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Which of the following is exoplasmic?(a) Phosphatidyl choline(b) Phosphatidyl serine(c) Phosphatidyl ethanolamine(d) Phosphatidyl inositolI have been asked this question in quiz.Question is taken from Chemical Composition of Membranes topic in portion Cellular Membranes of Cell Biology

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The correct ANSWER is (a) PHOSPHATIDYL choline

For explanation I would say: The phospholipids of cell membrane are composed of phosphatidyl choline (PC), phosphatidyl serine (PS), phosphatidyl ethanolamine (PE) and phosphatidyl inositol (PI). PC is exoplasmic and present towards the extracellular FLUID. PS, PE and Pi are CYTOSOLIC and located towards the cytoplasm.



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