In the $Krebs$ cycle,$FADH_2$ is produced during the conversion of which of the following?

Which of the following enzymes is not used in the $Krebs$ cycle?

The enzyme mediating the reactions of the $Krebs$ cycle during cellular respiration in animals is found in:

When $1$ molecule of pyruvic acid passes through the process of the Krebs cycle,$a$ molecules of $CO_2$ are released and at $b$ different stages $2H^+$ and $c$ electrons are released. Identify $a, b, c$.

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

Which of the following is a precursor of protochlorophyll?