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.
Optimus Prime is the leader of the Autobots, the last Prime, and the half brother of the Decepticon leader Megatron. Biography. Optimus was mentored by Sentinel Prime, the last Prime before him, and eventually became the leader of the Cybertronian scientific devision, while Megatron became Lord High Protector of Cybertron. When Megatron was corrupted by The Fallen and formed the Decepticons, Optimus rose up against him in a vicious war.