Question

Why is Krebs cycle called TCA cycle?​

Answer 1

When Acetyl-CoA enters the Krebs cycle it combines with a four-carbon acid called oxaloacetic acid. The combination forms the six-carbon acid called citric acid. ... Because citric acid is the very first product generated by this sequence of chemical conversions, and it is also regenerated at the end of the cycle.

Answer 2

$\Huge{\red{\underline{\textsf{Explaination}}}}$

$\purple\bigstar$Krebs cycle :-

$\orange\star$ Pyruvic acid produce during Glycolysis undergoes aerobic oxidation in the mitochondrial matrix through TCA cycle.

$\orange\star$ It is common oxidative pathway for carbohydrate, fat, proteins.

$\orange\star$ Intermediate compounds are used in synthesis of glutamate and asprated.

$\orange\star$ First pyruvic acid enter into mitochondria then it is decarboxylated and remaining 2 carbon fragment combines with Co enzyme A to form acetyl Co - A.

$\orange\star$ It is oxidative decarboxylation process which produces $\sf H_^{+}$ ions, electrons and carbon dioxide.

$\orange\star$ $\sf \beta$ oxidation of fatty acid produces acetyl co - A.

$\orange\star$ Acetyl Co-A condensed with oxyaloacetate to form citric acid.

$\orange\star$ The mitochondrial enzyme envoled to oxidise citric acid and releases carbon dioxide and oxyaloacetate regenerated again to complete cycle.

$\orange\star$ In this cycle 4 steps of oxidation is carried by dehydrogenase using an enzyme $\sf NAD^{+}$ and $\sf FAD^{+}$

$\orange\star$ Co enzymes are produced to$\sf NAD^{+}H^{+}$ and $\sf FADH_2$. This transfer their electron to the mitochondrial respiratory chain.