Cellular Respiration In Yeast Research Paper
Saccharomyces Cerevisiae (yeast)is a single cell eukaryotic organism that is a fungi. It digests food to obtain energy for growth and gets it mostly from sugars like sucrose, fructose and glucose and maltose.
When sugar is present, yeast conducts fermentation to produce alcohol and carbon dioxide by creating a chemical energy.In yeast, high sugar concentrations and high specific growth rates trigger alcoholic fermentation, even under fully aerobic conditions. It is commonly used to leaven bread, mold blue cheese to make it ripe, ferment alcohol, and is used in the molds that produce antibiotics for veterinary and medical use. In bread baking the sugars from the flour or from the added sugar are fermented by the yeast, because the dough is
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Figure4 - the chemical structure of sucrose. Figure5 - the chemical structure of lactose.
Cellular respiration is when food molecules like glucose are oxidised to form carbon dioxide and water. Adenosine triphosphate is created by a catabolic pathway to be used by the cell. Cellular respiration happens in both eukaryotic and prokaryotic cells. The three main stages of cellular respiration:
1.Glycolysis - this is the splitting of sugars. It has glucose, a 6 carbon sugar is separated into 2 molecules of a three carbon sugar. This happens in the cytoplasm of the cell. During the process, two molecules of ATP, and of pyruvic acid and 2 electron carrying molecules of NADH are created. It can also happen with or without oxygen.
2. The Krebs cycle - It starts when 2 molecules from the 3 carbon sugar made in glycolysis are created into a different compound. It is a central metabolic pathway with aerobic organisms that consists of a series of 9 reactions that ocur in mitochondrion. It also occurs when there is oxygen present.
Acetyl CoA+3NAD+FAD+ADP+HP04-2 2CO2+CoA+3NADH+ +FADH+
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It is the only part of glucose metabolism that needs oxygen. There are electrons in the membrane of the mitochondria in the eukaryotic cells that are passed rapidly from one part to the next, then to endpoint where electrons reduce the oxygen to produce
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