Biological membrane
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Biological membrane
A biological membrane or biomembrane is a membrane which acts as a barrier within or around a cell.
The main lipid component of biological membranes (phospholipid bilayer). Phospholipids are a heterogeneous type of molecule composed of glycerol, phosphate, two fatty acid residues, and 'headgroups' with different chemical properties.
The acid components of the bicarbonate system (i.e. H+ and CO2) cross biological membranes rapidly, thus do not depend on complex transport kinetics.
In biological systems, osmosis is essential since many biological membranes are semipermeable, and it leads to different physiological effects.
The movement of a substance across a biological membrane against its concentration or electrochemical gradient, with the help of energy input and specific transport proteins.
adaptation ...
peripheral protein A protein on the surface of a biological membrane.
peripheral Structure or location distant from center, near outer boundaries.
periproct Region of aboral plates around the anus of echinoids.
phospholipid - the major category of lipid molecules used to construct biological membranes. Generally composed of two fatty acids linked through glycerol phosphate to one of a variety of polar groups.
Membrane A semi-fluid layer of lipids and proteins. Biological membranes enclose cells and organelles and control the passage of materials into and out of them.
Phospholipid. A class of lipid molecules in which a phos- phate group is linked to glycerol and two fatty acyl groups. A chief component of biological membranes. (See Inositol phospholipid.) ...
A chief component of biological membranes. (See Inositol phospholipid.) Phosphorylation. The addition of a phosphate group to a compound. Physical map.
 See also: Membrane, Cell, Protein, Proteins, Trans
  
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