Question

What stage of respiration immediately follows the process depicted below?

Two pyruvate molecules undergo a chemical reaction, combining with coenzyme A to form two acetyl-CoA molecules. Two carbon dioxide molecules and two NADH molecules are formed as a result of this process.

Answer 1

The process described here is the pyruvate dehydrogenase complex (PDC) which is:
2, 3-C Pyruvate + coenzyme A + 2NAD+ --> Acetyl CoA + 2NADH + 2CO2

Thereafter, the process after PDC is Kreb's cycle or citric acid cycle:
Oxaloacetate+Acetyl CoA-->citric acid-->isocitrate
Isocitrate+2NAD+ --> 2NADH + 2CO2
GTP+ADP (REDOX REACTION) --> GDP + ATP
FAD-->FADH2 (REDUCTION)
NAD-->NADH (REDUCTION)--->Oxaloacetate

It's a cycle and occurs twice.

So your answer is krebs cycle