Question

this arrangement prevents certain molecules from crossing the lipid bilayer on their own. the phospholipids are tightly packed, which means large molecules cannot fit between them. small nonpolar molecules can cross, but ions and most polar molecules cannot cross because they are repelled by the nonpolar fatty acid tails. some very small polar molecules, like water, are able to pass through, but they do so at a slow rate. which of the following molecules can pass through the lipid bilayer without assistance? select all that apply. glucose, a large polar molecule sodium ion, a charged molecule water, a very small polar molecule oxygen, a small nonpolar molecule

Explanation:

According to the text, large molecules (like glucose) cannot pass as phospholipids are tightly packed. Ions (sodium ion) and most polar molecules are repelled. Small non - polar molecules (oxygen) can cross. Some very small polar molecules (water) can pass slowly without assistance.

Answer:

water, a very small polar molecule; oxygen, a small nonpolar molecule