Transport of solutes across membranes
Cells are surrounded by a cell membrane, which consists of a double layer of lipid molecules. Only small, lipophilic (fat-loving) substances (gases, ethanol) can pass this membrane unaided, most biologically relevant molecules are hydrophilic (water-loving), they can not pass the cell membrane freely. Water too can penetrate the membrane only slowly. This allows the cell to actively maintain an internal composition that is different from the outside environment, one of the characteristics of life.
KeywordsBrown Adipose Tissue Phosphatidyl Choline Proton Gradient Nucleotide Binding Site Phosphatidyl Ethanolamine
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