Question

10. Rank the following in the order of increasing solubility in water a triacylglycerol, a diacylglycerol, and a monoacylglycerol, all containing palmitic acid. 11. A mixture of lipid is applied to a silica gel column and then the column is washed with increasingly polar solvents. The mixture contains palmitate, phosphotidylserine, cholesterol, and phosphotidyl ethanolamine. Predict the order of lipids eluted from the column. Explain. 12. Can a pure sample of cholesterol form an artificial bilayer when mixed with water? A) Yes, as cholesterol is weakly amphiphilic. B) Yes, as cholesterol is amphipathic and has the correct shape for close packing C) No, as cholesterol is almost entirely hydrophobic. 13. Why are glycerophospholipids capable of spontaneously assembling into the bilayer structure found in biological membranes but triacylglycerols are not? A) Glycerophospholipids are amphipathic and aggregate into bilayers that can interact with water on both faces. B) Triacylglycerols have three acyl chains that do not align easily side-by-side to form a bilayer C) Triacylglycerols are not amphiphilic. D) Both A and B are true. E) All of the above are true. 14. Which of the following correctly identifies the fatty acid shown? A) 18:1(D) B) 18:1(D ) C) 16:1(D) D) 16:1(D ) 15. Why do hydropathy plots not detect trans-membrane b-strands? A) The strands are too short. B) They may not be exclusively hydrophobic. C) They can form intermolecular interactions. D) Both A and B. E) Both B and C.

Answer 1

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- As the water solubility increases with polarity. More falar sob mens mor soluble in water. Acryl group are non polar , so polarity will increase as follows - toi acrylglycerol < diaconigleed < monoacoylylecral OR We can also see this as. that solubility increases with lesser number of fatty acids. do a monocrylgleceral is most soluble cone ferty then digly to diacrylglesol (2 fattly acids) & then triacrylglescend (3 fatty acids). acid)

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