What are the products of one round of the Krebs cycle?

The correct answer outlines the products of one round of the Krebs cycle, also known as the citric acid cycle. During this cycle, which occurs in the mitochondria, a series of enzymatic reactions leads to the oxidative breakdown of acetyl-CoA derived from carbohydrates, fats, and proteins.

In one turn of the Krebs cycle, the following products are produced: three molecules of NADH, which serve as electron carriers to transport electrons to the electron transport chain for ATP production; one molecule of FADH2, another electron carrier but with a slightly different energy level compared to NADH; one ATP (or GTP, depending on the organism), which directly provides energy for cellular activities; and two molecules of carbon dioxide as a byproduct of the decarboxylation reactions that occur during the cycle.

This specific stoichiometry reflects the complete oxidative degradation of the acetyl group entering the Krebs cycle, leading to a total of two carbon atoms from one acetyl-CoA resulting in the release of two CO2 molecules. The production of high-energy electron carriers like NADH and FADH2 is particularly important, as they play a crucial role in ATP synthesis in subsequent stages of cellular respiration.