The Stages Of Cellular Respiration And Photosynthesis

768 words - 3 pages

The Cellular respiration and photosynthesis form a critical cycle of energy and matter that supports the continued existence of life on earth. Describe the stages of cellular respiration and photosynthesis and their interaction and interdependence including raw materials, products, and amount of ATP or glucose produced during each phase. How is each linked to specific organelles within the eukaryotic cell? What has been the importance and significance of these processes and their cyclic interaction to the evolution and diversity of life?
Respiration consists of a complicated series of chemical reactions. The first step of cellar respiration, called glycolysis, takes place in the cytoplasm. The two main components are oxygen and glucose. Lungs take in the oxygen and the glucose is taken in by eating food. The purpose of glycolysis is to split a glucose molecule into two molecules of pyruvate so that it is small enough to fit into the mitochondria. A C6 or glucose molecules are taken in, and split into two C3 molecules. C3 molecules called pyruvic acid (PA) molecules. Glycolysis results in the production of two ATP’s, two pyruvic acid molecules, and one NADH. All of this is done without oxygen. The second step of cellular respiration is the oxidation of pyruvate, which takes place in the mitochondria. The process starts with the pyruvic acid entering the mitochondria. Then the pyruvic acid loses a CO2 then combines with coenzyme A to create Acetyl CoA for further break down. Finally, a NAD+ (an electron carrier) gains an electron from the CO2 and turns into NADH. The third step is called the Krebs Cycle (a.k.a. Citric Acid Cycle) which takes place in the mitochondria and starts off with Acetyl CoA a C2 which combines with a C4 to create a C6 then it loses a CO2. With the CO2 a NADA+ is transferred into a NADH. Then a C5 loses a CO2 and then another NAD+ is converted to NADH. Continuing along the cycle a C4 loses a CO2 so an ADP is tuned into ATP. Then a C3 loses a CO2 and turns FAD+ into FADH2. The net gain of the Krebs cycle is one FADH2, one ATP and two NADH. The last step of cellular respiration is the Electron transport chain (ETC). The ETC takes place in the inner mitochondrial membrane. Electrons from Hydrogen are carried by NADH and passed down an electron transport chain to result in the production of ATP. Results...

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