Cell Transport Practice

Front

What is diffusion?

Back

Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration until equilibrium is reached.

Front

What is passive transport?

Back

Passive transport is the movement of molecules across a cell membrane without the use of energy, typically moving from high to low concentration.

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane using energy, usually moving from low to high concentration.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules through a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process by which molecules that cannot directly diffuse through the membrane pass through special protein channels.

Front

How do molecules move in passive transport?

Back

Molecules move from areas of high concentration to areas of low concentration.

Front

Does active transport require energy?

Back

Yes, active transport requires energy to move molecules against their concentration gradient.

Front

What is the difference between diffusion and facilitated diffusion?

Back

Diffusion occurs directly through the membrane, while facilitated diffusion requires specific transport proteins to help molecules cross the membrane.

Front

What role do protein channels play in facilitated diffusion?

Back

Protein channels provide a pathway for specific molecules to pass through the cell membrane more easily.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in concentration of a substance across a space, which drives the movement of molecules.