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The citric acid cycle in respiration yields:
1 GTP, 3 NADH, 1 FADH2, 2 CO2
2 GTP, 2 FADH2, 6 NADH, 2 CO2
4 GTP, 6 NADH, 4 FADH2, 2 CO2
32 GTP, 2 NADH, 4 FADH2, 4 CO2
Answers (1)
The citric acid cycle, also known as the Krebs cycle or the tricarboxylic acid (TCA) cycle, is an essential part of cellular respiration. It occurs in the mitochondria and involves a series of reactions that result in the oxidation of acetyl-CoA and the production of energy-rich molecules.
The products generated during one turn of the citric acid cycle are as follows:
1 ATP or GTP (guanosine triphosphate): Through substrate-level phosphorylation, one high-energy phosphate bond is transferred to ADP or GDP, forming ATP or GTP, respectively. The choice between ATP or GTP synthesis depends on the organism and specific conditions.
3 NADH (nicotinamide adenine dinucleotide): NADH is an energy carrier that stores electrons captured during the oxidation reactions in the cycle. These electrons are used in subsequent stages of cellular respiration to generate ATP through oxidative phosphorylation.
1 FADH2 (flavin adenine dinucleotide): FADH2 is another energy carrier that stores electrons. It is formed when FAD (flavin adenine dinucleotide) accepts electrons during one of the reactions in the citric acid cycle. Similar to NADH, FADH2 donates its electrons to the electron transport chain for ATP synthesis.
2 CO2 (carbon dioxide): Two molecules of CO2 are released as byproducts of the cycle. These CO2 molecules represent the carbon atoms originally derived from acetyl-CoA, which enter the cycle and are oxidized.
It is important to note that these product yields represent the results of one full turn of the citric acid cycle. In reality, glucose metabolism generates two molecules of acetyl-CoA, so these product yields are doubled when considering the complete oxidation of one glucose molecule. Hence, the correct answer is option 1.
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