Active and Passive Transport

Front

What is active transport?

Back

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

Front

What is passive transport?

Back

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

Front

Define endocytosis.

Back

Endocytosis is the process by which cells take in materials by engulfing them in a vesicle.

Front

Define exocytosis.

Back

Exocytosis is the process by which cells expel materials in vesicles that fuse with the cell membrane.

Front

What is osmosis?

Back

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

Front

What does permeable mean?

Back

Permeable means that a membrane allows certain substances to pass through it.

Front

What is diffusion?

Back

Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration until equilibrium is reached.

Front

What is facilitated diffusion?

Back

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

Front

What are protein pumps?

Back

Protein pumps are membrane proteins that actively transport ions or molecules across a cell membrane against their concentration gradient.

Front

What is an isotonic solution?

Back

An isotonic solution is one where the concentration of solutes is equal inside and outside the cell, resulting in no net movement of water.