The plasma membrane is mostly made of molecules that have hydrophilic heads and hydrophobic tails. these molecules are called

Lipid Bilayer.A plasma membrane is made up of Lipid Bilayers, which consists of polar phosphate heads, which are hydrophilic or water loving, and non-polar fatty acid tails, which are hydrophobic. Proteins are embedded in the membrane as well.Cell membranes are known to have holes, or selective permeable.

2hydrogen and 1 covalent

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