LABORATORY REVIEW
CELL RESPIRATION
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Detailed explanation-1: -In Kreb’s cycle the oxidation or dehydrogenation reaction occurs 4 times as follows: Isocitrate to alpha-ketoglutarate (NADH is formed) alpha-ketoglutarate to succinyl co-A (NADH is formed)
Detailed explanation-2: -Step four of the Krebs Cycle: -Ketoglutarate Dehydrogenase Figure: Formation of succinyl-CoA In the fourth reaction of the citric acid cycle, an oxidative decarboxylation takes place. This means that again a CO2 molecule is relased (decarboxylation) and that an odixation takes place.
Detailed explanation-3: -There are four redox reactions in the Krebs cycle.
Detailed explanation-4: -Two acetyl-CoA molecules enter the cycle, and each has two carbon atoms, so four carbon dioxide molecules will form.
Detailed explanation-5: -In the oxidation reactions of the Krebs cycle, the hydrogen atoms (or the electrons derived from them) do not react directly with oxygen, but pass through a series of hydrogen or electron carriers, the respiratory chain.