What is the site for the $Krebs$ cycle?

The enzymes of the $TCA$ cycle are located in the mitochondrial matrix,except for one which is located in the inner mitochondrial membrane in eukaryotes and in the cytosol in prokaryotes. This enzyme is:

Which is the $5C$ intermediate molecule in the $TCA$ cycle?

Net yield of $ATP$ molecules in aerobic respiration during Krebs' cycle per glucose molecule is

Which intermediate compound is involved in the synthesis of amino acids?

How many $ATP$ molecules are produced directly in one $Krebs$ cycle per acetyl-$CoA$ molecule?