>>11603272wow you should really take biochemistry or cell bio dawg. exo/endocytosis is MEMBRANE TRANSPORT. what you're showing is a transmembrane channel protein which is activated by whatever "X" is supposed to represent. technically it's facilitated diffusion since it's presumed the small molecules are polar.
let's break this down. Active transport is active, meaning it requires energy to transport. that is not the case here, because the binding of 'X' induces a conformational change in the TM protein that allows it to "open up" (details are slightly more complicated). This conformational change is basically an induced fold change that is caused by the binding of 'X' to protein. I'm not going to bother explaining that more than this, buy a biochem textbook.
therefor, it's passive diffusion. but it's not "simple" diffusion which would be for example a dialysis bag where it's literally the membrane composition that enables diffusion. so, it's considered "facilitated" because the passive diffusion is facilitated by the conformation state of the TM protein.
active transport is used for a variety of things, one example is inducing a concentration gradient. If you want to generate a gradient, which is entropically unfavorable (obviously), it's going to require energy. Mitochondria work by using funky electron transfers to facilitate generation of a hydrogen ion gradient. This gradient is used to produce ATP by an ATP synthase. In a very abstract way it kinda resembles a water wheel.
i'm going to go take a shower because I feel disgusted by this amount of fucking spoonfeeding I just committed. fuck you
