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because cells were unable to be seen without the aid of an electron microscope
None can. They have to be seen using a electron microscope.
only under an electron microscope wiki it
An electron microscope has a much higher magnifying power and resolution than a regular light microscope. One can visualize molecules and even atoms using an electron microscope. This is not possible with a light microscope
Electron microscope
True.
light microscope or SEM or TEM electron microscopy
As viruses cannot be seen with the optical microscope, electron microscopes are used. All the "lenses" in an electron microscope are magnetic fields produced by electromagnets and/or electrostatic fields produced by electrically charged metal plates and/or rings.
Viruses are too small to be seen directly with a light microscope.Can be seen when it's examined under an electron microscope
The most important part of the electron microscope is the eyepiece and the magnifier.
electron microscope
Will proper staining and the right organism the nucleus of a cell can be seen without an electron microscope.