1.During which stage of cellular respiration is most ATP made? C
A. Glycolysis
B. Chemiosmosis
C. Electron Transport Chain
D. Citric acid Cycle
yes, by a wide margin.
The stage of cellular respiration during which most ATP is made is the Electron Transport Chain.
To arrive at this answer, let's go through each option:
A. Glycolysis: Glycolysis is the first stage of cellular respiration and takes place in the cytoplasm. It involves the breakdown of glucose molecules into two molecules of pyruvate. While glycolysis does produce ATP, it is a relatively small amount compared to the ATP produced in other stages.
B. Chemiosmosis: Chemiosmosis is not a stage of cellular respiration, but rather an important process that occurs during the Electron Transport Chain.
C. Electron Transport Chain: The Electron Transport Chain is the third stage of cellular respiration, and it takes place in the inner mitochondrial membrane in eukaryotes. During this stage, electrons from NADH and FADH2, produced from earlier stages, are passed along a series of protein complexes in the inner mitochondrial membrane. As the electrons flow through these complexes, protons (H+) are pumped across the membrane, creating a proton gradient. This gradient powers ATP synthase, an enzyme that produces ATP. The Electron Transport Chain generates the majority of ATP in cellular respiration.
D. Citric acid Cycle: The Citric acid Cycle, also known as the Krebs cycle, is the second stage of cellular respiration. It takes place in the mitochondrial matrix and involves the oxidation of acetyl-CoA, produced from the breakdown of pyruvate, to generate NADH and FADH2. While the Citric acid Cycle does produce some ATP, it is not as significant as the ATP produced in the Electron Transport Chain.
Therefore, the correct answer is C. Electron Transport Chain.