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Electron Microscopes quiz

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  • What do electron microscopes use for imaging instead of light?
    Electron microscopes use electrons for imaging instead of light.
  • What is the maximum magnification electron microscopes can achieve?
    Electron microscopes can achieve magnification up to 10,000,000 times.
  • What is the maximum resolution provided by electron microscopes?
    Electron microscopes can provide resolution up to 0.3 nanometers.
  • Why are electron microscopes generally limited to viewing nonliving specimens?
    The complex sample preparation required for electron microscopes usually kills living cells, limiting their use to nonliving specimens.
  • What are the two main types of electron microscopes?
    The two main types are Transmission Electron Microscopes (TEM) and Scanning Electron Microscopes (SEM).
  • What type of image does a Transmission Electron Microscope (TEM) produce?
    A TEM produces a two-dimensional (2D) image.
  • How does a TEM create its image?
    A TEM creates its image by passing a beam of electrons through a very thin specimen slice.
  • What is the main use of TEM in cell biology?
    TEM is mainly used to visualize internal cell structures.
  • What is a common drawback of TEM sample preparation?
    Complex sample preparation for TEM can introduce artificial artifacts that may be mistaken for real cell structures.
  • What type of image does a Scanning Electron Microscope (SEM) produce?
    A SEM produces a three-dimensional (3D) image.
  • How does a SEM create its image?
    A SEM creates its image by detecting electrons that scatter off the surface of the specimen.
  • What is the main use of SEM in cell biology?
    SEM is mainly used to visualize external cell structures on the surface of specimens.
  • Are images from electron microscopes naturally colored?
    No, images from electron microscopes are naturally black and white but can be color-enhanced by computers.
  • Why are electron microscopes considered more powerful than light microscopes?
    Electron microscopes provide much higher magnification and resolution than light microscopes.
  • What is one reason why electron microscopes are expensive and complex?
    They require advanced equipment and detailed sample preparation, making them expensive and complex to operate.