Question

What is the purpose of the TCA cycle?

Answer 1

We have to know that the citric acid cycle (CAC) – otherwise called the TCA cycle or the Krebs cycle – is a progression of chemical reactions utilized by all high-impact organic species to deliver energy that is stored through the oxidation of acetyl-CoA obtained from starches, fats, and proteins.

Complete answer:
We have to know that TCA stands for tricarboxylic acid cycle.
We should know that the citric acid cycle is a key metabolic pathway that associates starch, fat, and protein digestion. The reaction of the cycle is done by eight compounds that totally oxidize acetate (a two carbon atom), as acetyl-CoA, into two molecules, every one of carbon dioxide and water. By the catabolism of sugars, fats, and proteins, the two-carbon natural product acetyl-CoA (a type of acetate) is delivered which enters the citric acid cycle. The reactions of the cycle additionally convert three reciprocals of nicotinamide adenine dinucleotide $\left( {NA{D^ + }} \right)$ into three counterparts of diminished $NA{D^ + }$ (NADH), one equivalent of flavin adenine dinucleotide (FAD) into one equivalent of FADH2, and one equivalent of guanosine diphosphate (GDP) and inorganic phosphate (Pi) into one equivalent of guanosine triphosphate (GTP). The NADH and FADH2 created by the citric acid cycle are, thus, utilized by the oxidative phosphorylation pathway to produce energy-rich ATP.
The purpose of TCA is,
-Source of skeletons of carbon to be used in biosynthesis.
-For the production of NADH and FADH2.
-For the production of GTP which is the functional equivalent of ATP.

Note:
We have to remember that the name of this metabolic pathway is derived from the citrus extract (a tricarboxylic acid, regularly called citrate, as the ionized structure prevails at organic pH that is devoured and afterward recovered by this arrangement of reactions to finish the cycle.