If neither the chemical nor the electrical term in the electrochemical potential energy difference equation is zero, when can equilibrium occur? correct answers The two terms are equal but of opposite sign Which of the following values is unnecessary when finding the equilibrium potential of an ion using the Nernst equation? correct answers The membrane voltage What does the Nernst equation predict for any concentration gradient of a particular ion across a membrane? correct answers The equilibrium potential If movement of a substance across the membrane is not directly coupled to the movement of any other solute or to any other chemical reaction, this transport is called? correct answers Noncoupled transport How is the net flux best determined in terms of influx and efflux? correct answers The sum of influx and efflux What direction will an anion move when the net driving force is negative? correct answers The anion will exit the cell What direction will a cation move when the net driving force is negative? correct answers The cation will enter the cell For equilibrium to occur what must happen? correct answers The net flux must be zero Which answer correctly orders the Nernst potentials of a neuron at 37°C for potassium, sodium, calcium, chloride from depolarized to hyperpolarized? correct answers Ca2+ > Na+ > Cl- > K+ The resting membrane potential is mainly determined by: correct answers The potassium gradient What is the name for the movement of a single ion species through the membrane? correct answers Current