Facilitated diffusion and active transport both a. require...

Facilitated diffusion and active transport both
$a$. require ATP.
$b$. require the use of proteins as carriers or channels.
c. carry solutes in only one direction.
$d$. increase without limit as the concentration gradient increases.
e. depend on the solubility of the solute in lipids.

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Membrane Transport Proteins

Membrane transport proteins play a critical role in both facilitated diffusion and active transport by providing selective pathways for solutes to cross the hydrophobic cell membrane. These proteins include channels and carriers that ensure solutes are transported in a controlled and efficient manner, maintaining proper cellular function and homeostasis across varying environmental conditions.

Facilitated Diffusion

Facilitated diffusion is a type of passive transport in which molecules move across the cell membrane down their concentration gradient with the help of specific membrane proteins, such as carrier proteins or ion channels. Unlike simple diffusion, it is a regulated process that involves binding of the solute to the protein, allowing movement without the direct expenditure of cellular energy.

Active Transport

Active transport is a cellular process in which substances are moved across the cell membrane against their concentration gradient. This movement requires energy input, typically in the form of ATP, and is performed by specialized transport proteins that change conformation to move the solute across the membrane, ensuring that essential molecules can be accumulated or expelled as necessary.

Transcript

Please give Ace some feedback