How many $ATP$ molecule$(s)$ is/are directly formed during one turn of Krebs cycle?

Where does the $TCA$ cycle take place?

The membrane-bound enzyme involved in the Kreb's cycle is:

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.

Acetyl $Co-A$ binds to oxaloacetic acid to form

Respiratory enzymes are located in