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Encyclopedia > Endomembrane system

The endomembrane system is the system of internal membranes within eukaryotic cells that divide the cell into functional and structural compartments, or organelles. Prokaryotes do not have an endomembrane system and thus lack most organelles. A biological membrane or biomembrane is a membrane which acts as a barrier within or around a cell. ... Kingdoms Animalia - Animals Fungi Plantae - Plants Protista Eukaryotes (also spelled eucaryotes) are organisms with complex cells, in which the genetic material is organized into membrane-bound nuclei. ... Cells in culture, stained for keratin (red) and DNA (green) The cell is the structural and functional unit of all living organisms, sometimes called the building blocks of life. ... Schematic of typical animal cell, showing subcellular components. ... Prokaryotes (from Old Greek pro- before + karyon nut, referring to the cell nucleus, + suffix -otos, pl. ...


The endomembrane system also provides a transport system, for moving molecules through the interior of the cell, as well as interactive surfaces for lipid and protein synthesis. The membranes that make up the endomembrane system are made of a lipid bilayer, with proteins attached to either side or traversing them. Figure 1: Structure of a Lipid. ... A representation of the 3D structure of myoglobin, showing coloured alpha helices. ...


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 envelope is the membrane around the nucleus of the cell.
  • The endoplasmic reticulum is a synthesis and transport organelle [the endoplasmic reticulum is an extension of the nuclear envelope].
  • The Golgi apparatus acts as the packaging and delivery system for molecules.
  • Lysosomes are the "digestive" units of the cell. They utilize enzymes to break down macromolecules and also act as a waste disposal system.
  • Vacuoles act as storage units in some cells.
  • Vesicles are small membrane-enclosed transport units that can transfer molecules between different compartments.

  Results from FactBites:
 
Endomembrane system - definition of Endomembrane system in Encyclopedia (247 words)
The endomembrane system is the system of internal membranes within eukaryotic cells that divide the cell into functional and structural compartments, or organelles.
The endomembrane system also provides a transport system, for moving molecules through the interior of the cell, as well as interactive surfaces for lipid and protein synthesis.
The endoplasmic reticulum is a synthesis and transport organelle [the endoplasmic reticulum is an extension of the nuclear envelope].
Endomembrane System (162 words)
The endomembrane system is a collection of membranous structures involved in transport within the cell.
The main components of the endomembrane system are the endoplasmic reticulum, Golgi bodies, vesicles, cell membrane and nuclear envelope.
The endomembrane system is the transportation system of the cell.
  More results at FactBites »


 

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