Unit 4: Cell Membrane and Transport

Front

What is osmosis?

Back

Osmosis is the movement 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 plant cell in a hypertonic solution?

Back

In a hypertonic solution, a plant cell loses water, causing it to wilt.

Front

Define selectively permeable membrane.

Back

A selectively permeable membrane is one that allows certain substances to pass through while blocking others.

Front

What is diffusion?

Back

Diffusion is the process by which particles move from an area of high concentration to an area of low concentration.

Front

What role do transmembrane proteins play in a cell membrane?

Back

Transmembrane proteins help the cell interact with its external environment and facilitate the transport of substances across the membrane.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance across a space.

Front

Explain facilitated diffusion.

Back

Facilitated diffusion is the process of passive transport of molecules across a cell membrane via specific transmembrane proteins.

Front

What is homeostasis?

Back

Homeostasis is the process by which living organisms maintain a stable internal environment despite changes in external conditions.

Front

What is the difference between active transport and passive transport?

Back

Active transport requires energy to move substances against their concentration gradient, while passive transport does not require energy and moves substances along their concentration gradient.

Front

What is the function of channel proteins?

Back

Channel proteins facilitate the transport of specific substances across a cell membrane by providing a passageway.