The krebs cycle completes the energyyielding oxidation of organic molecules. A true b false 18 humans and bacteria share the following metabolic features. Jun 10, 2019 oxygen is the final electron acceptor, no part of the process from the krebs cycle through the electron transport chain can happen without oxygen. Difference between krebs cycle and electron transport chain citric acid vs etc difference between citric acid cycle and electron transport chain cellular respiration is a catabolic process where respiratory substrates like glucose is broken down or oxidised to form carbon dioxide and water with release of energy as atp.
In the cytosol cytoplasm in which part of the cell do the chemical reactions of the krebs cycle occur. Jun 14, 2012 the krebs cycle occurs in the matrix of the mitochondria. Explain how highenergy electrons are used by the electron transport chain. At the end of glycolysis, how much of the chemical energy in glucose is still unused. These reactions occur in the inner mitochondrial membrane called the cristae. Section 92 the krebs cycle and electron transport quizlet. The acetyl group of acetyl coa joins the cycle by combining with oxaloacetate, forming citrate. How are highenergy electrons used by the electron transport chain.
May, 2020 electron transport from the molecules of nadh and fadh 2 made from glycolysis, the transformation of pyruvate, and the krebs cycle creates as many as 32 more atp molecules. Glycolysis occurs in the cytosol, but the krebs cycle and electron transport chain occur inside the mitochondria. What are the 3 phases of the cellular respiration process. The krebs cycle or citric acid cycle is a series of enzyme catalysed reactions occurring in the mitochondrial matrix, where acetylcoa is oxidised to form carbon dioxide and coenzymes are reduced, which generate atp in the electron transport chain. The nadh and fadh 2 produced by the cycle relay electrons extracted from food to the electron transport chain. Krebs cycle occurs in the matrix of the mitochondria oxygen o. Section 92 the krebs cycle and electron transport pages 226232 key concepts what happens during the krebs cycle. The conversion of pyruvate to acetyl coa for entry into the krebs cycle 2 nadhs are generated. Start studying section 92 the krebs cycle and electron transport.
The krebs cycle proper in the krebs cycle, all of carbons, hydrogens, and oxygeng in pyruvate end up as co 2 and h 2 o. Glycolysis, the krebs cycle, and the electron transport chain make up. Chain mitochondrion figure 92 cellular respiration. Electron carriers are used to transport the electrons from chlorophyll to other molecules during photosynthesis. Fill section 9 2 the krebs cycle and electron transport answer key, edit online. Section 92 the krebs cycle and electron transport pages 226232 9. All seven pages taped together, depicts a cross section through a cell. I can explain how electron transport chain is used to create atp.
Why are the components of the electron transport chain. Section 9 2 the krebs cycle and electron transport pages 226232 key concepts what happens during the krebs cycle. How many atp molecules are formed during the krebs cycle. Athletes get the energy they need from the breakdown of glucose. This is the path that is taken when oxygen is present. The krebs cycle plus the conversion of pyruvate produces 2 atps, 8 nadhs, and 2fadh 2 s per glucose molecule. Krebs cycle, when one carbon atom from pyruvic acid becomes part of a molecule of carbon dioxide. It also explains how highenergy electrons are used during the third stage, called electron transport. Electron transport and atp synthesis the electron transport chain uses the highenergy electrons produced by the krebs cycle to move hydrogen ions from one side ofthe inner membrane to the other. Identify how much atp cellular respiration generates. Where do the kreb cycle and electron transport chain take place. The krebs cycle has eight steps, each catalyzed by a specific enzyme. The inner mitochondrial membrane couples electron transport to atp. The krebs cycle and electron transport take place inside the mitochondria.
If oxygen is present, glycolysis is followed by the krebs cycle and the electron transport chain. Krebs cycle carry energy to the electron transport chain to make more atp this requires oxygen. Complete the diagram by writing on the lines provided the names and numbers of molecules used and produced during glycolysis. Therefore, a total of up to 36 molecules of atp can be made from just one molecule of glucose in the process of cellular respiration. This section describes what happens during the second stage of cellular respiration. Also produces 2 atps nadh and fadh2 serve as electron carriers to move energy to the next stage of respiration. Uses the electron carriers nadh from glycolysis and krebs, along with the fadh 2 to change adp into atp in the electron transport chain.
The totals together, glycolysis, the krebs cycle, and the electron transport chain generate about 36 molecules of atp per molecule of glucose. Section 92 the krebs cycle and electron transport pages 226 232 this section describes what happens during the second stage of cellular respiration, called the krebs cycle. Respiration involves glycolysis, the krebs cycle, and electron transport. Section 9 2 the krebs cycle and electron transport chain the kreb cycle the second stage of respiration pyruvic acid from glycolysis is broken down into co2. The next seven steps decompose the citrate back to oxaloacetate, making the process a cycle. Section 9 2 the krebs cycle and electron transport answer. Section 92 the krebs cycle and electron transport pages 226232.
Cellular respiration and fermentation chapter test a. Acetylcoa then adds the 2carbon acetyl group to a 4 carbon compound. Reading skill practice section 92 the krebs cycle and electron. Where in the cell does the glycolysis part of cellular. Difference between krebs cycle and electron transport chain. Reading skill practice section 92 the krebs cycle and. The krebs cycle completes the energyyielding oxidation of organic. Chapter 9 cellular respiration, te scarsdale public schools. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Mar 19, 2009 section 92 the krebs cycle and electron transport pages 226232 this section describes what happens during the second stage of cellular respiration, called the krebs cycle. Section 92 the krebs cycle and electron transport flashcards.
On average, how many atp molecules are produced as each pair of highenergy electrons moves down the electron transport chain. Glycolysis harvests chemical energy by oxidizing glucose to pyruvate. Section 92 the krebs cycle and electron transport pages 226232 this section describes what happens during the second stage of cellular respiration, called the krebs cycle. The starting substance of the krebs cycle, which is regenerated at the end of the cycle, is a. Krebs cycle or the citric acid cycle and the respiratory chain or electron transport chain or oxidative phosphorylation doorsteptutor material for ugc is prepared by worlds top subject experts. Glycolysis, krebs cycle, and other energyreleasing pathways. The nadh and fadh 2 produced by the cycle relay electrons extracted from food to the. Dec 14, 2020 the electron transport chain and oxidative phosphorylation produce the majority of atp. What happens to the oxygen that is used in cellular respiration. In the presence of oxygen, how is the pyruvic acid produced in glycolysis is used.
Figure 92 cellular respiration is the process that releases energy by breaking down food molecules in the presence of oxygen. Assignment on how the krebs cycle and the electron transport. Assignment on how one sugar molecule goes through 1 glycolysis, 2 the krebs cycle, and 3 the electron transport chain to make atp betsy eapen odessa college, department of microbiology we got most of the energy from the food we eat to function our daily activity. 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 lot of atp.
Some of the worksheets for this concept are the krebs cycle, krebs cycle work, 92 the krebs cycle and electron transport, biology 1 work ii, glycolysis krebs cycle and other energy releasing pathways, section 92 the krebs cycle and electron transport, glycolytic pathway, seneca valley school district overview. In which part of the cell do the chemical reactions of glycolysis occur. Krebs cycle and electron transport take place inside the mitochondria. Sign, fax and printable from pc, ipad, tablet or mobile with pdffiller instantly. The high energy electrons are passed from one carrier to. I can describe the overall process of the krebs cycle. The electron carriers produced during glycolysis and the krebs cycle bring highenergy electrons to the electron transport chain. A glycolysis b the krebs cycle c the electron transport chain d fermentation 69. Ideal for senior biology students, honorsap biology students, and college biology students. During the eight steps of the krebs cycle, undergoes a number of reactions, releasing and in a number of steps. Start studying section 9 2 the krebs cycle and electron transport.
While the krebs cycle produces the three things above, the bulk of the atp will be produced in the electron transport stage from what two molecules made during the cycle. Section 92 the krebs cycle and electron transport chain the kreb cycle the second stage of respiration pyruvic acid from glycolysis is broken down into co2. Which of the following pass highenergy electrons to the electron transport chain. A pyruvate transporter in the imm enables the threecarbon product of glycolysis to pass through. Section 9 2 the krebs cycle and electron transport answer key.
Krebs cycle definition, products and location biology. At the end of glycolysis, how much of the chemical energy in. What happens to pyruvic acid during the krebs cycle. What is the energy of the highenergy electrons used for every time 2 highenergy electrons move down the electron transport chain.
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