passive and active transport

Front

What is passive transport?

Back

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

Front

What is active transport?

Back

The movement of substances across a cell membrane against a concentration gradient, requiring energy in the form of ATP.

Front

Define concentration gradient.

Back

A difference in the concentration of a substance across a space or membrane.

Front

What is osmosis?

Back

The diffusion of water across a selectively permeable membrane, moving from an area of low solute concentration to an area of high solute concentration.

Front

What is facilitated diffusion?

Back

A type of passive transport that uses transport proteins to help move substances across a cell membrane.

Front

What is endocytosis?

Back

The process by which a cell engulfs material from its environment, bringing it into the cell.

Front

What is exocytosis?

Back

The process by which a cell expels materials to the outside environment.

Front

What role do transport proteins play in active transport?

Back

Transport proteins help move substances across the cell membrane against their concentration gradient, often using ATP.

Front

What is the difference between simple diffusion and facilitated diffusion?

Back

Simple diffusion occurs directly through the membrane, while facilitated diffusion requires specific transport proteins.

Front

What is the purpose of active transport?

Back

To move substances against their concentration gradient, allowing cells to maintain necessary concentrations of ions and molecules.