How many moles of ATP are produced by the complete oxidation of 1 mol of myristic acid?

검증된 단계별 안내

Understand the problem: Myristic acid is a saturated fatty acid with the chemical formula C₁₄H₂₈O₂. The complete oxidation of fatty acids involves beta-oxidation, the citric acid cycle, and oxidative phosphorylation to produce ATP.

Determine the number of beta-oxidation cycles: Each cycle of beta-oxidation shortens the fatty acid chain by 2 carbons, producing 1 FADH₂, 1 NADH, and 1 acetyl-CoA. For myristic acid (14 carbons), the number of beta-oxidation cycles is (14/2) - 1 = 6 cycles.

Calculate the ATP yield from beta-oxidation: Each beta-oxidation cycle produces 1 FADH₂ (1.5 ATP) and 1 NADH (2.5 ATP). Multiply these values by the number of cycles (6) to find the total ATP from beta-oxidation.

Determine the ATP yield from acetyl-CoA: Each acetyl-CoA enters the citric acid cycle, producing 3 NADH (7.5 ATP), 1 FADH₂ (1.5 ATP), and 1 GTP (1 ATP). For myristic acid, 7 acetyl-CoA molecules are produced (one from each beta-oxidation cycle and one from the final 2-carbon fragment). Multiply these values by 7 to find the total ATP from acetyl-CoA.

Account for the energy cost of activation: The activation of myristic acid to form acyl-CoA requires 2 ATP. Subtract this value from the total ATP calculated in the previous steps to find the net ATP yield from the complete oxidation of 1 mol of myristic acid.

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주요 개념

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Beta-Oxidation

Beta-oxidation is the metabolic process by which fatty acids are broken down in the mitochondria to generate acetyl-CoA. Each cycle of beta-oxidation shortens the fatty acid chain by two carbon atoms, producing one molecule of acetyl-CoA, which then enters the citric acid cycle for further energy extraction.

Citric Acid Cycle (Krebs Cycle)

The citric acid cycle is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetyl-CoA. Each turn of the cycle produces ATP, NADH, and FADH2, which are crucial for the electron transport chain, ultimately leading to the production of additional ATP.

Oxidative Phosphorylation

Oxidative phosphorylation is the final stage of cellular respiration, occurring in the inner mitochondrial membrane. It involves the transfer of electrons through the electron transport chain, creating a proton gradient that drives ATP synthesis via ATP synthase. This process is responsible for producing the majority of ATP during the complete oxidation of fatty acids.