Active and Passive Transport Review

Front

What is Active Transport?

Back

The movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy.

Front

What is Passive Transport?

Back

The movement of molecules across a cell membrane without the use of energy, typically from an area of high concentration to an area of low concentration.

Front

Define Diffusion.

Back

The process by which molecules spread from areas of high concentration to areas of low concentration until equilibrium is reached.

Front

What is Osmosis?

Back

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 does it mean for a solution to be isotonic?

Back

A solution that has the same concentration of solutes as another solution, resulting in no net movement of water.

Front

What is a concentration gradient?

Back

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

Front

What is Exocytosis?

Back

The process by which a cell expels materials in vesicles that fuse with the cell membrane.

Front

What is Endocytosis?

Back

The process by which a cell takes in materials by engulfing them in a vesicle.

Front

Define Equilibrium in the context of diffusion.

Back

A state where the concentrations of a substance are equal in two areas, resulting in no net movement of molecules.

Front

What is facilitated diffusion?

Back

A type of passive transport that uses transport proteins to help move molecules across the cell membrane.