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Gorter and Grendel investigated the structure of the surface membrane of cells. They extracted the phospholipids from the surface membranes of red blood cells in 1 cm3 of blood and placed them in the apparatus shown in Figure 1.
Piston Single layer of phospholipid molecules
Water
Figure 1

The piston was pushed across the surface of the water until the phospholipid molecules were tightly packed into a single layer. The area covered by the phospholipid molecules was measured. This area was compared with the estimated surface area of the red blood cells from which phospholipids were extracted.
Gorter and Grendel obtained the data shown in the table.
Number of red blood cells per cm3 of blood 4.74 × 109 Estimated mean surface area of one red blood cell 99.4 ∝m2 Surface area of membrane phospholipids extracted from 1cm3 of blood 0.92 m2
(a) Explain what these data suggest about the arrangement of phospholipids in the surface membranes of red blood cells. Support your explanation with suitable calculations. Show your working.
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need help in calculation
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