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 the sodium-potassium pump?

Back

An example of active transport that moves sodium ions out of the cell and potassium ions into the cell against their concentration gradients.

Front

What is exocytosis?

Back

The process by which large molecules exit a cell, involving the fusion of vesicles with the cell membrane.

Front

What is osmosis?

Back

The diffusion of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

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 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.

Front

What is endocytosis?

Back

The process by which cells take in large molecules or particles by engulfing them in a vesicle.