Organelles Working Together

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  • Organelles Working Together
    • Protein Production
      • Proteins made at the ribosomes
        • The ribosomes on the RER make proteins that are excreted or attached to the cell membrane
        • The free ribosome in the cytoplasm makes proteins that stay in the cytoplasm
      • New proteins produced at the RER are folded and processed in RER
        • E.g, sugar chains are added
      • Then they're transported from the ER to the Golgi Apparatus in vesicles
      • The protein enter more vesicles to be transported around the cell
        • E.g. glyco-proteins (found in mucus) move tp the cell surface and are secreted
    • Cytoplasm function
      • The organelles in cells are surrounded by the cytoplasm
        • A solution of chemicals with network of protein threads running through it
          • These proteins are called the cytoskeleton
            • The organelles in cells are surrounded by the cytoplasm
              • A solution of chemicals with network of protein threads running through it
                • These proteins are called the cytoskeleton
        • In eukaryotic cells the protein threads are arranged in 2 ways
          • Microtubules (tiny protein cylinders)
          • Microfilaments (small solid strands)
            • The assembly of microtubules and microfilaments, and the movement of materials along them, requires energy from respiration
              • Microtubules (tiny protein cylinders)
              • So microtubules and microfilaments can be prevented from functioning using respiratory inhibitors
      • Cytoskeleton 4 main functions
        • The proteins can also cause the cell to move
          • E.g the movement of cilia and flagella is caused by cytoskeletal protein filaments that run through them
            • So in the case of single cells that have a flagellum (e.g. spree cells), the cytoskeleton propels the whole cell
        • They're  responsible for the movement within the cell
          • The movement of chromosomes when they separate during cell division depends on contraction of microtubules in the spindle
        • Help  to strengthen the cell & maintain its shape
        • Microtubules/filaments support the cell's organelles, keeping the  in position

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