Final answer:
Cholesterol is not a protein transporter in the plasma membrane. Concentration gradients can be a source of potential energy.
Step-by-step explanation:
The statement 'Cholesterol is a protein transporter in the plasma membrane' is false.
Cholesterol is actually a lipid molecule that is an integral part of the plasma membrane. It is embedded within the tail bilayer of the membrane. Cholesterol provides stability and fluidity to the membrane and helps regulate the movement of other molecules in and out of the cell.
Concentration gradients can indeed be a source of potential energy for true. When there is a difference in concentration between two areas, substances will naturally move from an area of higher concentration to an area of lower concentration. This movement along the concentration gradient can be harnessed to do work and provide energy for various cellular processes.