AP Bio Insta-Review Topic 2.7*: Facilitated Diffusion

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a process by which substances move across a cell membrane with the help of transport proteins, without the use of energy (ATP).

Front

What is required for facilitated diffusion to occur?

Back

Facilitated diffusion requires membrane proteins to assist in the transport of molecules across the membrane.

Front

How do channel proteins function in facilitated diffusion?

Back

Channel proteins provide a passageway for specific molecules, such as ions or water, to move across the membrane down their concentration gradient.

Front

What type of molecules typically use facilitated diffusion?

Back

Polar molecules and ions, which cannot easily pass through the lipid bilayer, typically use facilitated diffusion.

Front

What is the role of carrier proteins in facilitated diffusion?

Back

Carrier proteins bind to specific molecules and change shape to transport them across the membrane.

Front

What is the difference between simple diffusion and facilitated diffusion?

Back

Simple diffusion occurs directly through the membrane without assistance, while facilitated diffusion requires transport proteins.

Front

Why are charged molecules considered hydrophilic?

Back

Charged molecules are hydrophilic because they interact well with water, allowing them to dissolve and move in aqueous environments.

Front

Are transport proteins specific for the materials they transport?

Back

Yes, transport proteins are specific and only facilitate the movement of certain molecules or ions.

Front

What is the significance of a concentration gradient in facilitated diffusion?

Back

A concentration gradient is essential for facilitated diffusion as it drives the movement of molecules from an area of higher concentration to an area of lower concentration.

Front

What happens to a cell in a hypotonic solution?

Back

In a hypotonic solution, water enters the cell, potentially causing it to swell and burst due to increased internal pressure.