AP Biology Cell Transport

Front

What is cell transport?

Back

Cell transport refers to the movement of substances across the cell membrane, which can occur through passive or active mechanisms.

Front

Define passive transport.

Back

Passive transport is the movement of molecules across a cell membrane without the use of energy, relying on concentration gradients.

Front

What is active transport?

Back

Active transport is the movement of molecules against their concentration gradient, requiring energy (usually in the form of ATP).

Front

What is osmosis?

Back

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

Front

What happens to a cell in a hypertonic solution?

Back

In a hypertonic solution, a cell will lose water and shrink due to the higher concentration of solutes outside the cell.

Front

What is a selectively permeable membrane?

Back

A selectively permeable membrane allows certain molecules to pass through while blocking others, maintaining the cell's internal environment.

Front

What role do transport proteins play in cell transport?

Back

Transport proteins facilitate the movement of large or charged molecules across the cell membrane that cannot diffuse freely.

Front

What is diffusion?

Back

Diffusion is the passive movement of molecules from an area of higher concentration to an area of lower concentration until equilibrium is reached.

Front

What is the difference between facilitated diffusion and simple diffusion?

Back

Facilitated diffusion requires specific transport proteins to help move molecules across the membrane, while simple diffusion does not.

Front

What is endocytosis?

Back

Endocytosis is the process by which cells engulf substances from the outside environment, forming a vesicle to bring them into the cell.