Describe the composition and role of biological membranes.

Biological membranes are essential components of living cells that define cell boundaries and compartmentalize cellular processes. The basic structure of biological membranes is the phospholipid bilayer, which consists of hydrophilic (water-attracting) heads and hydrophobic (water-repelling) tails. The hydrophilic heads face __________ ________ ________ _______ _________ _________ _____ _______.
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