STAAR Biology Cellular Processes

Front

What is osmosis?

Back

Osmosis is the process by which water molecules move across a cell membrane from an area of high concentration to an area of low concentration.

Front

What is the primary function of osmosis in plant cells?

Back

Osmosis allows water to enter plant cells, helping to maintain turgor pressure and support the plant structure.

Front

What type of cellular transport does not require energy?

Back

Passive transport, which includes osmosis and diffusion, does not require energy.

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from an area of low concentration to an area of high concentration, requiring energy.

Front

What energy molecule is used in active transport?

Back

ATP (adenosine triphosphate) is the energy molecule used in active transport.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process by which molecules move across a cell membrane through protein channels, without the use of energy.

Front

How does dialysis work?

Back

Dialysis is a type of diffusion that uses an ion-exchange membrane separation process, driven by a concentration gradient, to clean the blood.

Front

What is the difference between osmosis and diffusion?

Back

Osmosis specifically refers to the movement of water molecules, while diffusion refers to the movement of any type of molecules from high to low concentration.

Front

What role do channel proteins play in facilitated diffusion?

Back

Channel proteins help specific molecules move across the cell membrane depending on their charge and size.

Front

What is a concentration gradient?

Back

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