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HESI A2 Exam Prep 2026

Real HESI A2 Questions.
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Practice with exam-accurate HESI A2 questions that match the real test in format, difficulty, and logic. Trusted by students accepted into nursing programs across the United States.

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8
Exam Sections
75%
Typical Pass Score
~5hr
Total Test Time
95%
Our Pass Rate

About Oxidation-Reduction (Redox) Reactions

In biological redox reactions, NAD⁺ acts as an oxidizing agent by gaining electrons and converting to NADH. Learn how it drives cellular metabolism.

Related Topics

Atomic StructurePeriodic Table & Periodic TrendsChemical Bonds (Ionic, Covalent, Metallic)Chemical Reactions & Balancing EquationsStoichiometry & Mole Concept
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Oxidation-Reduction (Redox) Reactions HESI A2 Practice Questions

Free Oxidation-Reduction (Redox) Reactions practice questions for the HESI A2 exam with detailed rationales.

Question 1 of 2

During a redox reaction in a biological system, NAD⁺ is converted to NADH. What role does NAD⁺ play in this reaction?

B. Reducing agent; it loses electrons
C. Catalyst; it remains unchanged
D. Base; it donates a proton
A. Oxidizing agent; it gains electrons