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bilayer in Biological Definition

Cell membrane

... or plasmalemma ) is a thin and structured bilayer of phospholipid and protein molecules that ... compartments. The foundation is a phospholipid bilayer , and the membrane as a whole is often described ... or hopanoids (in case of prokaryotes) in the bilayer assist in regulating fluidity. Detailed ...

Lipid bilayer

... A DPPC bilayer simulation Color scheme: PO4 = green, N(CH3)3 = ... = grey In biology and chemistry , a lipid bilayer is a membrane or zone of a membrane composed only of lipid molecules. The lipid bilayer is the foundation of all biological membranes , ...

Cell membrane

... or plasmalemma ) is a thin and structured bilayer of phospholipid and protein molecules that ... compartments. The foundation is a phospholipid bilayer , and the membrane as a whole is often described ... or hopanoids (in case of prokaryotes) in the bilayer assist in regulating fluidity. Detailed ...

Lipid

... nonpolar tails of lipids ( U ) tend to cluster together, forming a lipid bilayer (1) or a micelle (2). The polar heads ( P ) face the aqueous ... together. Figure 2: Self-organization of lipids. A lipid bilayer is shown on the left and a micelle on the right. The ...

Phospholipid

... is said to be hydrophobic . When placed in water, phospholipids form a bilayer , where the hydrophobic tails line up against each other, and forms a ... over the membrane. See also biochemistry lipid lipid bilayer antiphospholipid syndrome References Berg, J.M., J.L. ...

Transmembrane receptor

... The polypeptide chains of the simplest are predicted to cross the lipid bilayer only once, while others cross as many as seven times (the so-called ... cell or organelle. If the polypeptide chain of the receptor crosses the bilayer several times, the external domain can comprise several "loops" sticking ...

Biological membrane

... A biological membrane or biomembrane is a membrane which acts as a barrier within or around a cell . It is a lipid bilayer , being composed of a double layer of lipid -class molecules , specifically phospholipids , with occasional proteins intertwined, some of which ...

Cell biology

... Adhesion Chloroplast Cilia Cytoplasm Cytoskeleton Endoplasmic reticulum Flagella Glycolysis Golgi apparatus Lipid bilayer Membrane Mitochondrion Nucleus Organelle Passive transport Ribosome Signal transduction Vesicle Important ...

Chloroplast

... take, and are generally considered to have originated as endosymbiotic cyanobacteria . In green plants chloroplasts are surrounded by two lipid bilayer membranes , now thought to correspond to the outer and inner membranes of the ancestral cyanobacterium. The genome is considerably reduced ...

Chloroplast membrane

... function. Like mitochondria , chlorplasts have a double-membrane envelope, called the chloroplast envelope . Each membrane is a phospholipid bilayer , between 6 and 8 nm thick, and the two are separated by a gap of 10-20nm, called the intermembrane space. The outer membrane is permiable to most ...

Endomembrane system

... attached to either side or traversing them. The following organelles are part of the endomembrane system: The plasma membrane is a lipid bilayer membrane that separates the cell from its environment and regulates the transport of molecules and signals into and out of the cell. The nuclear ...

Glycolipid

... cell surface membrane . The carbohydrates are found on the outer surface of all eukaryotic cell membranes. They extend from the phospholipid bilayer into the aqueous environment outside the cell where it acts as a recognition site for specific chemicals as well as helping to maintain the stability ...

Ion channel

... a circular arrangement of identical or related proteins closely packed around a water-filled pore through the plane of the membrane or lipid bilayer . While large-pore channels permit the passage of ions more or less indiscriminately, the archetypal channel pore is just one or two atoms wide at ...

Peripheral membrane protein

... proteins are proteins that adhere only loosely to the biological membrane with which they are associated. These molecules do not span the lipid bilayer core of the membrane, but attach indirectly, typically by binding to integral membrane proteins , or by interactions with the lipid polar head. ...

Transmembrane protein

... transmembrane protein is an integral membrane protein that spans from the internal to the external surface of the biological membrane or lipid bilayer in which it is embedded. Extraction of a transmembrane protein in the absence of a detergent will result in aggregation and precipitation of the ...

Vesicle

... In cell biology , a vesicle is a relatively small and enclosed compartment, separated from the cytosol by at least one lipid bilayer . Vesicles store, transport , or digest cellular products and wastes . This biomembrane enclosing the vesicle is the same as that of the ...
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