Question

cell membrane exit ticket
protein channels are embedded in the membrane to help with transport of molecules that are ____________.
o too large to pass directly through the membrane
o charged (polar)
o both of these are true
o none of these are true

Explanation:

The cell - membrane is a lipid - bilayer. Large molecules and charged (polar) molecules cannot easily pass through the non - polar lipid bilayer. Protein channels provide a pathway for these molecules to cross the membrane.

Answer:

C. Both of these are true