Cell Transport

Front

What is active transport?

Back

Active transport is the process of moving molecules across a cell membrane from an area of lower concentration to an area of higher concentration, using energy in the form of ATP.

Front

What is passive transport?

Back

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

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses carrier proteins to help move molecules across the cell membrane down their concentration gradient.

Front

What does semi-permeable mean?

Back

A semi-permeable membrane allows certain substances to pass through while blocking others, such as the cell membrane allowing water, oxygen, and carbon dioxide to pass.

Front

What is diffusion?

Back

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

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules through a semi-permeable membrane from an area of low solute concentration to an area of high solute concentration.

Front

What is the concentration gradient?

Back

The concentration gradient is the difference in the concentration of a substance across a space, which drives the movement of molecules during diffusion.

Front

What role does ATP play in active transport?

Back

ATP provides the energy required for active transport to move molecules against their concentration gradient.

Front

What is the difference between simple diffusion and facilitated diffusion?

Back

Simple diffusion occurs directly through the membrane without assistance, while facilitated diffusion requires specific carrier proteins to help transport molecules.

Front

What is a carrier protein?

Back

A carrier protein is a type of membrane protein that transports specific substances across the cell membrane by changing shape.