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The answer is the second choice: variation, overpopulation, adaptation
The reaction of cellular respiration and fermentation substrate level phosphorylation occur in both glycolysis and the citric acid cycle.
This phosphorylation occurs in the cytoplasm of cell and in mitochondria. When the phosphorylation inside the mitochondria, it occur during Krebs cycle. In this reaction the molecules are broken down in presence of oxygen to produce energy.
In cytoplasm, the reaction occur during the glycolysis. It is the reaction to add a phosphate group to a molecule that is derived from ATP.
Krebs cycle this is also known as citric acid cycle (CAC). This is the reactions in which oxidation of acetic acid provides energy for storage in phosphate bonds.
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Cellular respiration uses energy in glucose to make ATP. Aerobic (“oxygen-using”) respiration occurs in three stages: glycolysis, the Krebs cycle, and electron transport. In glycolysis, glucose is split into two molecules of pyruvate. This results in a net gain of two ATP molecules.
A chromosome number of 92