The Krebs cycle takes place in

The process used in the conversion of pyruvate to acetyl $CoA$ is:

Identify $A$ and $B$ in the given reaction:
$\text{Pyruvic acid} + \text{CoA} + \text{NAD}^+ \xrightarrow{\text{Mg}^{2+}} A + B + \text{NADH} + \text{H}^+$

The mineral activator required for the carboxylase enzymes of the $TCA$ cycle is

Krebs' cycle was discovered by Krebs in pigeon muscles in $1940$. Which step is called gateway step/link reaction/transition reaction in respiration?

Which of the following forms the connecting link between glycolysis and Kreb's cycle?