Quiz on Passive Transport - Simple Diffusion

What is the main characteristic of passive transport?

• It requires energy to move molecules.

• It moves molecules from low to high concentration.

• It involves the movement of molecules across cell membranes without energy.

• It only occurs in plant cells.

How does oxygen enter cells through simple diffusion?

• By being actively transported by proteins.

• By using cellular energy to cross the membrane.

• By moving from an area of low concentration to high concentration.

• By quickly crossing the phospholipid bilayer when its concentration is high outside the cell.

What is net diffusion?

• The process of molecules staying in one place.

• The movement of water only.

• The total movement of materials from one side to another, down the concentration gradient.

• The movement of molecules from low to high concentration.

What happens to molecules during net diffusion?

• They move randomly and may collide with each other or the membrane.

• They require energy to move.

• They stop moving once equilibrium is reached.

• They only move in one direction.

What is the result of net diffusion over time?

• The number of particles on each side becomes unequal.

• Molecules stop moving completely.

• Equilibrium is reached, with equal particles on both sides.

• The concentration gradient becomes steeper.