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Skill check: Cellular respiration

Problem

In a redox (oxidation-reduction) reaction, one or more electrons are transferred from one molecule to another.
  1. In a redox reaction, the molecule that loses electrons is
    , and the molecule that gains those electrons is
    .
  1. In one step of cellular respiration, the molecule succinate (start text, C, end text, start subscript, 4, end subscript, start text, H, end text, start subscript, 6, end subscript, start text, O, end text, start subscript, 4, end subscript) is converted to fumarate (start text, C, end text, start subscript, 4, end subscript, start text, H, end text, start subscript, 4, end subscript, start text, O, end text, start subscript, 4, end subscript) in the reaction:
    start text, C, end text, start subscript, 4, end subscript, start text, H, end text, start subscript, 6, end subscript, start text, O, end text, start subscript, 4, end subscript plus start text, F, A, D, end text right arrow start text, C, end text, start subscript, 4, end subscript, start text, H, end text, start subscript, 4, end subscript, start text, O, end text, start subscript, 4, end subscript plus start text, F, A, D, H, end text, start subscript, 2, end subscript
    In the conversion of succinate to fumarate, which molecule is oxidized and which is reduced?
     
    Oxidized
    Reduced
    start text, F, A, D, end text
    start text, C, end text, start subscript, 4, end subscript, start text, H, end text, start subscript, 6, end subscript, start text, O, end text, start subscript, 4, end subscript
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