UA 02 - Cell Transport

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy (ATP).

Front

What is passive transport?

Back

Passive transport is the movement of molecules across a cell membrane without the use of energy, moving from an area of higher concentration to an area of lower concentration.

Front

Define osmosis.

Back

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

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses protein channels to help move molecules across the cell membrane from high to low concentration.

Front

What is endocytosis?

Back

Endocytosis is the process by which a cell takes in materials by engulfing them in a membrane, forming a vesicle.

Front

What is exocytosis?

Back

Exocytosis is the process by which a cell expels materials by vesicles fusing with the cell membrane and releasing their contents outside the cell.

Front

What is the difference between diffusion and osmosis?

Back

Diffusion refers to the movement of any molecules from high to low concentration, while osmosis specifically refers to the movement of water.

Front

What are protein pumps?

Back

Protein pumps are membrane proteins that use energy to transport ions or molecules against their concentration gradient.

Front

What is concentration gradient?

Back

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

Front

What is a selectively permeable membrane?

Back

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