The link between glycolysis and the Kreb's cycle is:

Identify the location of the enzyme for the given reaction in the Krebs cycle:
Succinic acid $+ FAD \rightarrow$ Fumaric acid $+ FADH_2$

Which enzyme is necessary for the following process?
Pyruvic acid $+ CoA + NAD^+ \rightarrow$ Acetyl $CoA + CO_2 + NADH + H^+$

Respiratory enzymes are present in

During the citric acid cycle,various organic acids undergo decarboxylation. Which of the following organic acids of the cycle have $4C$,$5C$,and $6C$ respectively?

In which of the following,reduction of $NAD$ does not occur?