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

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

How many $ATP$ molecules are produced by substrate-level phosphorylation during the complete oxidation of one molecule of pyruvic acid?

In which of the following organisms does the Krebs cycle not occur in the mitochondria?

Describe the process occurring in the matrix of mitochondria.

All enzymes of the $TCA$ cycle are found in the mitochondrial matrix. Exceptionally, one enzyme is located on the inner mitochondrial membrane in eukaryotes and in the cytoplasm in prokaryotes. Identify this enzyme.