Question

multiple choice question
substances like oxygen, carbon dioxide and water move across a bacterial cell membrane by ______.

facilitated transport
active transport
group translocation
passive diffusion

Explanation:

Small, non-polar (oxygen, carbon dioxide) and small polar (water) molecules move across bacterial cell membranes via passive diffusion, a spontaneous process that does not require energy or transport proteins, moving down their concentration gradients. The other options require energy or specialized proteins, which are not needed for these substances.

Answer:

passive diffusion