Phospholipids differ from triacylglycerols because they contain:
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Correct answer: A phosphate group
Phospholipids replace one fatty acid of a triacylglycerol with a phosphate group linked to a polar head group (e.g., choline, ethanolamine, serine). This imparts an amphipathic character essential for bilayer formation, distinguishing them structurally and functionally from neutral triacylglycerols.
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