Cell Membrane, Passive Transport, and Active Transport notes

Front

What is the definition of a cell membrane?

Back

The cell membrane is the boundary between the cell and its environment.

Tags

NGSS.MS-LS1-2

Front

What role do proteins play in the cell membrane?

Back

Proteins facilitate (help) the molecules through the plasma membrane.

Front

What is passive transport?

Back

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

Front

What is active transport?

Back

Active transport is the movement of molecules against the concentration gradient, requiring energy (ATP) to move substances into or out of the cell.

Front

What is the function of cholesterol in the cell membrane?

Back

Cholesterol helps to stabilize the cell membrane's fluidity and structure.

Front

What are the two main types of transport across the cell membrane?

Back

Passive transport and active transport.

Tags

NGSS.HS-LS2-3

Front

What is osmosis?

Back

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

Front

What is the difference between diffusion and facilitated diffusion?

Back

Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration, while facilitated diffusion uses transport proteins to help move molecules across the membrane.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance across a space.

Front

What is endocytosis?

Back

Endocytosis is the process by which cells take in substances by engulfing them in a vesicle.