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

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

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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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Gel Electrophoresis
Electrophoresis of histones and myoglobin under non-denaturing conditions (pH = 7.0) results in

both proteins migrate to the anode
histones migrate to the cathode and myoglobin migrates to the anode
histones migrate to the anode and myoglobin migrates to the cathode
both proteins migrate to the cathode

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