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True or False: Sodium-Potassium pumps requrie significant energy to remove potassium from interior of the cell
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- True or False: Passive-mediated transport proteins lower the delta G of transport to create the movement of molecules or ions.Describe the activity of the sodium-potassium pump and indicate its importance to the cell.The free energy change for moving ions across a membrane depends on the concentration on each side of the membrane as well as the membrane potential. True False
- The Na+/K+ ATPase pump is a P-type pump and requires a covalent phosphorylation from a phosphate source like GTP. True FalseWhich of the following would decrease the electrochemical gradient across a membrane? an ion channel lysosome proton pump Na/K pumpIn the Nernst equation [V = 62 log10 (Co / Ci)], the term Co represents: cell bio the intracellular concentration of calcium the extracellular concentration of potassium the extracellular concentration of sodium the intracellular concentration of potassium the membrane potential (in millivolts)
- A secondary active transport protein gets its energy by binding and splitting a molecule of ATP. True Falsesodium rushing into the cell, making the potential difference positiveThe electrochemical gradient across membranes is important in determining movement across membranes for a certain type(s) of solute. Which kind? Both anions and cations Positively charged (cations) Neutral/uncharged solutes Negatively charged (anions)
- "Transporters saturate at high concentrations of the transported molecule when all their binding sites are occupied; channels, on the other hand, do not bind the ions they transport and thus the flux of ions through a channel does not saturate." is true or false.The high affinity ion binding site on P-class pumps is on side of the membrane where the ion is in low concentration. True False"Transport by transporters can be either active or passive, whereas transport by channels is always passive" is true or false.
