One of the following was either used or produced in both pyruvate processing and the citric acid cycle - which one?

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BlackTom AI · Accepted Answer

Starting with a broad view, both pyruvate processing and the citric acid cycle are metabolic steps in cellular respiration that release carbon in the form of CO2, though at different stages. 
Option 1: 'CO2 was produced in both processes' — this is the correct statement. In pyruvate processing (the pyruvate dehydrogenase complex), one molecule of CO2 is released along with NADH as pyruvate is converted to acetyl-CoA. In the citric acid cycle, CO2 is released during multiple decarboxylation steps, notably when isocitrate is converted to alpha-ketoglutarate and when alpha-ketoglutarate is converted to succinyl-CoA. So CO2 production occurs in both stages. 
Option 2: 'O2 was consumed in both processes' — oxygen consumption is not part of either the pyruvate dehydrogenase step or the TCA cycle itself. Oxygen is consumed later during the electron transport chain where NADH and FADH2 donate electrons, but neither of these two steps directly uses O2 as a substrate. Thus this statement is incorrect. 
Option 3: 'CO2 was consumed in both processes' — decarboxylation in these pathways releases CO2, it is not consumed. Saying CO2 is consumed contradicts what actually happens, making this option false. 
Option 4: 'O2 was produced in both processes' — neither pyruvate processing nor the TCA cycle generates O2. Oxygen gas is not a product of these core catabolic steps; any generation of O2 would be chemically incorrect in this context, so this choice is also incorrect.

One of the following was either used or produced in both pyruvate processing and the citric acid cycle - which one?

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One of the following was either used or produced in both pyruvate processing and the citric acid cycle - which one?

View Explanation

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Similar Questions

Question at position 93 The final electron acceptor in aerobic cellular respiration is:FADH2NADHO2CO2

Question at position 3 Aerobic respiration is the way that we:produce CO2 from O2make ATP from CO2produce O2 from CO2synthesize glucoseget chemical energy from our food

Which one of the following types of organisms does not use or make ATP?

Oxygen is not used at any point in the citric acid cycle. However, the cycle will not work without oxygen because

In aerobic organisms, the ultimate electron acceptor in the _____ of carbon fuels is _____.

Which one of the following does not take place in the mitochondrial matrix?

According to the video, which one of the following best describes the role of the mitochondrion?

In the radish seed experiment, what is happening in the number 3 Petri dish with seeds that received water, but no sunlight?

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