Diffusion

Which statement accurately describes the process of diffusion?

• Movement of a substance from an area of low concentration to high concentration, requiring energy.

• Net movement of a substance from an area of high concentration to low concentration.

• Movement of water across a semipermeable membrane.

• Active transport of molecules against their concentration gradient.

What is a key characteristic that classifies diffusion as a passive transport mechanism?

• It requires the use of ATP.

• It moves substances against their concentration gradient.

• It does not require an input of cellular energy.

• It only occurs across protein channels.

In facilitated diffusion, how do molecules move across the cell membrane?

• They move against their concentration gradient using ATP.

• They move directly across the lipid bilayer without assistance.

• They move from high to low concentration with the help of protein channels.

• They are engulfed by the cell through endocytosis.

How does an increase in temperature typically affect the rate of diffusion?

• It decreases the rate of diffusion by slowing molecular movement.

• It increases the rate of diffusion by increasing molecular kinetic energy.

• It has no significant effect on the rate of diffusion.

• It causes molecules to move against their concentration gradient.