Question

instructions: answer the questions below about passive transport and active transport. 1) which process uses protein channels to move molecules across a membrane? 2) which process uses protein pumps to move molecules across a membrane? 3) both facilitated diffusion and active transport use proteins to move molecules. despite this similarity, what is the difference between the two processes?

Explanation:

1. Passive transport using protein channels is facilitated diffusion, which moves molecules along their concentration gradient (from high - to low - concentration) without energy input.
2. Active transport uses protein pumps to move molecules against their concentration gradient (from low - to high - concentration), requiring energy (usually ATP).
3. The key difference is that diffusion (including facilitated diffusion) is a passive process driven by concentration gradients, while active transport is an energy - consuming process that can move molecules against their natural gradient.

Answer:

1. Facilitated diffusion
2. Active transport
3. Diffusion is passive, active transport requires energy.