Determine whether the structure written in italics undergoes oxidation or reduction:

In a glycolysis step, the biomolecule NAD⁺ is converted into NADH.

What type of organic reaction is depicted below: condensation, hydrolysis, oxidation, or reduction?

Ascorbic acid, commonly known as vitamin C, is crucial for tissue repair and the enzymatic production of certain neurotransmitters. It is known to degrade over time when exposed to air, a process involving oxidation. One of these reactions is shown below. Circle the groups in the product that were oxidized.