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The phosphoglycerides in cell membrane are of the _________ type.

(a) Triglyceride

(b) Diglyceride

(c) Monoglyceride

(d) Polyglyceride

This question was addressed to me in an internship interview.

This intriguing question comes from Chemical Composition of Membranes topic in chapter Cellular Membranes of Cell Biology

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The correct option is (b) Diglyceride

To elaborate: Membrane glycerides, which contain a phosphate group has two fatty acids. Therefore, they are phosphor-diglycerides. Only two of the hydroxyl groups of the glycerol are esterified to a hydrophilic phosphate group.

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