Match the following ATP yields to reactions a to g: (18.4, 18.5, 18.6)


1.5 ATP 2.5 ATP 7 ATP 10 ATP


12 ATP 32 ATP 36 ATP


d. Acetyl CoA goes through one turn of the citric acid cycle.

Verified step by step guidance

1. Identify the reaction given: Acetyl CoA going through one turn of the citric acid cycle.
2. Recall that one turn of the citric acid cycle produces 3 NADH, 1 FADH2, and 1 GTP (or ATP).
3. Understand that each NADH can be converted to approximately 2.5 ATP and each FADH2 to approximately 1.5 ATP during oxidative phosphorylation.
4. Calculate the total ATP yield from the NADH and FADH2 produced: 3 NADH x 2.5 ATP/NADH + 1 FADH2 x 1.5 ATP/FADH2.
5. Add the ATP from GTP (or ATP) produced directly in the cycle to the total ATP yield from NADH and FADH2.

Key Concepts

ATP Yield in Cellular Respiration

ATP yield refers to the amount of adenosine triphosphate (ATP) produced during metabolic processes, particularly in cellular respiration. Different pathways, such as glycolysis, the citric acid cycle, and oxidative phosphorylation, contribute varying amounts of ATP. Understanding these yields is crucial for analyzing energy production in cells.

Citric Acid Cycle (Krebs Cycle)

The citric acid cycle, also known as the Krebs cycle, is a key metabolic pathway that occurs in the mitochondria. It processes acetyl CoA to produce electron carriers (NADH and FADH2) and ATP. One complete turn of the cycle generates a specific yield of ATP, which is essential for understanding the overall energy output of cellular respiration.

Oxidative Phosphorylation

Oxidative phosphorylation is the final stage of cellular respiration, occurring in the inner mitochondrial membrane. It involves the electron transport chain and chemiosmosis, leading to the production of the majority of ATP in aerobic organisms. The efficiency of this process significantly impacts the total ATP yield from glucose metabolism.