NADPH Is a Two Electron Donor

question 41

Multiple Choice

NADPH is a two electron donor. Heme can only accept one electron. How is this accommodated in the microsomal electron transport chain?

• A) NADPH binds heme, leaves, and rebinds heme
• B) NADPH donates on electron to an iron-sulfur protein
• C) NADPH gives electrons to a flavoprotein with two flavin groups
• D) NADPH gives electrons to two flavoproteins with one flavin group each
• E) NADPH transfers only one electron

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