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Part A-The role of 02 in electron transport - In mitochondrial electron transport, what is the direct role of 02? View Avalla
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In electron transport mechanism in mitochondria, oxygen plays a vital role by accepting electrons at the end of electron transport chain and get reduced. The reduced oxygen will pick up protons to form water molecules.

1/2O2 + 2H+ + 2e- -----> H2O

So, option b is correct. To function as final electron acceptor in the electron transport chain.

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