When glucose donates electrons to NAD⁺ creating NADH, the glucose molecule becomes:

• A. Hydrolyzed.
• B. Oxidized.
• C. Neutral.
• D. Reduced.

Answer: (B)

Verified step by step guidance

1. Understand the concept of oxidation and reduction: Oxidation involves the loss of electrons, while reduction involves the gain of electrons.
2. Identify the role of glucose in the reaction: Glucose donates electrons to NAD+, which means glucose is losing electrons.
3. Relate the loss of electrons to oxidation: Since glucose is losing electrons, it is undergoing oxidation.
4. Consider the role of NAD+: NAD+ is gaining electrons from glucose, which means NAD+ is being reduced to NADH.
5. Conclude that when glucose donates electrons to NAD+, it is oxidized, as oxidation is defined by the loss of electrons.