Font Paragraph 3 wnar is pyruvate convertea unaer anaerooic conditions Styles r
ID: 3505358 • Letter: F
Question
Font Paragraph 3 wnar is pyruvate convertea unaer anaerooic conditions Styles r 4) Pyruvate is converted to Acetyl-CoA before entering the Krebs cycle stage 5) There are 2 coenzymes acting as electron acceptors in Cellular respiration. What are their names? Match the following stages to their correct descriptions Krebs cycle electron transport 6) Which stage forms water 7) Which stage produces carbon dioxide 8) Which stage gives a net yield of 2 ATP molecules 9) Which stage utilizes proton pumps and ATP synthase 10)Which stage does not require oxygenGLYCOLYSIS 6 VBNIMExplanation / Answer
3) Pyruvate is converted to lactic acid under anaerobic condition. One molecule of pyruvate is converted by lactate dehydrogenase to one molecule of lactic acid by lactate dehydrogenase. In this process, NADH is oxidized to NAD+. This is usually seen in muscle during exercise. There is no release of gas.
In anaerobic fermentation by yeast, pyruvate is converted to one molecule each of ethanol and carbon dioxide. NAH is oxidized to regenerate NAD+. Pyruvate releases a two-carbon compound called acetaldehyde. Acetaldehyde is reduced by NADH to form ethanol.
4. During glycolysis, one molecule of glucose is broken down to two molecules of pyruvate. Each pyruvate is then converted to acetyl CoA by pyruvate dehydrogenase by addition of CoASH. This acetyl CoA then enters the Krebs cycle via citrate.
Right choice is acetyl CoA.
5. The two coenzymes that act as electron acceptors are NAD and FADH2. NAD accepts two electrons and an H+ ion to form NADH. FAD+ accepts two electrons and two H+ ion to form FADH2. Enzymes that involve these coenzymes are known as dehydrogenases. These include isocitrate dehydrogenase, alpha keto glutarate dehydrogenase, succinate dehydrogenase, and malate dehydrogenase.
6. Water is formed in electron transport chain. The hydrogen ions from the coenzymes reacts with oxygen from cell to form water. In this process, reducing power is regenerated.
Right option: Electron transport chain.
7. Carbon dioxide is produced during the Krebs cycle. Pyruvate is broken down by pyruvate dehydrogenase to form carbon dioxide and acetyl CoA. Two carbon dioxide are produced per glucose molecule.
Right option: Krebs cycle.
8. Glycolysis yield net 2 ATP per molecule of glucose. 4 ATP molecules are produced when 1, 3 Bisphosphoglycerate is converted to 3 PGA and phosphoenolpyruvate is converted to pyruvate. Two ATP molecules are utilized glucose is converted to glucose-6-phosphate and fructose-6 phosphate is converted to fructose 1,6-bisphosphate. Net ATP=4-2=2
Right option: Glycolysis
9) The electron transport chain utilizes the proton pump and ATP synthase in the inner mitochondrial membrane. The proton pump transport Hydrogen ions across the membrane. These ion react with oxygen to form water. The ATP synthase enzyme produces ATP from ADP and Pi.
Right option : Electron transport chain.
10. Glycolysis is common between aerobic and anaerobic respiration as it takes place in both types of system. Hence, no oxygen is utilized in glycolysis. Krebs cycle and electron transport chain cannot function in absence of oxygen.
Right option: Glycolysis.