Cellular Respiration (Some Background Knowledge Required)

Biology Tutorial

Cellular Respiration (Some Background Knowledge Required)

Intro

Cellular Respiration is the process by which O2 (oxygen) and C6H12O6 (glucose) is converted into CO2 (carbon dioxide), H2O (water), and ATP–the energy currency of the cell. This process is divided into three stages: 1). Glycolysis 2). Citric Acid Cycle 3). Electron Transport Chain. During Glycolysis, which occurs in the cytoplasm, glucose is split into Pyruvate, electrons are delivered through NADH, and a portion of ATP is derived. The chain of events in the Citric Acid Cycle, which happens in the mitochondrial matrix, is as follows: Pyruvate–>Acetyl Coa–>CO2+ NADH+FADH2+(portion of) ATP. The Citric Acid cycle takes place on the inner-mitochondrial membrane. It involves (the reactants are) NADH+FADH2+O2 and results in H2O+ a large payoff of ATP. For more information, consider this explanation from Khan Academy. Keep in mind, sources differentiate in how they split up the steps of Cellular Respiration. https://www.khanacademy.org/science/biology/cellular-respiration-and-fermentation/overview-of-cellular-respiration-steps/a/steps-of-cellular-respiration

Sample Problem

1). Really consider each stage of Cellular Respiration. Which stage occurs in both Eukaryotic and Prokaryotic cells (ones with and without a nucleus)?

2). Which two stages of Cellular Respiration produce a small amount of ATP?

Solution

1). Have you given this some thought? Hopefully, you found the answer to be Glycolysis. As was previously stated, Glycolysis occurs in the cytoplasm of cells, while the others take place in the mitochondria. Prokaryotes do, of course, contain cytoplasm, but no mitochondria.

2). Glycolysis and the Citric Acid Cycle.



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