Question

what kind of substance cant permeate membranes by passive diffusion?​

Answer 1

Because of the nature of a phospholipid (a polar head with nonpolar tails), both non-ionized and hydrophobic molecules can move passively across a membrane. However, hydrophilic (i.e. polar or charged molecules) are unable to passively diffuse across a membrane.

Answer 2

Answer and Explanation:

Because of the nature of a phospholipid (a polar head with nonpolar tails), both non-ionized and hydrophobic molecules can move passively across a membrane. However, hydrophilic (i.e. polar or charged molecules) are unable to passively diffuse across a membrane.