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  • How many electrons are taken up by an oxidant in the 1st halfreaction (oxidant reaction),
and
  • how many electrons are given free by a reductant in the 2st halfreaction (reductant reaction)
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  • How many electrons are taken up by an oxidant in the 1st halfreaction (oxidant reaction),
and
  • how many electrons are given free by a reductant in the 2st halfreaction (reductant reaction)
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  • How many electrons are taken up by an oxidant in the 1st halfreaction (oxidant reaction),
and
  • how many electrons are given free by a reductant in the 2st halfreaction (reductant reaction)
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cellular respiration requires a oxidant and reductant. the most common oxidant for aerobic organisms is elemental oxygen

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Sulfur is taken up be plants as sulfate which must be reduced to sulfide in order for plants to make use of it. Sulfate must first be activated to adenosine 5-phosphosulfate (APS) which is catalyzed by ATP sulfurylase. The APS is then reduced to sulfite with the help of APS reductase with glutathione as a reductant. The sulfite is then reduced to sulfide by sulfite reductase with ferredoxin as a reductant.

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The first half reaction concerns oxidant takenig up (an) electron(s), the other half is the one with a reductant producing (an) electron(s).

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