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what molecules can diffuse freely across the lipid bilayer?

romi656

wrote...

Posts: 6

Rep:

12 years ago

what molecules can diffuse freely across the lipid bilayer?

Hi, I wanted to know what molecules diffuse freely and which one cannot?
Thank you

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1 Reply

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bio_man

wrote...

#1

Educator

12 years ago

Gases and small, nonpolar molecules can diffuse freely across the lipid bilayer. Ions and large polar molecules require protein mechanisms to cross the cell membrane:

Passive transport proteins (no energy required)
Active transport proteins (require an energy expenditure)
Endocytosis and exocytosis (bulk movements by these two; endo in and exo out of cell)

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