Cell Membrane and Cell Transport Flashcard

Front

What is diffusion?

Back

Diffusion is the movement of molecules from an area of high concentration to an area of low concentration until equilibrium is reached.

Front

What is osmosis?

Back

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

Front

What is the main function of the cell membrane?

Back

The main function of the cell membrane is to control the movement of substances in and out of the cell.

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, relying on concentration gradients.

Front

What is active transport?

Back

Active transport is the movement of substances against their concentration gradient, requiring energy (ATP) to occur.

Front

What is the difference between diffusion and osmosis?

Back

Diffusion refers to the movement of any molecules, while osmosis specifically refers to the movement of water molecules.

Front

What does it mean for a solution to be isotonic?

Back

An isotonic solution has the same concentration of solutes as another solution, resulting in no net movement of water.

Front

Why is diffusion important for cells?

Back

Diffusion allows cells to take in necessary materials and expel waste without using energy.

Front

What is a selectively permeable membrane?

Back

A selectively permeable membrane allows certain substances to pass through while blocking others.

Front

What is the role of transport proteins in cell membranes?

Back

Transport proteins help move substances across the cell membrane, either passively or actively.