Tamilnadu BoardEnglish MediumSTD 11BIO BOTANYRespiration3 Marks
Question
What is a redox reaction?
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Answer
$NAD^{+}+2 e^{-}+2 H^{+} \rightarrow NADH+H^{+}$
$FAD+2 e^{-}+2 H^{+} \rightarrow FADH_2$
When $NAD ^{+}$(Nicotinamide Adenine Dinucleotide - oxidised form) and FAD (Flavin Adenine Dinucleotide) pick up electrons and one or two hydrogen ions (protons), they get reduced to $NADH + H ^{+}$and $FADH _2$ respectively. When they drop electrons and hydrogen off they go back to their original form. The reaction in which NAD ${ }^{+}$and FAD gain (reduction) or $f$ lose (oxidation) electrons are called redox reaction (Oxidation reduction reaction). These reactions are important in cellular respiration.
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