B) A molecule with both positive and negative charges, having no overall net charge. Amino acids at their pI exist as zwitterions: NH3+ (positive) and COO− (negative) on the same molecule, net charge zero.

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A zwitterion is:

A A neutral atom

B A molecule with both positive and negative charges, having no overall net charge

C A single ion

D A radical

✓ Correct Answer: Option B

Amino acids at their pI exist as zwitterions: NH3+ (positive) and COO− (negative) on the same molecule, net charge zero.

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A zwitterion is:

✓ Correct Answer: Option B

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