Which stage comes right before the citric acid cycle?Group of answer choicesoxidative phosphorylationpyruvate oxidationglycolysis
Question
Which stage comes right before the citric acid cycle?
- Group of answer choices
- oxidative phosphorylation
- pyruvate oxidation
- glycolysis
Solution
To determine which stage comes right before the citric acid cycle, we can analyze the processes involved in cellular respiration.
-
Glycolysis: This is the first stage of cellular respiration, where glucose is broken down into pyruvate, producing a small amount of ATP and NADH.
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Pyruvate Oxidation: This stage follows glycolysis. Here, pyruvate produced during glycolysis is transported into the mitochondria, where it is converted into acetyl-CoA. This process also generates NADH and releases carbon dioxide.
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Citric Acid Cycle (Krebs Cycle): This cycle begins with the acetyl-CoA produced from pyruvate oxidation. It further processes the acetyl groups to produce ATP, NADH, FADH2, and carbon dioxide.
From this analysis, we can conclude that the stage that comes right before the citric acid cycle is pyruvate oxidation.
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