Question

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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. oxygen, a small nonpolar molecule glucose, a large polar molecule sodium ion, a charged molecule water, a very small polar molecule

Explanation:

The text states that small non - polar molecules can cross the lipid bilayer without assistance, and very small polar molecules like water can pass through slowly without assistance. Large polar molecules and ions cannot cross without assistance. Oxygen is a small non - polar molecule and water is a very small polar molecule that can pass through without assistance. Glucose is a large polar molecule and sodium ion is a charged molecule that cannot pass through without assistance.

Answer:

A. oxygen, a small nonpolar molecule
D. water, a very small polar molecule