John Cell Membrane - Portland State University

John Lenyo Corrina Perez Hazel Owens

Cell Membrane



? Cell membranes are composed of proteins and lipids. ? Since they are made up of mostly lipids, only certain

substances can move through.

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?Phospholipids are the most abundant type of lipid found in the membrane. Phospholipids are made up of two layers, the outer and inner layers. The inside layer is made of hydrophobic fatty acid tails, while the outer layer is made up of hydrophilic polar heads that are pointed toward the water.

academic.brooklyn.cuny.edu

?Membrane structure relies on the tendency of fatty acid molecules to spread on the surface of water. ? Membrane proteins (which take up half of the membrane) determine what gets into and leaves the cell. ?Glycolipids are found on the outer part of the cell membrane.

Single Chain vs. Phospholipid

? Single chain lipids were assumed to be the first of those to form cell membranes with the more complex phospholipids evolving later

? Phospholipids can be synthesized in an abiotic environment without enzymes now

? Phosphoplipid bilayers now make up the plasma cell membranes that regulate movement into and out of prokaryotic and eukaryotic cells.

Single chain lipid

. expansion

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Types of Lipids

? Today Plasma Membranes are made primarily of phospholipids

? It is thought that early membranes may have been made of simpler fatty acids.



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