How many reactions in cellular respiration

Aerobic Respiration. Source: Wikimedia Aerobic respiration is the type of cellular respiration that requires the presence of oxygen. Among all the types of cellular respiration it is the most efficient. Plants and animals carry out this kind of respiration; plants obtain the precursor molecules from photosynthesis while animals obtain them from the food they eat i.

May range from 34 to 38 net ATP. What is the role of Oxygen in the process? Oxygen is an essential molecule in cellular respiration. But where does it exactly fit in the picture? Basically, oxygen can be found at the end of the ETC during aerobic respiration where it accepts electrons while picking up protons in order to produce water molecules.

When oxygen levels are depleted, electrons will be simply dispersed and the electron transport chain will discontinue. Of course no ATP will be produced, causing the cease of some physiological functions in the cell. Lactic Acid Fermentation Source: Wikimedia Alternatively during a depletion of oxygen, the cell may undergo a process called fermentation and utilize an alternative pathway at the end of glycolysis.

And instead of oxidative phosphorylation, it uses substrate level phosphorylation that does not require oxygen in the process this is not to be confused with anaerobic respiration. Anaerobic Respiration. Anaeribic Respiration Source: Wikimedia This process occurs just like the typical cellular reaction same glycolytic and Krebs cycle pathway but only differs because it is used by organisms like bacteria and archaea where oxygen is not the final electron acceptor.

Rather, these organisms use sulfates or nitrates instead. It is important to note that while both fermentation and anaerobic happen in the absence of oxygen, the former is only an alternative and extends glycolysis to produce energy whereas the latter uses other molecules to complete the cycle as the organism will die in the presence of oxygen.

Unlike aerobic respiration that occurs in the mitochondria, aerobic respiration happens in the cytosol. The process of anaerobic respiration generates only 2 ATP per glucose molecule. Key References. Accessed December 05, Through a series of reactions, the "high energy" electrons generated in the citric acid cycle are passed to oxygen. In the process, a chemical and electrical gradient is formed across the inner mitochondrial membrane as hydrogen ions are pumped out of the mitochondrial matrix and into the inner membrane space.

ATP is ultimately produced by oxidative phosphorylation—the process by which enzymes in the cell oxidize nutrients.

Most ATP generation occurs during the electron transport chain and oxidative phosphorylation stage of cellular respiration. Actively scan device characteristics for identification. Use precise geolocation data. Select personalised content. Create a personalised content profile.

Measure ad performance. Select basic ads. Create a personalised ads profile. Select personalised ads. Apply market research to generate audience insights.

Measure content performance. Develop and improve products. List of Partners vendors. Share Flipboard Email. Cellular respiration is a cell's way of obtaining energy, so it's a process you depend on in order to live. You missed some questions, so you might want to review the details of cellular respiration, especially the Krebs or citric acid cycle and glycolysis. If you're ready for another quiz, see how much you know about everyday chemistry. Great job!

You know a lot about cellular respiration and how it works. If you a bit uncertain about details, you might wish to review the citric acid cycle Krebs cycle or TCA cycle , glycolysis, and fermentation.

Of you'd like to try another chemistry quiz, see how much you know about DNA. Actively scan device characteristics for identification. Use precise geolocation data.

Select personalised content. Create a personalised content profile. Measure ad performance. Select basic ads. Create a personalised ads profile. Select personalised ads. Apply market research to generate audience insights.