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Aim: What instruments have aided in our knowledge of the cell? What do you know about viruses? They can make you very sick They can be transmitted from person to person There are different types of viruses HOW BIG IS A VIRUS? Too small to be seen with a light microscope •They are microscopic and smaller than cells! Electron Microscope Used to view extremely small structures inside cells & viruses Utilizes an electron beam instead of a light beam Can magnify up to a million times Subject must be dead and dry Light Microscope Our microscope has a maximum magnification of 400x. Useful for viewing larger organisms like bacteria and paramecium. What if you want to separate a mixture? Use A Centrifuge How does a centrifuge separate things? According to their density !