Cell Transport

Front

What is facilitated diffusion?

Back

A type of passive transport that uses protein channels to help molecules cross the cell membrane without using energy.

Front

What is active transport?

Back

A process that requires energy to move molecules against their concentration gradient, from an area of lower concentration to an area of higher concentration.

Front

What is the primary structure of the cell membrane?

Back

The cell membrane is primarily made of a phospholipid bilayer, which consists of two layers of phospholipids.

Front

What is osmosis?

Back

The diffusion of water across a selectively permeable membrane.

Front

What is endocytosis?

Back

A process by which cells take in substances by engulfing them in a membrane, often used by amoebas to take in food.

Front

What is exocytosis?

Back

The process by which a cell expels materials in vesicles that fuse with the cell membrane.

Front

What is passive transport?

Back

The movement of molecules across the cell membrane without the use of energy, following the concentration gradient.

Front

What is a concentration gradient?

Back

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

Front

What role do protein channels play in cell transport?

Back

Protein channels facilitate the movement of specific molecules across the cell membrane during facilitated diffusion.

Front

What is the difference between simple diffusion and facilitated diffusion?

Back

Simple diffusion is the movement of small or nonpolar molecules directly through the lipid bilayer, while facilitated diffusion requires protein channels for larger or polar molecules.