The phosphate transport system in bacteria imports phosphate (which is small and negatively charged) into the cell even when the concentration of phosphate outside the cell is much lower than the cytoplasmic phosphate concentration. In this case, this phosphate transport would utilize_____.
a) phosphate channels and would require input energy.
b) phosphate pumps and would require input energy.
c) phosphate channels and would not require input energy.
d) phosphate pumps and would not require input energy.
e) More than one of these could be used in the scenario described, equally well.
Answer: B