Each method of passage through the cell membrane might be useful to different molecules. Facilitated diffusion is passive transport that uses integral membrane proteins to help larger, charged, hydrophilic, and polar molecules across a concentration gradient.Remember that integral membrane proteins span the phospholipid bilayer, connecting the inside and the outside of the cell.iffusion across a cell membrane is a type of passive transport, or transport across the cell membrane that does not require energy.
Voice actors. Optimus Prime is primarily voiced by Peter Cullen in most of his incarnations, who voiced him in the original series. Following the production of the 2007 film, Cullen reprised his role for the sequels and supporting media and would even voice Optimus in later series such as Transformers: Prime.
Rumored among the cast of robots for the next film in the series are Ultra Magnus, Blitzwing, Scourge, Cyclonus, Override, and Red Alert. Fans of the classic animated Transformers film will remember Ultra Magnus as the one Optimus Prime put in charge right before he died. This could be reflected in the story when the Transformers 5 release date arrives, with Optimus Prime off to confront the creators while Ultra Magnus takes command on Earth.