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Why electrons are transferred to oxygen in the last step of aerobic metabolism?

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what is the special properties of oxygen to be the last electron receptor?

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  1. Oxygen has an exceptionally high affinity for electrons (high electronegativity).  Think of the electron transport chain as a series of sequentially stronger magnets that attract electrons.  Each step has a greater attraction for the electron, until it gets to oxygen, which is the strongest.

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