Cell Organelles

Last update by maggielejune on 09/21/2010
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Plasma Membrane

Answer:
-found in prokaryotic and eukaryotic cells-serves as a semi-porous barrier to the outside environment

-allows nutrients and other essential elements to enter the cell and waste materials to leave the cell

-composed of a phospholipid bilayer

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Related Quiz Content
  • maggielejune
    Answered in Cell Organelles
    Nucleus
    nucleus-serves as the information processing and administrative center of the cell; stores the cell's hereditary material, or DNA, and it coordinates the cell's activities, which include growth, intermediary metabolism, protein synthesis, and reproduction (cell division)
    nuclear envelope-double-layered membrane that encloses the contents of the nucleus during most of the cell's life cyclenuclear pores-regulate the passage of molecules between the nucleus and cytoplasm, permitting some to pass through the membrane, but not others
    chromatin(DNA)-for DNA to function,it is combined with proteins and organized into a precise, compact structure, a dense string-like fiber called chromatin.
    nucleolus-a membrane-less organelle within the nucleus that manufactures ribosomes, the cell's protein-producing structures
  • maggielejune
    Answered in Cell Organelles
    Ribosomes
    -tiny organelles composed of approximately 60 percent ribosomal RNA (rRNA) and 40 percent protein-not bound by a membrane
    -ribosomes are mainly found bound to the endoplasmic reticulum and the nuclear envelope, as well as freely scattered throughout the cytoplasm
    -serve as the protein production machinery for the cell and are consequently most abundant in cells that are active in protein synthesis, such as pancreas and brain cells


  • maggielejune
    Answered in Cell Organelles
    Endoplasmic Reticulum
    -a network of flattened sacs and branching tubules that extends throughout the cytoplasm in plant and animal cells-allows molecules to be selectively transferred between the lumen and the cytoplasm
    smooth ER-chiefly involved with the production of lipids (fats), building blocks for carbohydrate metabolism, and the detoxification of drugs and poisons
    rough ER-directly continuous with the nuclear envelope which is also studded with ribosomes
  • maggielejune
    Answered in Cell Organelles
    Golgi Apparatus
    -to process proteins targeted to the plasma membrane, lysosomes or endosomes and those that will be formed from the cell, and sort them within vesicles-basically it functions as a central delivery system for the cell.


  • maggielejune
    Answered in Cell Organelles
    Mitochondria
    -provides the energy a cell needs to move, divide, produce secretory products, contract -the power centers of the cell. 
    -produce ATP
    -inner membrane forms folds called cristae
  • maggielejune
    Answered in Cell Organelles
    Peroxisomes
    -absorb nutrients that the cell has acquired-known for digesting fatty acids
    -responsible for protecting the cell from its own production of toxic hydrogen peroxide
  • maggielejune
    Answered in Cell Organelles
    Cytoskeleton
    -helps maintain cell shape-the internal movement of cell organelles, as well as cell locomotion and muscle fiber contraction could not take place without the cytoskeleton.
    microtubules-thick, strong spirals of thousands of subunits made of the protein called tubulin
    microfilaments-long, thin, and stringy proteins;work with microtubules to form the structure that allows a cell to hold its shape, move itself, and move its organelles
    intermediate filaments-function as tension-bearing elements to help maintain cell shape and rigidity, and serve to anchor in place several organelles, including the nucleus and desmosomes




  • maggielejune
    Answered in Cell Organelles
    Centrosomes
    -"microtubule organizing center" -area in the cell where microtubles are produced
    -in animal cell division, the centrosome divides



  • maggielejune
    Answered in Cell Organelles
    Lysosomes
    -contain hydrolytic enzymes necessary for intracellular digestion-in white blood cells that eat bacteria, lysosome contents are carefully released into the vacuole around the bacteria and serve to kill and digest those bacteria

  • maggielejune
    Answered in Cell Organelles
    Centrioles
    -are there to help the cell when it comes time to divide-a small set of microtubules arranged in a specific way; there are nine groups of microtubules

  • maggielejune
    Answered in Cell Organelles
    Flagella
    -how some cells and microorganisms travel-whip like tails that are used to propel the organism forward. 

Cell Organelles
Cell Organelles
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