Why does electron transport stop

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Q1. What colour does starch change to while tested with the benedicts reagent test and what colour does it change to when tested with water 1 percent pancreatic amylose and benedict reagent?

Q2. Without oxygen, cellular respiration grinds to a standstill, although glycolysis can continue to make some ATP anaerobically for a short time. While oxygen runs out, why does electron transport stop? Why do you thing the Krebs cycle stops?

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