Indicate whether the statements below are true or false. If a statement is false, explain why it is ...

Indicate whether the statements below are true or false. If a statement is false, explain why it is false.
 
  A. Facilitated diffusion can be described as the favorable movement of one solute down its concentration gradient being coupled with the unfavorable movement of a second solute up its concentration gradient.
  B. Transporters undergo transitions between different conformations, depending on whether the substrate-binding pocket is empty or occupied.
  C. The electrochemical gradient for K+ across the plasma membrane is small. Therefore, any movement of K+ from the inside to the outside of the cell is driven solely by its concentration gradient.
  D. The net negative charge on the cytosolic side of the membrane enhances the rate of glucose import into the cell by a uniporter.