Question

starting with citrate, how many of the following would be produced with three turns of the citric acid cycle?
1 atp, 2 co2, 3 nadh, and 1 fadh2
2 atp, 2 co2, 1 nadh, and 3 fadh2
3 atp, 6 co2, 9 nadh, and 3 fadh2
3 atp, 3 co2, 3 nadh, and 3 fadh2
8
multiple choice 5 points
carbon dioxide (co2) is released during which of the following stages of cellular respiration?
glycolysis and the oxidation of pyruvate to acetyl coa
oxidative decarboxylation of pyruvate to acetyl coa and the citric acid cycle
the citric acid cycle and oxidative phosphorylation
oxidative phosphorylation and fermentation
9
multiple choice 5 points
which metabolic process is most closely associated with intracellular membranes?
substrate-level phosphorylation
oxidative phosphorylation
glycolysis
the citric acid cycle
alcohol fermentation

Explanation:

• For the first question: In one turn of the citric acid cycle, 1 ATP, 2 CO₂, 3 NADH, and 1 FADH₂ are produced. So for three turns, it's 3 ATP, 6 CO₂, 9 NADH, and 3 FADH₂.
• For the second question: CO₂ is released during the oxidative decarboxylation of pyruvate to acetyl CoA (1 CO₂ per pyruvate) and in the citric acid cycle (2 CO₂ per acetyl - CoA).
• For the third question: Oxidative phosphorylation occurs on the inner mitochondrial membrane (in eukaryotes) or the plasma membrane (in prokaryotes), which are intracellular membranes. Substrate - level phosphorylation occurs in the cytoplasm (glycolysis) or mitochondrial matrix (citric acid cycle). Glycolysis occurs in the cytoplasm. The citric acid cycle occurs in the mitochondrial matrix. Alcohol fermentation occurs in the cytoplasm.

Answer:

• First question: 3 ATP, 6 CO2, 9 NADH, and 3 FADH2
• Second question: oxidative decarboxylation of pyruvate to acetyl CoA and the citric acid cycle
• Third question: oxidative phosphorylation