What Types of Molecules May NOT Need Transport Proteins to Be

Question

What types of molecules may NOT need transport proteins to be able to cross cytoplasmic membranes?
A) large molecules
B) ions
C) small hydrophobic molecules
D) small hydrophilic molecules
E) nothing crosses cytoplasmic membranes without transport proteins

Accepted Answer

Small hydrophobic molecules can pass through cytoplasmic membranes without the need for transport proteins due to their ability to dissolve in the lipid bilayer.