(ECE) ELECTRON TRANSPORT CHAIN
Cellular respiration is known to be one of the most majestic and elegant metabolic pathways found on the earth. It comprises of 3 stages:
•ETC (Electron Transport Chain)
Throughout the cycle, ATP is generated in all the three phases of cellular respiration. However, the maximum ATP is generated in the ETC process.
Cellular respiration refers to the series of metabolic processes as well as reactions which occurs within the cells of the organisms. This process focuses on the conversion of the biochemical energy from the nutrients into the adenosine triphosphate and finally secrete out the waste products.
During this, a molecule of glucose is slowly broken down into the water and carbon dioxide. Some ATP or adenosine triphosphate is generated directly in the reactions which converts the glucose molecule. Oxidative phosphorylation is basically powered by the movement of the electron via the ETC which is a row of proteins pierced in the inner membrane of the mitochondria.
1.The process begins with the glycolysis. In this, the six-carbon sugar called glucose undergoes a row of chemical reactions and in the end, gets transformed into the two molecule of pyruvate which is a three-carbon molecule. During this, ATP is produced and NAD+ is converted into NADH. The process of glycolysis generates a net gain of two molecules of pyruvate, two molecules of ATP, and two NADH.
2.The second phase is the pyruvate oxidation wherein each molecule of pyruvate goes into the mitochondrial matrix and gets converted into the 2-carbon molecule and then binds with the coenzyme A which is called acetyl CoA. During this, NADH is generated while carbon dioxide is released. This stage generates two molecules of ATP for every molecule of glucose.
3.The third phase is the Krebs cycle or citric acid cycle wherein the acetyl CoA combines with the four-carbon molecule and undergoes a series of reactions, finally, generating four carbon starting molecule, NADH, ATP, and FADH2. The last phase is the ETC or ETC wherein NADH and FADH2 deposit their electrons and gets back into their previous forms like NAD+ and FAD.
The electrons move down the chain and release the energy which is used to pump out the protons of the matrix, thereby forming a gradient. The protons then move back into the matrix via the enzyme called ATP synthase which produces ATP. In the end, the oxygen accepts the electrons and then consumes the protons in order to form water. Finally, thirty eight molecules of ATP are formed, two glycolysis, two from Krebs cycle, and around thirty four from the ETC.
1. Learn more about photosynthesis
2.Learn more about plants
3.Learn more about respiration
Grade: High school
Chapter: Cellular respiration
Cellular respiration, glycolysis, Krebs cycle, ETC, citric acid cycle, adenosine triphosphate.
D. electron transport chain?
During Cellular respiration most ATP is produced the electron transport chain which is the last stage of cellular respiration.Further Explanation Cellular respiration is the process of by which living organisms use nutrients or food substances to generate energy in the form of ATP that is required to drive cellular processes. Cellular respiration takes place in an organelle known as mitochondrion which is known as the powerhouse of the cell. Cellular respiration takes place in three stages; glycolysis, Kreb's cycle and electron transport. GlycolysisIt is the first stage of aerobic respiration where an organic molecule such as glucose is broken down to form 2 molecules of Acetyl-CoA and net production of 2 ATP molecules. Each glucose molecule yields two molecules of ATP and two molecules of Acetyl-CoA. Kerb's cycleIt is the second phase of aerobic respiration that involves a series of reactions catalyzed by various enzymes. Acetyl-CoA from glycolysis undergoes a series of reaction to produce six molecules of NADH, two molecules of FADH2, together with carbon dioxide and two molecules of ATP. Electron transport chainIt is the final stage of Aerobic respiration, where the six molecules of NADH and two molecules of FADH from Kreb's cycle are used to generate energy in form of ATP. This stage generates 34 molecules of ATP.
Therefore, the electron transport chain is the stage of cellular respiration that yields the most energy in the form of ATP.
Keywords: cellular respiration, ATP, energyLearn more about: Aerobic respiration: Anaerobic respiration: Stages of cellular respiration: Electron transport chain:
Level: High school
Topic: Cellular respiration
In cellular respiration, the electron transport stage is when most adenosine triphosphate (ATP) is produced. Electron transport is the third stage in cellular respiration.
Cellular respiration involves a series of complex reactions. The first phase of cellular respiration is glycolysis, which involves splitting glucose. This phase is carried out in several steps. The end result is the production of pyruvic acid. After pyruvic acid is produced, the Krebs cycle begins. The Krebs cycle, which is the second phase of cellular respiration, is sometimes referred to as the citric acid cycle. The Krebs cycle first produces citric acid, and it produces carbon dioxide as an end product. Electron transport is the last stage of aerobic respiration in cellular respiration. It results in the production of adenosine triphosphate, or ATP. ATP is a molecule that supports a variety of life functions. It is found in the nucleoplasm and cytoplasm of all cells, and helps organisms perform physiological functions. During anaerobic respiration, ATP is synthesized through glycolysis. In aerobic production, ATP is produced by mitochondria in addition to glycolysis.
In cellular respiration, the electron transport stage is when most ATP (adenosine triphosphate) is produced. Electron transport is the third stage of cellular respiration. The first stage is glycolysis, then it comes with the Krebs cycle, then the electron transport stage which is also the last stage.
In short, Your Answer would be Option D
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