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Phospholipids are derivatives of glycerol in which two of the hydroxyl groups are esterified with fatty acids while the third is esterified with some derivative of phosphoric acid with some alcohol such as choline, ethanolamine, serine or inositol.

1. Triglycerides
2. Phospholipids
3. Steroids
4. Waxes

Correct answer: Phospholipids

Solution

Phospholipids are molecules where glycerol is esterified with two fatty acids and a phosphate group linked to an alcohol like choline or ethanolamine, matching the description in the question.

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