Unit 4: Cell Membrane and Transport

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 an area of high concentration to an area of low concentration without the use of energy.

Front

What stops the movement of materials during diffusion?

Back

The movement of materials across the membrane during diffusion stops when there is a balance reached on both sides of the membrane.

Front

What is active transport?

Back

Active transport is the process of moving molecules across a cell membrane from an area of low concentration to an area of high concentration, requiring energy (ATP) to do so.

Front

Describe the direction of movement during diffusion.

Back

During diffusion, materials move from an area of high concentration to an area of low concentration.

Front

What is endocytosis?

Back

Endocytosis is a transport mechanism that allows whole cells or large particles to be brought into a cell by engulfing them in a vesicle.

Front

What is passive transport?

Back

Passive transport is the movement of molecules across a cell membrane without the use of energy, typically occurring along the concentration gradient.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

Front

What role do protein channels play in cell transport?

Back

Protein channels facilitate the movement of specific molecules across the cell membrane, aiding in processes like facilitated diffusion.

Front

What is the difference between active transport and passive transport?

Back

Active transport requires energy to move molecules against their concentration gradient, while passive transport does not require energy and moves molecules along their concentration gradient.

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.