cell structure

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cell structure

see CELL.

cell structure

common intracellular features (nucleus, cytoplasm, cell membrane) and organelles (endoplasmic reticulum, lysosomes, mitochondria, microtubules, Golgi apparatus) which facilitate specialist function (see Table 1)
Table 1: Cell organelles
StructureCharacteristic
Cell membraneBimolecular lipid and protein membrane that surrounds the cell
• Bi-layer of non-polar lipid molecules (phosphatidylcholine, phospharidylethanolamine, cholesterol) that acts as a barrier to water and hydrophilic solutes
• Proteins:
  • Structural proteins

  • Protein pumps that actively transport ions such as sodium out of the cell

  • Carrier proteins that carry molecules such as glucose into the cell

  • Ion channel proteins, such as sodium ion channels in nerve fibres to which molecules of local anaesthetic attach to prevent the passage of the pain-inducing nerve impulse

  • Receptor proteins, such as insulin receptors which facilitate the passage of glucose into the cell

  • Immunoglobulin proteins, which form part of the immune response mechanism

  • Enzyme proteins, such as alkaline phosphatase

Cell cytoplasmThe gel-like matter contained within the membrane envelop:
• Contains and supports specialized organelles, including the cell nucleus, endoplasmic reticulum, the Golgi apparatus, mitochondria and lysozomes
• Stores substances (glycogen and lipids)
• Synthesizes and metabolizes essential substances (amino acids, fatty acids, monosaccharides)
• Synthesizes and translates protein
• Contains microtubules which help maintain the form of the cell and form intercommunication channels between organelles
Cell cytoskeletonA complex network of structural elements (microtubules, intermediate filaments and microfilaments) which determine the shape of the cell, its ability to move and its response to external stimuli
Cell nucleusPresent in all eukaryotic cells capable of mitosis
Contains the cell genome (DNA) and the means of replication and transcription of RNA
Separated from the cytoplasm by the nuclear envelop (which disappears during mitosis and meiosis)
Contains the nucleolus, where ribosomes are synthesized
Intercellular connectionsThere are two types of intercellular connections: tight junctions and gap junctions
Cell adhesion molecules (CAMs)Structures (receptor integrins, immunoglobulin adhesion molecules, Ca+-dependent cadherins and carbohydrate-binding selectins) within the cell membrane that bond to laminins within the extracellular matrix to attach adjacent cells to one another and to the basal membrane
References in periodicals archive ?
As the model helps to make clear, there is still much to be discovered about the basic logic of eukaryotic cell organisation.
John Lidderdale, Chairman of SHFCA added : This MOU with the CHFCA supports the ambition we have for SHFCA to achieve the largest membership base of any hydrogen and fuel cell organisation in the world.
Cath Davidson, who chairs the CELL organisation representing the villages of Cress-well, Ellington, Lynemouth and Linton, said: "It looks like they are never going to let us regenerate and we are very upset about these opencast plans, especially people in Ellington who have paid quite large sums for their houses.
The company has been working with Castle Morpeth Council, local regeneration group Energi and the Cell organisation - representing Cresswell, Ellington, Lynemouth and Linton - to come up with a scheme which wins the approval of villagers.
Yesterday, Cath Davidson, who chairs the CELL organisation representing the neighbouring villages of Cresswell, Ellington, Lynemouth and Linton, said residents were still to be convinced that wind turbines would help regenerate the area.
UK Coal is working with the CELL organisation ( representing the villages of Cresswell, Ellington, Lynemouth and Linton ( and planning officials at Castle Morpeth Council to come up with a scheme which wins the approval of local people.