Krebs cycle Original Scenario-Based Download PDF

Questions

1. 1.

   A nanoscopic bio-probe navigates the fluid of an engineered mitochondrial matrix, tasked with tracking the chemical transformations of a single two-carbon acetyl unit entering the citric acid cycle. The probe docks near the condensation of acetyl-CoA with oxaloacetate and records every decarboxylation, electron reduction, and substrate-level phosphorylation until oxaloacetate is regenerated. Which telemetry log accurately accounts for the direct net molecular yield generated from the complete oxidation of this single acetyl group?

   • A) 1 molecule of carbon dioxide, 2 NADH, 2 FADH2, and 2 ATP (or GTP)
   • B) 2 molecules of carbon dioxide, 3 NADH, 1 FADH2, and 1 ATP (or GTP)
   • C) 4 molecules of carbon dioxide, 6 NADH, 2 FADH2, and 2 ATP (or GTP)
   • D) 2 molecules of carbon dioxide, 4 NADH, 0 FADH2, and 2 ATP (or GTP)