Question

Select all the substances that require facilitated diffusion to cross a membrane. (you can select multiple)
A. negativity charged ions
B. hydrophilic molecules
C. molecules with no charge
D. hydrophilic molecules​

Answer 1

A: Negatively charged ions

B: Hydrophollic molecules

Answer 2

Facilitated diffusion is the spontaneous passive transport of molecules across the biological membrane through the help of a membrane protein. This type of diffusion occurs in the molecules that cannot cross the membrane freely and requires a molecule to enter and leave the membrane.

Negatively charged ions and hydrophobic molecules require facilitated diffusion.

What occurs in facilitated diffusion?

• Channel and carrier proteins are needed for the facilitated diffusion because the molecules are not self-sufficient to cross the membrane on their own.

• Charged, polar ions and water-fearing molecules are transported with the help of certain protein channels and carriers that facilitates the molecules from the varied concentration environment.

Therefore, option A and B are correct.

Learn more about facilitated diffusion here:

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