Unit 4 Vocab: Cell Transport

Front

What is diffusion?

Back

Diffusion is a process in which particles tend to move from an area where they are more concentrated to an area where they are less concentrated.

Front

Define cell membrane.

Back

A cell membrane is a thin flexible barrier that encloses the cell, controlling the passage of substances in and out.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process in which a molecule passes across the membrane through cell membrane channels.

Front

What is passive transport?

Back

Passive transport is the movement across the cell membrane that does not require energy.

Front

What is a receptor protein?

Back

A receptor protein is a protein on the cell membrane that receives a signal molecule.

Front

What is osmosis?

Back

Osmosis is the diffusion of water across a selectively permeable membrane.

Front

What is active transport?

Back

Active transport is the movement of substances across a cell membrane against their concentration gradient, requiring energy.

Front

What role do transport proteins play in cell transport?

Back

Transport proteins assist in the movement of substances across the cell membrane, either passively or actively.

Front

What is the difference between passive and active transport?

Back

Passive transport does not require energy and moves substances down their concentration gradient, while active transport requires energy to move substances against their concentration gradient.

Front

What is endocytosis?

Back

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