Isoelectric Point
Mediumchemistry
At isoelectric point, an amino acid exists as:
Select the correct option:
Solution
Incorrect! Answer:
Zwitterion
The Isoelectric Point (pI) is the specific pH at which an amino acid molecule carries no net electrical charge.
- At this pH, the amino acid exists primarily as a Zwitterion (a dipolar ion having both a positive NH3+ and a negative COO− group).
- At pH<pI, it exists as a cation.
- At pH>pI, it exists as an anion.
- Amino acids show minimum solubility at their isoelectric point.
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About This Question
- Subject
- chemistry
- Chapter
- biomolecules
- Topic
- isoelectric point
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Zwitterion
The Isoelectric Point (pI) is the specific pH at which an amino acid molecule carries no net electrical charge.
- At this pH, the amino acid exists primarily as a Zwitterion (a dipolar ion having both a positive NH3+ and a negative COO− group).
- At pH<pI, it exists as a cation.
- At pH>pI, it exists as an anion.
- Amino acids show minimum solubility at their isoelectric point.
This medium difficulty chemistry question is from the chapter biomolecules, covering the topic of isoelectric point. It appeared in the 2025 exam.
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