Gel Electrophoresis
In isoelectric focusing, proteins are separated on the basis of their

relative content of positively charged residue only
size
relative content of negatively charged residue only
relative content of positively and negatively charged residue

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Gel Electrophoresis
In an SDS-PAGE

All of these
smaller proteins migrate more rapidly through the gel
proteins have the same charge-to-mass ratio
proteins are denatured by the SDS

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

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

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