In this example question, it asks how many ATP and how many NADH molecules are yielded by glycolysis? Now, remember with glycolysis, we have Phase A, which is our energy-consuming phase. There, we have our glucose, and we're going to say in reactions 1 and 3, we consume an ATP molecule. So that means we're going to consume 2 ATP in Phase A. But then, for Phase B, okay, so this is A, and then for Phase B, we're going to say this is the energy-producing stage, and in Phase B, it's reactions 7 plus 10, where we create ATP. Here we're going to create 2 ATP, but remember, we have 2 pyruvate molecules involved here from the 2 glyceraldehyde 3-phosphates. So, we'd multiply this number times 2. So it's 4 ATPs that are being created within Phase B.

But here we're talking about the net. When we're talking about yields, here we're talking about what's the net value of ATP created. We consumed 2 and made 4. So, really, it's 2 ATPs, our net value.

Here, we'd say for NADH molecules, this happens under Phase B as well. It happens in reaction 6. And we're going to say reaction 6, we make 1 NADH molecule, but then we have to remember to multiply it by 2 since we're dealing with 2 glyceraldehyde 3-phosphates. So the net would be 2 NADH molecules. Then, pyruvate oxidation yields what? Well, here we have 2 pyruvates. Each pyruvate creates 1 NADH, and since there are 2 of them, that means overall we yield 2 NADH molecules. Right? So this is what we'd say: Glycolysis yields 2 net ATPs, 2 NADH molecules, and pyruvate oxidation yields 2 NADH molecules. These will be our answers for the following example question.