CHECKPOINT: Cell Transport

Front

What biomolecule makes up MOST of the cell membrane?

Back

Phospholipids

Front

How does the cell membrane help maintain homeostasis in each cell?

Back

The cell membrane controls the movement of substances in and out of the cell.

Front

What is passive transport?

Back

Passive transport is the movement of molecules across the cell membrane without the use of energy, typically from an area of high concentration to an area of low concentration.

Front

What is active transport?

Back

Active transport is the movement of molecules across the cell membrane using energy, typically from an area of low concentration to an area of high concentration.

Front

What is facilitated diffusion?

Back

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

Front

What role do proteins play in cell transport?

Back

Proteins can act as channels or pumps to help move substances across the cell membrane.

Front

What is the lipid bilayer?

Back

The lipid bilayer is a double layer of phospholipids that makes up the cell membrane, providing a barrier to most water-soluble substances.

Front

What is endocytosis?

Back

Endocytosis is the process by which cells take in large molecules or particles by engulfing them in a membrane vesicle.

Front

What is exocytosis?

Back

Exocytosis is the process by which cells expel large molecules or particles by fusing a vesicle with the cell membrane.

Front

What is the difference between diffusion and osmosis?

Back

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