how is hydrophobic important for the functioning of the membrane?

Question

Im doing a biology assignment and are stuck on this question

Answer 1

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Answer 2

First, the lipids that make up the membrane are held together by hydrophobic interactions.

Second, because most of the molecules that cells use are hydrophilic and soluble in water, the hydrophobic part of the membrane is a barrier to their spontaneous movement into or out of the cell.