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Biology
Posted 4 months ago
Describe the steps of aerobic cellular respiration and the amount of energy it produces
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Answer from Sia
Posted 4 months ago
Answer
Aerobic cellular respiration consists of four main steps: glycolysis, the transition reaction, the Krebs cycle, and the electron transport chain (ETC), producing a total of about 30-32 ATP molecules per glucose molecule.
Solution
a
Glycolysis: This process occurs in the cytoplasm and breaks down one molecule of glucose into two molecules of pyruvate, producing a net gain of 2 ATP and 2 NADH
b
Transition Reaction: Pyruvate is transported into the mitochondria and converted into acetyl-CoA, producing 2 NADH (one for each pyruvate)
c
Krebs Cycle: Acetyl-CoA enters the Krebs cycle, also known as the citric acid cycle, which takes place in the mitochondrial matrix. Each turn of the cycle generates 1 ATP, 3 NADH, and 1 FADH2 per acetyl-CoA, totaling 2 ATP, 6 NADH, and 2 FADH2 per glucose since each glucose yields two acetyl-CoA molecules
d
Electron Transport Chain (ETC) and Oxidative Phosphorylation: NADH and FADH2 donate electrons to the ETC, which are passed through a series of protein complexes in the inner mitochondrial membrane. The energy released from electron transfer is used to pump protons across the membrane, creating a proton gradient. ATP is synthesized as protons flow back into the matrix through ATP synthase. This process yields approximately 26 to 28 ATP per glucose molecule
Key Concept
Aerobic cellular respiration is a multi-step metabolic pathway that converts glucose into ATP, the energy currency of the cell, with the presence of oxygen.
Explanation
The process involves glycolysis, the transition reaction, the Krebs cycle, and the electron transport chain, resulting in the production of approximately 30-32 ATP molecules from one molecule of glucose.

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