So here we have an example problem that's asking how many turns of the Krebs cycle are needed to completely break down just one molecule of glucose. And we've got these 5 potential answer options down below. And so what we need to recall from our previous lesson videos is that for every one molecule of glucose, it's going to undergo glycolysis. And so the one molecule of glucose will undergo glycolysis and be broken up into 2 molecules of pyruvate. And then those 2 molecules of pyruvate undergo pyruvate oxidation and get converted into, Acetyl CoA molecules.

And so we have 2 Acetyl CoA molecules, and each of those acetyl co a molecules has to undergo the Krebs Cycle revolution. And so what that means is that from every one molecule of glucose, there's actually going to be 2 turns or revolutions of the Krebs Cycle. One for each of the acetyl co a molecules that are produced. And so the correct answer here for this example problem is going to be option a, which says 2 turns of the Krebs cycle are needed to completely break down just one molecule of glucose. And so this here concludes this example problem and I'll see you all in our next video.