MCAT Bio Biochem Practice Questions - MCAT Biological And Biochemical Foundations Of Living Systems Exam

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An amino acid has a pKa of 2.2 for its alpha-carboxyl group and a pKa of 9.2 for its alpha-amino group. At physiological pH (7.4), what is the predominant ionic form of this amino acid?

Fully protonated (cationic) form with +1 charge Zwitterion with net zero charge Anionic form with –1 charge on carboxylate Fully deprotonated (anionic) form with –2 charge

Correct Answer:

Zwitterion with net zero charge

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