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- Hey, Melissa! How are you? You haven't come to school for a few days now...
- Kate! Hey! I'm doing good, thank you. I just caught a cold, so decided not to go to school. What have I missed?
- Not anything I can think of...Actually, you did! You missed the whole section on the Cellular Respiration in Biology We have a test on it tomorrow. 
- Ha?! Oh my God, I missed the whole section, how will I be able to do the test tomorrow? Is Cellular Resp...Is the section hard? 
- Hey, don't stress out. I understood the whole section, so if you want I can tell you about it. Would you like to come to my place to study?
- That would be great! It is so kind of Kate. Thank you so much!
- Cellular Respiration is a process in which organisms break down the food and nutrients in order to get energy. Cellular Respiration has 3 stages They are, going in order, first stage is glycolysis, second stage Kreb's cycle and the last stage is Oxidative Phosphorylation. Glycolysis is a process of breaking down glucose in the cytoplasm. If we analyze the process of Glycolysis deeper, in it one glucose is converted into two pyruvates. This process can be easily achieved without oxygen. 
- Glycolysis is the first stage of Cellular Respiration. It is a process of breaking down glucose in the cytoplasm. There are three reactions of Glycolysis, priming reaction, cleavage reaction and energy harvesting reaction. With these reactions occurying in Glycolysis, 2 ATP are consumed and 4ATP are produced. 
- Wow! I get it!
- In the priming reaction, 2 phosphate groups with high amounts of energy are added to 6 carbon glucose molecule. In the end of this reaction, we have 2 phosphate sugar molecules and 6 carbon. In cleavage reaction, 6 carbon and 2 phosphate sugar molecules are split into 2. Energy- Harvesting is the last reaction in Glycolysis. In it, the two three-carbon sugar phosphate are turned into pyruvate. The Hydrogen is harvested from NADH and forms 2 new ATP molecules.
- That's cool!
- The next stage of the Cellular Respiration is the Kreb's Cycle. In this stage oxygen is required. In this process, the pyruvate releases carbon dioxide and when it's gone the 2 carbon atoms left over join with CoA. This results in Acetyl-CoA being created  that releases high energy electrons which attaches to NAD, which later creates NADH. In Kreb's Cycle 2 ATP and 2 FADH2 molecules are produced. 
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