Cell Membrane and Transport

Front

What is the function of the cell membrane?

Back

The cell membrane controls the movement of substances in and out of the cell, providing protection and support.

Front

Define diffusion.

Back

Diffusion is the movement of molecules from an area of high concentration to an area of low concentration without the use of energy.

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the need for energy, typically following the concentration gradient.

Front

Explain active transport.

Back

Active transport is the movement of molecules against their concentration gradient, from low to high concentration, requiring energy.

Front

What is osmosis?

Back

Osmosis is 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 role do carrier proteins play in transport?

Back

Carrier proteins facilitate the movement of specific molecules across the cell membrane, often involved in passive transport.

Front

What is the concentration gradient?

Back

The concentration gradient is the difference in the concentration of a substance across a space, driving the movement of molecules.

Front

Define solute and solvent.

Back

A solute is a substance that is dissolved in a solvent, which is the substance that does the dissolving.

Front

What is endocytosis?

Back

Endocytosis is the process by which cells engulf substances from their external environment, bringing them into the cell.

Front

What is exocytosis?

Back

Exocytosis is the process by which cells expel materials in vesicles, releasing them into the external environment.