I was reading page 92 of Fundamentals of Microbiology, 4th edition, which states
In facilitated diffusion, the substance (glucose, for example) to be transported combines with a plasma membrane protein called a transporter.
The section of text that says this is in a section describing prokaryotic cell anatomy. As far as I understand human biology, (just to use one example) that facilitated diffusion is regulated by insulin, which, to use less than perfect language simply to streamline my question, uses insulin to "unlock" the plasma membrane proteins.
What's the difference when prokaryotic cells aren't dependent upon insulin to get glucose in?