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A mixture contains three similarly sized peptides P, Q and R. The peptide P is positively charged, Q is weakly negative, and R is strongly negative. If this mixture is passed through an ion-exchange chromatography column containing an anionic resin, their order of elution will be

A. P, Q, R

B. R, Q, P

C. Q, R, P

D. P, Q and R elute together

Answer: Option B

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