Write a definition of the word substrate. Describe receptor mediated endocytosis. Adenosine Triphosphate 56. The word amphipathic refers to a molecule that has both hydrophobic and hydrophylic regions. Receptor mediated endocytosis refers to a type of mass transport of material into the cell that is somewhat selective.
Diffusion is passive movement down a concentration gradient.
No membrane or transport proteins are involved. Facilitated diffusion on the other hand is also passive and down gradient but does involve transport through a membrane as well as a transport protein.