Cell Membrane & Cell Transport

Front

What is osmosis?

Back

Osmosis is the movement of water across a membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What does it mean for a membrane to be selectively permeable?

Back

A selectively permeable membrane allows some molecules to cross while preventing others from doing so.

Front

What is the primary function of the cell membrane?

Back

The cell membrane controls the passage of materials in and out of the cell.

Front

Which particles can diffuse through the phospholipid bilayer without protein channels?

Back

Oxygen and carbon dioxide can diffuse through the phospholipid bilayer without using protein channels.

Front

What is endocytosis?

Back

Endocytosis is the process by which a cell engulfs material from its environment, such as bacteria, by wrapping it in a portion of its cell membrane.

Front

What is the structure of the cell membrane?

Back

The cell membrane is composed of a phospholipid bilayer with embedded proteins, cholesterol, and carbohydrates.

Front

What is passive transport?

Back

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

Front

What is active transport?

Back

Active transport is the movement of substances against their concentration gradient, requiring energy (usually in the form of ATP).

Front

What role do protein channels play in cell transport?

Back

Protein channels facilitate the movement of specific molecules across the cell membrane that cannot diffuse freely.

Front

What is the fluid mosaic model?

Back

The fluid mosaic model describes the cell membrane as a flexible layer made of lipid molecules with proteins embedded, allowing for movement and fluidity.