Scenario #3: Arsenic poisoning. Ralph worked in a zinc refinery for 30 years. He never missed a day’s work until about a month ago when he began to experience frequent headaches, long periods of confusion, with attendant severe diarrhea, and drowsiness. Arsenic inhibits the breakdown of pyruvate.   1.    Which cellular respiration pathway is directly affected by arsenic poisoning? a.    All cellular respiration pathways are affected b.    Glycolysis c.     Electron transport chain d.    Kreb’s cycle     2.       Which of the following cellular respiration processes will NOT be affected by the arsenic? a.    Reduction of NAD+ and FAD during Kreb’s cycle b.    Production of pyruvic acid c.     Electrons will not be delivered to the oxygen to make water d.    Creating an electrochemical gradient across the mitochondrial membrane

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