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.

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.

💡 Why is B) the correct answer?

The correct answer to the question "A zwitterion is:" is Option B: A molecule with both positive and negative charges, having no overall net charge.

The other options — A) A neutral atom, C) A single ion, D) A radical — are incorrect for this PCAT Exam Prep question. As explained above: Amino acids at their pI exist as zwitterions: NH3+ (positive) and COO− (negative) on the same molecule, net charge zero.

📚 About This PCAT Exam Prep Practice Question

This 2-level PCAT Exam Prep question from the Chemical Processes topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free PCAT Exam Prep practice test or use flashcards for spaced repetition review.

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A zwitterion is:

✓ Correct Answer: Option B

📚 About This PCAT Exam Prep Practice Question

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