Active Transport:
* Requires energy: Carrier proteins use energy, usually from ATP, to move molecules against their concentration gradient (from low to high concentration).
* Specificity: Carrier proteins are highly specific and only bind to certain molecules.
* Examples: Sodium-potassium pump, glucose transport in the intestines.
Passive Transport:
* No energy required: Carrier proteins facilitate the movement of molecules down their concentration gradient (from high to low concentration). This movement doesn't require energy.
* Specificity: Similar to active transport, carrier proteins are specific to the molecules they bind.
* Examples: Facilitated diffusion of glucose into red blood cells.
In summary:
* Active transport: Carrier proteins use energy to move molecules against their concentration gradient.
* Passive transport: Carrier proteins help molecules move down their concentration gradient without using energy.
It's important to note that the type of transport (active or passive) depends on the specific carrier protein and the context of its function.
