Question

multiple choice question
phospholipids in membranes associate with ______ toward the water side.

tails
both heads and tails (i.e., they lay flat, \side - ways\)
heads
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Explanation:

Phospholipids have hydrophilic (water-attracting) heads and hydrophobic (water-repelling) tails. In membranes, they form a bilayer where the hydrophilic heads face the aqueous (water) environment, while the hydrophobic tails are oriented inward, away from water.

Answer:

heads