Question

How is active transport different than simple diffusion and facilitated diffusion?

Answer 1

Active transport is different from simple diffusion and facilitated diffusion in terms of direction, energy requirement, and involvement of transport proteins.

Step-by-step explanation:

Active transport is different from simple diffusion and facilitated diffusion in several ways:

1. Direction: Active transport moves molecules from an area of low concentration to an area of high concentration, while simple diffusion and facilitated diffusion move molecules from an area of high concentration to an area of low concentration.
2. Energy Requirement: Active transport requires the input of energy, usually in the form of ATP, to move molecules against their concentration gradient. Simple diffusion and facilitated diffusion do not require energy.
3. Transport Proteins: Active transport involves the use of specific transport proteins that bind to and transport molecules across the membrane. Simple diffusion and facilitated diffusion may also involve transport proteins, but they mainly rely on the physical properties of the molecules (such as size and charge) to cross the membrane.