Two monomeric His-tagged proteins of identical molecular weight are present in a solution. pIs of these two proteins are 5.6 and 6.8. Which one of the following techniques can be used to separate them?
A. Denaturing polyacrylamide gel electrophoresis
B. Size-exclusion chromatography
C. Ion-exchange chromatography
D. Nickel affinity chromatography
Answer: Option C

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