Respiratory enzymes are located in

Pyruvate dehydrogenase complex,needed for the conversion of pyruvic acid to acetyl CoA,is located in . . . . . .

Hydrogen of malate is accepted by

$A$ vitamin which plays a metabolic role in the conversion of pyruvic acid into acetyl $CoA$ is

$A$: Succinyl $CoA$ is the precursor of pyrrole group-containing compounds.
$R$: Succinyl $CoA$ is an intermediate of the $TCA$ cycle.

Kreb's cycle is also known as