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A phosphoglycerate is always made up of:

1. only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
2. a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
3. a saturated or unsaturated fatty acid esterified to a phosphate group which is also attached to a glycerol molecule
4. only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached

Correct answer: a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached

Solution

Phosphoglycerates (phosphoglycerides) have a glycerol backbone with a phosphate group and fatty acid chains attached by ester bonds. Those fatty acids may be saturated or unsaturated, so the correct choice includes both possibilities.

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