Cell Transport and Membranes

Front

What is osmosis?

Back

Osmosis is the diffusion of water across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What role does cholesterol play in the cell membrane?

Back

Cholesterol strengthens and stabilizes the cell membrane, making it less permeable to very small water-soluble molecules that might otherwise pass freely through.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses special proteins to help move particles across the cell membrane without the use of energy.

Front

Name two types of passive transport.

Back

Osmosis and diffusion are two types of passive transport.

Front

What does the Fluid Mosaic Model describe?

Back

The Fluid Mosaic Model describes the cell membrane as a flexible structure made up of various components, including phospholipids, proteins, and cholesterol, allowing for movement and interaction.

Front

What is diffusion?

Back

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

Front

What is the difference between passive and active transport?

Back

Passive transport does not require energy to move substances across the cell membrane, while active transport requires energy to move substances against their concentration gradient.

Front

What is a selectively permeable membrane?

Back

A selectively permeable membrane allows certain molecules to pass through while blocking others, maintaining the internal environment of the cell.

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 from the cell, often using vesicles to transport substances to the cell membrane.