Question

In 1962, Walter He described some micrographs as having the appearance of three layers, with two dense outer layers and a lighter middle layer. is a bilayer. In his paper, Stoeckenius also stated hat previous papers Which of the following explains the appearance of a three-layer membrane in micrographs? had established the bilayer structure of the membrane. The hydrophilic heads of the bilayer show up as two dense layers, whereas the hydrophobic O tails show up as a single, lighter layer. The bilnyger consiats of a dense protein layer. a less dense ydrophobic layer, and a dense hydrophilic head group Some specialized cells in the mammalian gut have a triple layer of phospholipids. Proteins are denser than lipids and make up the two outer layers. The inner layer is made up O O O of less dense The plasma membrane is made up of three layers where i is impermeable and two layers where it is selectively permeable Stoeckenius, W Structure of the plasma membrane: An electron-microscope study. Circulation 1962 26, 1066-69 O Check Answer @ Next 觋Exit

Answer 1

Answer:

1	The hydrophilic heads of the bilayer show up as two dense layers, whereas the hydrophobic tails show up as a single, lighter layer.
2	Spontaneously formed lipid monolayer in aquoes solution.

In the plasma membrane structure, there is a hydrophilic (water loving) head that projects to exterior of cell and a hydrophobic tail that projects towards cell interior. . The 3 layers comprise actually of dense hydrophilic head and lighter hydrophilic tail.

A protocell means a spontaneously formed lipid monolayer in aqueous solution. The protocell can be thought of as ancestral cell of the living cell.