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Multiple Choice
Which of the following shows the correct steps of cellular respiration?
A
Glycolysis → Pyruvate Oxidation → TCA → ATP Production → ETC
B
Pyruvate Oxidation → Glycolysis → TCA → ATP Production → ETC
C
Glycolysis → TCA → Pyruvate Oxidation → ATP Production → ETC
D
Glycolysis → Pyruvate Oxidation → TCA → ETC → ATP Production
Verified step by step guidance
1
Understand that cellular respiration is a multi-step process that cells use to convert biochemical energy from nutrients into ATP, and then release waste products.
The first step is Glycolysis, which occurs in the cytoplasm and breaks down glucose into two molecules of pyruvate, producing a small amount of ATP and NADH.
Next, Pyruvate Oxidation takes place in the mitochondria, where each pyruvate is converted into Acetyl-CoA, releasing CO2 and generating NADH.
The third step is the TCA cycle (also known as the Krebs cycle or Citric Acid Cycle), which occurs in the mitochondrial matrix. Here, Acetyl-CoA is oxidized, producing CO2, ATP, NADH, and FADH2.
Finally, the Electron Transport Chain (ETC) and ATP Production occur in the inner mitochondrial membrane. Electrons from NADH and FADH2 are transferred through protein complexes, creating a proton gradient that drives ATP synthesis through oxidative phosphorylation.