If Protein a Has a PI of 3

question 73

Multiple Choice

If protein A has a pI of 3.1, protein B has a pI of 6.8, and protein C has a pI of 8.9, which protein would elute FIRST from a cation exchange column at pH 7?

• A) protein A
• B) protein B
• C) protein C
• D) All three proteins would elute at the same time from the column.
• E) Not enough information about the proteins is given in the problem.

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