The structural and operational unit of life is the cell. A structure that resembles a bubble called a cell membrane surrounds each and every cell in the body.
Cell biologists used electron microscopy in the 1950s to confirm the existence of plasma membranes.
Robertson asserts that the fundamental structure of all cell membranes is the same. According to this hypothesis, the cell membrane has a trilamellar structure, meaning that it is made up of three proteins.
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