In this video, we're going to take a look at the phases of glycolysis. Now, firstly, we're going to say that glycolysis is a linear catabolic pathway that consists of two phases. Now, here we're going to say Phase A is our energy-consuming phase. Here we have Phosphorylation and Bond Cleavage, a reaction that splits a glucose molecule. Remember, glucose molecules have six carbons. Now, here it's going to produce two molecules of Glyceraldehyde 3-Phosphate, which we will abbreviate as G3P. Because it's energy-consuming, it has to consume a high-energy molecule in the form of ATP. So here we have our glucose which is our six carbons. ATP is invested into this process; it's an energy-consuming one. Doing that helps us to split our glucose into two Glyceraldehyde 3-Phosphates.

Now, in the energy-producing phase, we're going to say that we have oxidation and dephosphorylation; it converts our Glyceraldehyde 3-Phosphate to Pyruvate. Remember, oxidation reactions here will produce NADH and ATP. So, this is the energy-producing phase of glycolysis. So here we have our two Glyceraldehyde 3-Phosphates. In the process of oxidation, we're going to create NADH, ATP, and as a result, our Glyceraldehyde 3-Phosphate is converted into two pyruvate molecules. Right? So just think of glycolysis broken down into these two simple phases at this point.