Passive and Active Transport

Front

What is Passive Transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy by the cell. It relies on 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) to move molecules into or out of the cell.

Front

Define 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 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 Facilitated Diffusion?

Back

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

Front

What happens to a cell in a Hypotonic solution?

Back

In a hypotonic solution, water enters the cell, which can lead to cytolysis (bursting) due to increased internal pressure.

Front

What happens to a cell in a Hypertonic solution?

Back

In a hypertonic solution, water leaves the cell, causing it to shrink or crenate due to loss of water.

Front

What is an Isotonic solution?

Back

An isotonic solution has the same concentration of solutes as the cell, resulting in no net movement of water into or out of the cell.

Front

What is the role of transport proteins in Facilitated Diffusion?

Back

Transport proteins assist in the movement of larger or polar molecules across the cell membrane that cannot pass freely.

Front

What is Exocytosis?

Back

Exocytosis is the process by which a cell expels materials in vesicles that fuse with the cell membrane, releasing their contents outside the cell.