Gel Electrophoresis
Proteins can be visualized directly in gels by

none of these
using electron microscope only
staining them with the dye
measuring their molecular weight

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Gel Electrophoresis
In SDS-PAGE, the protein sample is first

None of these
treated with a oxidizing agent and then with anionic detergent followed by fractionation by electrophoresis
fractionated by electrophoresis then treated with an oxidizing agent followed by anionic detergent.
treated with a reducing agent and then with anionic detergent followed by fractionation by electrophoresis

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