Cell transport

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that allows molecules to cross membranes with the assistance of special proteins. It occurs from an area of high concentration to low concentration.

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from an area of lower concentration to an area of higher concentration, requiring energy.

Front

What does it mean to move against the concentration gradient?

Back

To move against the concentration gradient means to move from an area of lower concentration to an area of higher concentration, which requires energy.

Front

What is passive transport?

Back

Passive transport is the movement of molecules across a cell membrane without the use of energy, occurring from an area of high concentration to low concentration.

Front

What is endocytosis?

Back

Endocytosis is a process by which cells take in substances by engulfing them in a vesicle made from the plasma membrane.

Front

What is exocytosis?

Back

Exocytosis is the process by which cells expel materials in vesicles that fuse with the plasma membrane, releasing their contents outside the cell.

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 is the role of transport proteins?

Back

Transport proteins facilitate the movement of substances across a cell membrane, either by providing a passageway for molecules or by actively transporting them.

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 transport proteins to help larger or polar molecules cross the membrane.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance between two areas, which drives the movement of molecules during diffusion.