Question

Which types of molecules are able to diffuse across the cell membrane?

water molecules

small molecules

very large molecules

fat-soluble molecules

Answer 1

Which types of molecules are able to diffuse across the cell membrane?

water molecules (Yes)

small molecules (Yes)

very large molecules (No)

fat-soluble molecules (Yes)

Answer 2

small molecules

Step-by-step explanation:

Small nonpolar molecules, such as O2 and CO2, are soluble in the lipid bilayer and therefore can readily cross cell membranes.

Small uncharged polar molecules, such as H2O, also can diffuse through membranes.