In aerobic respiration,where does pyruvic acid undergo complete oxidation?

The product formed by the action of malate dehydrogenase is ....

In the Krebs cycle,$\alpha$-ketoglutaric acid is converted into malic acid. During this phase,how many $NADH$,$FADH_2$,and $ATP$ are formed?

Match the columns based on the number of carbon atoms in the compounds involved in the Krebs cycle:

Column-$I$	Column-$II$
$(a)$ $4$ $C$ compound	$(1)$ Acetyl $CoA$
$(b)$ $2$ $C$ compound	$(2)$ Pyruvate
$(c)$ $5$ $C$ compound	$(3)$ Citric acid
$(d)$ $3$ $C$ compound	$(4)$ $\alpha$-Ketoglutaric acid
	$(5)$ Malic acid

Krebs' cycle was discovered by Krebs in pigeon muscles in $1940$. Which step is called gateway step/link reaction/transition reaction in respiration?

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?