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two molecules that can cross a lipid bilayer without help from membrane proteins are O2 and CO2, what property allows this to occur

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ctshealey

O2 and CO2 are both nonpolar molecules that can easily pass through the hydrophobic interior of a membrane! Hope it helps

Manetho

both the molecules are too small and have no charge therefore they can move across a membrane via gradient pressure from higher concentration to lower via simple diffusion. they don't need any atp or energy.

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