Question 1
What transports potassium and sodium across plasma membranes?
◦ Passive electrolyte channels
◦ Coupled channels
◦ Adenosine triphosphatase (ATPase) enzyme
◦ Diffusion
Question 2
What occurs during exocytosis?
◦ Macromolecules can be secreted across eukaryotic cell membranes.
◦ All substances are secreted into the cellular matrix.
◦ No repairs in the plasma membrane can take place.
◦ Solute molecules flow freely into and out of the cell.