How are ions and small polar molecules such as glucose able to move across plasma membranes? A) osmosis
B) endocytosis
C) using a transport protein
D) through gaps in the phospholipid bilayer

Answer is C

Explanation:

Although ions and most polar molecules cannot diffuse across a lipid bilayer, many such molecules (such as glucose) are able to cross cell membranes. These molecules pass across membranes via the action of specific transmembrane proteins, which act as transporters.

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