15. In the reaction NADH2 + FAD ---> NAD+ + FADH2, which reactant is oxidized as the reaction proceeds to the right?

a. NADH2    b. FAD     c. NAD+    d. FADH2

Note that reactants are on the left side of the arrow so choices (c) and (d) are obviously not correct.  Now you must determine which reactant is oxidized in this reaction.  Note that NADH2 loses hydrogen in this reaction.  One of the definitions of oxidation is a loss of hydrogen.  Can you give other definitions of oxidation?  of reduction?

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Emma Erdahl, Associate Professor of Biology
Northern Virginia Community College
Revised 8/23/00