Pyruvate, the end product of glycolysis, follows different catabolic pathways depending on the:
Correct answer: D. Organism and metabolic conditions
- A. Organism
- B. Metabolic conditions
- C. Size of organism
- D. Organism and metabolic conditions
Explanation
Pyruvate, the end product of glycolysis, can undergo various metabolic pathways depending on the organism and its metabolic conditions. In eukaryotes, the presence of mitochondria allows for aerobic respiration, converting pyruvate into acetyl-CoA for entry into the Krebs cycle. In the absence of oxygen or in organisms like yeast, pyruvate can be converted into ethanol or lactic acid through fermentation. Therefore, both the organism's characteristics and the metabolic conditions, such as the presence or absence of oxygen, determine the pathway.
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About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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Which metabolic pathway breaks down one molecule of glucose into two molecules of pyruvate in the cytoplasm?
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