qCell Structure and Functionthen took these membranes, dissolved them in lipid solvents, and poured the lipidsolution as a layer one molecule thick over water. They re-measured the lipid surfacearea of this one molecule thick layer. The values they obtained are shown in this able.Don't be concerned with the large differences in surface areas between animals - differentvolumes of blood were used to exfiact the membrane lipids. Study the table and answerquestions I and2.It is apparent that the one molecule thick layer of lipid has a surface area that isapproximately twice that of the cell membrane surface area. This suggests that the cellmembrane is made up of two layers of lipids.Turn to page 10. There is water inside and outside cells in the body of organisms.If the cell membrane has rwo layers of phospholipid, how do you think the two layerswould be arranged? The three possibilities are shown on page 10.
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