Kreb cycle | Citric acid cycle | Tricarboxylic acid cycle | Class 11th by be educated

Kreb cycle | Citric acid cycle | Tricarboxylic acid cycle | Respiration in plants | Class 11th by be educated
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about this video :-
In this video I have discussed about citric acid cycle or kreb cycle or tricarboxylic acid cycle of class 11th Plant physiology
chapter name - Respiration in plants
NCERT:
Tricarboxylic Acid Cycle:
The TCA cycle starts with the condensation of acetyl group with oxaloacetic
acid (OAA) and water to yield citric acid (Figure 14.3). The reaction is
catalysed by the enzyme citrate synthase and a molecule of CoA is released.
Citrate is then isomerised to isocitrate. It is followed by two successive
steps of decarboxylation, leading to the formation of α-ketoglutaric acid and then succinyl-CoA. In the remaining steps
of citric acid cycle, succinyl-CoA is oxidised
to OAA allowing the cycle to continue. During
the conversion of succinyl-CoA to succinic
acid a molecule of GTP is synthesised. This is
a substrate level phosphorylation. In a
coupled reaction GTP is converted to GDP with
the simultaneous synthesis of ATP from ADP.
Also there are three points in the cycle where
NAD+ is reduced to NADH + H+ and one point where FAD+ is reduced to FADH2. The
continued oxidation of acetyl CoA via the TCA
cycle requires the continued replenishment of
oxaloacetic acid, the first member of the cycle.
In addition it also requires regeneration of
NAD+ and FAD+ from NADH and FADH2
respectively.
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