The Phosphate Transport System in Bacteria Imports Phosphate into the Cell

The phosphate transport system in bacteria imports phosphate into the cell even when the concentration of phosphate outside the cell is much lower than the cytoplasmic phosphate concentration. Because phosphate import depends on a pH gradient across the membrane, phosphate transport is most likely an example of which of the following transport processes?

A) passive diffusion
B) facilitated diffusion
C) active transport
D) cotransport

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