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

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

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

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
fractionated by electrophoresis then treated with an oxidizing agent followed by anionic detergent.

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Gel Electrophoresis
In an SDS-PAGE

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

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