Question

facilitated diffusion is a process that occurs in plant and animal cells. as the name presumes, facilitated diffusion is a form of diffusion, but slightly different. this means that facilitated diffusion does not require any energy from the cell because it is still moving particles from an area of high concentration outside the cell to an area of low concentration inside the cell.
if a desired molecule is too large or charged, instead of it moving through a cells membrane, protein channels which are embedded into a cells membrane allow the molecule to pass through the protein channels
there are hundreds of different protein channels for different molecules
please refer to the passage to help you answer this problem. why doesnt facilitated diffusion require energy from the cell?
the protein channels provide the energy required.
the movement is from a high concentration to a lower concentration
facilitated diffusion does require energy.

Explanation:

To answer why facilitated diffusion doesn't need energy from the cell, we refer to the passage. The passage says facilitated diffusion is a form of diffusion (so it follows the diffusion principle) and it moves particles from an area of high concentration to low concentration. Let's analyze each option:

• Option 1: The passage doesn't say protein channels provide energy. Protein channels just allow molecules to pass, so this is incorrect.
• Option 2: Since diffusion (including facilitated diffusion) moves substances down their concentration gradient (high to low), this process doesn't need the cell to provide energy. This matches the passage's description.
• Option 3: The passage clearly states facilitated diffusion does not require energy, so this is wrong.

Answer:

The movement is from a high concentration to a lower concentration