Passive and Active Transport Practice

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy (ATP).

Front

What is passive transport?

Back

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

Front

What is diffusion?

Back

Diffusion is the process by which molecules spread from an area of high concentration to an area of low concentration.

Front

What is facilitated diffusion?

Back

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

Front

How does the concentration gradient affect diffusion?

Back

The rate of diffusion increases as the concentration gradient increases.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules through a selectively permeable membrane.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance between two areas.

Front

What role do transport proteins play in facilitated diffusion?

Back

Transport proteins assist in the movement of specific molecules across the cell membrane that cannot directly diffuse through the lipid bilayer.

Front

What is an example of a molecule that uses facilitated diffusion?

Back

Glucose is an example of a molecule that typically uses facilitated diffusion to cross the cell membrane.

Front

What is the difference between active and passive transport?

Back

Active transport requires energy to move substances against their concentration gradient, while passive transport does not require energy and moves substances along their concentration gradient.