Question 1
At rest, most cells have a voltage of ________ mV.
Question 2
A cell membrane that is selectively permeable
◦ can change which substances pass through by changing its lipid and protein content.
◦ is impermeable to all substances but water.
◦ randomly chooses which substances will pass through.
◦ will only allow substances in or out if their concentration in the cell is above or below a certain point.