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  4. In the TCA cycle, GTP is formed during which of these reactions:

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Q. In the TCA cycle, GTP is formed during which of these reactions:

NTA AbhyasNTA Abhyas 2020Respiration in Plants

Solution:

In TCA cycle, oxaloacetic acid along with water undergoes condensation to form citric acid in the presence of citrate synthase which is then followed by its isomerization into isocitrate. This further undergoes decarboxylation twice to form alpha-ketoglutaric acid and then succinyl-CoA. Succinyl- CoA is then converted to succinic acid and a molecule of GTP is released. This forms the substrate level of phosphorylation.