Diffusion and Osmosis REVIEW

Front

What is the definition of passive transport?

Back

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

Front

What is the definition of active transport?

Back

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

Front

What is an isotonic solution?

Back

An isotonic solution is a solution that has the same concentration of solutes as the inside of a cell, resulting in no net movement of water.

Front

What is a hypertonic solution?

Back

A hypertonic solution is a solution that has a higher concentration of solutes compared to the inside of a cell, causing water to move out of the cell.

Front

What is a hypotonic solution?

Back

A hypotonic solution is a solution that has a lower concentration of solutes compared to the inside of a cell, causing water to move into the cell.

Front

What is osmosis?

Back

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

Front

What is diffusion?

Back

Diffusion is the process by which molecules spread from areas of high concentration to areas of low concentration until equilibrium is reached.

Front

What is the role of a selectively permeable membrane?

Back

A selectively permeable membrane allows certain molecules to pass through while blocking others, thus regulating the movement of substances in and out of the cell.

Front

What is endocytosis?

Back

Endocytosis is the process by which cells take in materials by engulfing them with the cell membrane, forming a vesicle.

Front

What is exocytosis?

Back

Exocytosis is the process by which cells expel materials by vesicles fusing with the cell membrane and releasing their contents outside the cell.