Gel Electrophoresis
In a native PAGE, proteins are separated on the basis of

net negative charge
net positive charges size
net positive charge
net charge and size

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Gel Electrophoresis
In an SDS-PAGE

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

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

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

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