What are the complete balanced equation for cellular ...

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What are the complete balanced equation for cellular respiration

Cellular respiration is the process by which organisms convert the biochemical energy of nutrients into ATP. This process breaks down glucose into six carbon dioxide molecules and twelve water molecules. The overall chemical equation for aerobic respiration is C6H12O6 + 6O2 + 6H2O 12H2O + 6CO2 + 36/38ATP and the chemical equations for anaerobic respiration are C6H12O6 2C2H5OH + 2CO2 + 2ATP (for ethanol fermentation) and C6H12O6 2C3H6O3 + 2ATP (for lactic acid fermentation). The cellular respiration is a catabolic process which breaks down large molecules into small molecules. The energy released during cellular respiration is used in the synthesis of ATP. Various sugars, amino acids, and fatty acids can be used as the substrate for cellular respiration. Key Areas Covered 1. What is Cellular Respiration ? Definition, Facts, types 2. What is the Chemical Equation for Cellular Respiration ? Aerobic Respiration, Anaerobic Respiration Key Terms: Aerobic Respiration, Anaerobic Respiration, ATP, Cellular Respiration, Glucose What is Cellular Respiration Cellular respiration is a set of chemical reactions involved in the breakdown of nutrients into carbon dioxide and water, producing ATP. ATP is the main energy currency of the cell. Cellular respiration occurs within almost all organisms on the earth. Nutrients such as carbohydrates, proteins, and fatty acids are converted into glucose and used in the cellular respiration. There are two types of cellular respiration as aerobic respiration and anaerobic respiration. Final electron acceptor of aerobic respiration is molecular oxygen which is an inorganic compound in anaerobic respiration. The overall process of cellular respiration is shown in figure 1. Figure 1: Cellular Respiration The chemical equations for all types of cellular respiration are described below. Aerobic Respiration Aerobic respiration is the most efficient type of cellular respiration, which occurs in the presence of oxygen. The three steps of aerobic respiration are glycolysis, Krebs cycle, and electron transport chain. 1. Glycolysis Glycolysis is the first step of aerobic respiration, which occurs in the cytoplasm. Two pyruvate molecules are produced from one glucose molecule during glycolysis. The chemical equation for glycolysis is, Glucose + 2NAD+ 2Pi + 2ADP 2Pyruvate + 2NADH + 2ATP + 2H+ + 2H2O + Heat These pyruvic acid molecules react with coenzyme-A to form acetyl-CoA. Pyruvate + 2NAD+ + CoA Acetyl CoA + NADH + CO2 + H+ 2. Krebs Cycle Acetyl CoA is completely broken down into carbon dioxide during Krebs cycle. Acetyl CoA + 3NAD+ Q + GDP + Pi + 2H2O CoA-SH + 3NADH + 3H+ +QH2 + GTP + 2CO2 3. Electron Transport Chain Coenzymes made by the above two processes are reduced back by oxidative phosphorylation. The released energy is stored in ATP. The overall chemical equation for aerobic respiration is shown below. C6H12O6 + 6O2 + 6H2O 12H2O + 6CO2 + 36/38ATP Anaerobic Respiration Anaerobic respiration is a type of cellular respiration that occurs in the absence of oxygen. The main type of anaerobic respiration is fermentation. Two types of fermentation can be identified: ethanol fermentation and lactic acid fermentation. The first steps of both fermentation methods are the glycolysis. The balanced chemical equations for both ethanol fermentation and lactic acid fermentation are shown below. Ethanol Fermentation C6H12O6 2C2H5OH + 2CO2 + 2ATP Lactic Acid Fermentation C6H12O6 2C3H6O3 + 2ATP Conclusion During cellular respiration, one glucose molecule is broken down into six carbon dioxide molecules and twelve water molecules. The released energy is used in the production of ATP. Reference: 1. "Steps of Cellular Respiration." Khan Academy, Available here. Image Courtesy: 1. "CellRespiration" By RegisFrey ? Own work (CC BY-SA 3.0) via Commons Wikimedia Cellular respiration is the process through which cells convert sugars into energy. To create ATP and other forms of energy to power cellular reactions, cells require fuel and an electron acceptor which drives the chemical process of turning energy into a useable form. Eukaryotes, including all multicellular organisms and some single-celled organisms, use aerobic respiration to produce energy. Aerobic respiration uses oxygen ? the most powerful electron acceptor available in nature. Aerobic respiration is an extremely efficient process allows eukaryotes to have complicated life functions and active lifestyles. However, it also means that they require a constant supply of oxygen, or they will be unable to obtain energy to stay alive. Prokaryotic organisms such as bacteria and archaebacteria can use other forms of respiration, which are somewhat less efficient. This allows them to live in environments where eukaryotic organisms could not, because they do not require oxygen. Examples of different pathways for how sugars are broken down by organisms are illustrated below: More detailed articles on aerobic respiration and anaerobic respiration can be found on this site. Here we will give an overview of the different types of cellular respiration. The equation for aerobic respiration shows glucose being combined with oxygen and ADP to produce carbon dioxide, water, and ATP: C6H12O6 (glucose)+ 6O2 + 36 ADP (depleted ATP) + 36 Pi (phosphate groups) 6CO2 + 6H2O + 36 ATP You can see that once it is completely broken down, the carbon molecules of glucose are exhaled as six molecules of carbon dioxide. In lactic acid fermentation, one molecule of glucose is broken down into two molecules of lactic acid. The chemical energy that was stored in the broken glucose bonds is moved into bonds between ADP and a phosphate group. C6H12O6 (glucose) + 2 ADP (depleted ATP) + 2 Pi (phosphate groups) 2 CH3CHOHCOOH (lactic acid) + 2 ATP Alcohol fermentation is similar to lactic acid fermentation in that oxygen is not the final electron acceptor. Here, instead of oxygen, the cell uses a converted form of pyruvate to accept the final electrons. This creates ethyl alcohol, which is what is found in alcoholic beverages. Brewers and distillers use yeast cells to create this alcohol, which are very good at this form of fermentation. C6H12O6 (glucose) + 2 ADP (depleted ATP) + 2 Pi (phosphate groups) 2 C2H5OH (ethyl alcohol) + 2 CO2 + 2 ATP Glycolysis is the only step which is shared by all types of respiration. In glycolysis, a sugar molecule such as glucose is split in half, generating two molecules of ATP. The equation for glycolysis is: C6H12O6 (glucose) + 2 NAD+ + 2 ADP + 2 Pi 2 CH3COCOO- + 2 NADH + 2 ATP + 2 H2O + 2H+ The name "glycolysis" comes from the Greek "glyco," for "sugar" and "lysis" for "to split." This may help you to remember that glycolysis it the process of splitting a sugar. In most pathways, glycolysis starts with glucose, which is then split into two molecules of pyruvic acid. These two molecules of pyruvic acid are then processed further to form different end products, such as ethyl alcohol or lactic acid. Reduction is the next part of the process. In chemical terms, to "reduce" a molecule means to add electrons to it. In the case of lactic acid fermentation, NADH donates an electron to pyruvic acid, resulting in the end products of lactic acid and NAD+. This is helpful to the cell because NAD+ is necessary for glycolysis. In the case of alcoholic fermentation, pyruvic acid undergoes an additional step in which it loses an atom of carbon in the form of CO2. The resulting intermediate molecule, called acetaldehyde, is then reduced to produce NAD+ plus ethyl alcohol. Aerobic respiration takes these processes to another level. Instead of directly reducing intermediates of the Krebs cycle, aerobic respiration uses oxygen as the final electron receptor. But first, the electrons and protons bound to electron carriers (such as NADH), are processed through the electron transport chain. This chain of proteins within the mitochondrial membrane uses the energy from these electrons to pump protons to one side of the membrane. This creates an electromotive force, which is utilized by the protein complex ATP synthase phosphorylate a large number of ATD molecules, creating ATP. The main product of any cellular respiration is the molecule adenosine triphosphate (ATP). This molecule stores the energy released during respiration and allows the cell to transfer this energy to various parts of the cell. ATP is used by a number of cellular components as a source of energy. For example, an enzyme may need energy from ATP to combine two molecules. ATP is also commonly used on transporters, which are proteins that function to move molecules across the cell membrane. Carbon dioxide is a universal product created by cellular respiration. Typically, carbon dioxide is considered a waste product and must be removed. In an aqueous solution, carbon dioxide creates acidic ions. This can drastically lower the pH of the cell, and eventually will cause normal cellular functions to cease. To avoid this, cells must actively expel carbon dioxide. While ATP and carbon dioxide are regularly produced by all forms of cellular respiration, different types of respiration rely on different molecules to be the final acceptors of the electrons used in the process. All cells need to be able to obtain and transport energy to power their life functions. For cells to continue living, they must be able to operate essential machinery, such as pumps in their cell membranes which maintain the cell's internal environment in a way that's suitable for life. The most common "energy currency" of cells is ATP ? a molecule which stores a lot of energy in its phosphate bonds. These bonds can be broken to release that energy and bring about changes to other molecules, such as those needed to power cell membrane pumps. Because ATP is not stable over long periods of time, it is not used for long-term energy storage. Instead, sugars and fats are used as a long-term form of storage, and cells must constantly process those molecules to produce new ATP. This is the process of respiration. The process of aerobic respiration produces a huge amount of ATP from each molecule of sugar. In fact, each molecule of sugar digested by a plant or animal cell yields 36 molecules of ATP! By comparison, fermentation usually only produces 2-4 molecules of ATP. Anaerobic respiration processes used by bacteria and archaebacteria yield smaller amounts of ATP, but they can take place without oxygen. Below, we'll discuss how different types of cellular respiration produce ATP. Eukaryotic organisms perform cellular respiration in their mitochondria ? organelles that are designed to break down sugars and produce ATP very efficiently. Mitochondria are often called "the powerhouse of the cell" because they are able to produce so much ATP! Aerobic respiration is so efficient because oxygen is the most powerful electron acceptor found in nature. Oxygen "loves" electrons ? and its love of electrons "pulls" them through the electron transport chain of the mitochondria. The specialized anatomy of the mitochondria ? which bring together all the necessary reactants for cellular respiration in a small, membrane-bound space within the cell ? also contributes to the high efficiency of aerobic respiration. In the absence of oxygen, most eukaryotic cells can also perform different types of anaerobic respiration, such as lactic acid fermentation. However, these processes do not produce enough ATP to maintain the cell's life functions, and without oxygen, cells will eventually die or cease to function. Fermentation is the name given to many different types of anaerobic respiration, which are performed by different species of bacteria and archaebacteria, and by some eukaryotic cells in the absence of oxygen. These processes can use a variety of electron acceptors and produce a variety of byproducts. A few types of fermentation are: Alcoholic fermentation ? This type of fermentation, performed by yeast cells and some other cells, metabolizes sugar and produces alcohol and carbon dioxide as byproducts. This is why beers are fizzy: during fermentation, their yeasts release both carbon dioxide gas, which forms bubbles and ethyl alcohol. Lactic acid fermentation ? This type of fermentation is performed by human muscle cells in the absence of oxygen, and by some bacteria. Lactic acid fermentation is actually used by humans to make yogurt. To make yogurt, harmless bacteria are grown in milk. The lactic acid produced by these bacteria gives yogurt its distinctive sharp-sour taste and also reacts with milk proteins to create a thick, creamy texture. Proprionic acid fermentation ? This type of fermentation is performed by some bacteria, and is used to make swiss cheese. Proprionic acid is responsible for the distinctive sharp, nutty flavor of Swiss cheese. The gas bubbles created by these bacteria are responsible for the holes found in the cheese. Acetogenesis ? Acetogenesis is a type of fermentation performed by bacteria, which produces acetic acid as its byproduct. Acetic acid is the distinctive ingredient in vinegar which gives it its sharp, sour taste and smell. Interestingly, the bacteria that produce acetic acid use ethyl alcohol as their fuel. This means that to produce vinegar, a sugar-containing solution must be first fermented with yeast to produce alcohol, then fermented again with bacteria that turn the alcohol into acetic acid! Methanogenesis is a unique type of anaerobic respiration that can only be performed by archaebacteria. In methanogenesis, a fuel source carbohydrate is broken down to produce carbon dioxide and methane. Methanogenesis is performed by some symbiotic bacteria in the digestive tracts of humans, cows, and some other animals. Some of these bacteria are able to digest cellulose, a sugar found in plants that cannot be broken down through cellular respiration. Symbiotic bacteria allow cows and other animals to obtain some energy from these otherwise undigestible sugars!

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