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The first insights into the chemical nature of plasma membranes date back to __________

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The first insights into the chemical nature of plasma membranes date back to __________

(a) 1700

(b) 1790

(c) 1800

(d) 1890

This question was addressed to me in class test.

My query is from Cellular Membranes in section Cellular Membranes of Cell Biology

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The correct answer is (d) 1890

For explanation: The first insights into the chemical nature of cell membrane came from Ernst Overton of the University of Zürich during the 1890s. He stated that a substance entering the cell would first have to dissolve in the boundary layer of the cell.

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