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Subject - Chemistry:

Basics

MCQ - 283-2469

Question:

At the isoelectric point, α-amino acids are present as:

  1. H2N—CHR—COOH
  2. H3+/N—CHR–COOH
  3. NH2—CHR—COO–
  4. H3+/N—CHR–COOH

Correct Answer: D

Explanation:

In acidic medium, the cation (II) migrates towards cathode while in basic medium, anion (III) migrates towards anode on passing electric current. At a certain pH of the medium called isoelectric point of an amino acid, the structure behaves as a dipolar ion (NH3—CHR—COO2) and does not migrate to any electrode on passing current. Besides amphoteric amino acids we have acidic amino acids as well as basic amino acids and their isoelectric points are different

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