Glycolysis Krebs Cycle And Electron Transport Chain Pdf

glycolysis krebs cycle and electron transport chain pdf

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Krebs cycle importance

In eukaryotic cells, the pyruvate molecules produced at the end of glycolysis are transported into mitochondria, which are sites of cellular respiration. If oxygen is available, aerobic respiration will go forward. In mitochondria, pyruvate will be transformed into a two-carbon acetyl group by removing a molecule of carbon dioxide that will be picked up by a carrier compound called coenzyme A CoA , which is made from vitamin B 5. The resulting compound is called acetyl CoA. Figure 4.

The TCA Cycle

The Krebs cycle is the second of three stages of cellular respiration, in which glucose, fatty acids and certain amino acids, the so-called fuel molecules , are oxidized see Figure. The oxidation of these molecules is primarily used to transform the energy contained in these molecules into ATP. ATP provides for example energy for muscle contractions and can therefore be referred to as "energy currency" of the cells. Before the fuel molecules can be inserted in the Krebs Cycle, they must first all be converted into acetyl-CoA. Looking at the path of a nutrient, such as glucose, the oxidation of the molecule takes place in the glycolysis. The product of the glycolysis is pyruvate. In a further reaction, which is catalyzed by the enzyme complex pyruvate dehydrogenase, acetyl-CoA is formed out of pyruvate, which can be introduced into the citric acid cycle or Krebs Cycle.


Electron carriers such as NADH produced during glycolysis and the Krebs cycle pass their electrons to the electron transport chain, which results in synthesis of a​.


Mitochondrial TCA cycle metabolites control physiology and disease

Life is possible only if molecules and cells remain organized. Organization requires energy, as governed by the laws of thermodynamics. Just about anything a living organism does requires energy. We most often think of energy as food or calories.

Learn vocabulary, terms, and more with flashcards, games, and other study tools. The differences between reduction and There is also a handy acronym at the end that helps students to remember the four stages of glycolysis. Key stage: KS 3. The anaerobic process of splitting glucose I.

You have just read about two pathways in cellular respiration—glycolysis and the citric acid cycle—that generate ATP. However, most of the ATP generated during the aerobic catabolism of glucose is not generated directly from these pathways. Rather, it is derived from a process that begins with moving electrons through a series of electron transporters that undergo redox reactions: the electron transport chain. This causes hydrogen ions to accumulate within the matrix space. Therefore, a concentration gradient forms in which hydrogen ions diffuse out of the matrix space by passing through ATP synthase.

In this article we will outline the steps and regulation of this essential part of cellular physiology. Prior to the TCA cycle, glycolysis has occurred. Acetyl-coA is the intermediate that enters the TCA cycle.

In eukaryotes , this takes place inside mitochondria. Almost all aerobic organisms carry out oxidative phosphorylation. This pathway is so pervasive because it releases more energy than alternative fermentation processes such as anaerobic glycolysis.

Oxidative phosphorylation

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