We now take a look at phase b of glycolysis. Phase b of glycolysis consists of its last five reactions. It converts 2 G3P molecules (Glyceraldehyde 3-Phosphates) into 2 pyruvates, extracting energy in the process. Here, it produces 2 NADH and 4 ATP molecules. We also say that reaction 10, the last reaction of phase b, is irreversible. So we've gone through phase a, all here in red, which leads us into the blue portion which is phase b. Here, we have our inorganic phosphate being incorporated to create 1,3-bisphosphoglycerate, and we have the production of NADH in a process. We created a high-energy molecule in the form of NADH.
We then have a reversible reaction 7, where our 1,3-bisphosphoglycerate changes into 3-phosphoglycerate. We've lost a phosphate group so that we can give it to ADP to convert it into ATP. So, we've just created ATP. In reaction 8, we've removed—well, we've switched the position of our phosphate group—to transform 3-phosphoglycerate into 2-phosphoglycerate. Then, due to the loss of water in reaction 9, we have the creation of phosphoenolpyruvate. Now we'll go in-depth in terms of each of these. We'll learn steps to help us memorize the different products and at which steps they are produced.
I know it's a lot, so don't feel overwhelmed because it is indeed a lot of reactions, but we're going to learn summaries on how to basically remember this massive amount of information. And then, finally, here, we have the removal of the last inorganic phosphate and the creation of ATP again to give us, at the end, pyruvate. Remember, we have 2 G3P molecules so this happens twice. So here we're making 1 NADH and then 2 ATP, and it does it again to give us another NADH and 2 more ATP. So that's how we come up with a total of 2 NADHs and 4 ATP molecules from phase b of glycolysis. Right. This just gives us an overall view of what's happening within this phase of glycolysis, and we're about to go more in-depth with each one of these reactions.
