Respiratory Balance Sheet — Prelims Strategy

Prelims Strategy

To excel in NEET questions on the Respiratory Balance Sheet, a systematic approach is crucial. First, thoroughly understand each stage of aerobic respiration: Glycolysis, Pyruvate Oxidation, Krebs Cycle, and ETS.

Memorize the inputs, outputs (especially ATP, NADH, FADH$_2$, and CO$_2$), and location of each stage. For numerical problems, always pay close attention to the specific ATP equivalents given for NADH and FADH$_2$ (2.

5/1.5 or 3/2) and the type of shuttle system mentioned for cytoplasmic NADH (Malate-Aspartate or Glycerol-3-Phosphate). If not specified, assume the modern 2.5/1.5 convention and the Malate-Aspartate shuttle for the highest yield (32 ATP).

Practice breaking down the calculation step-by-step for each stage. For conceptual questions, focus on distinguishing between substrate-level and oxidative phosphorylation, the role of oxygen, and the relative efficiency of aerobic versus anaerobic respiration.

Be wary of trap options that use incorrect ATP equivalents or mix up the shuttle systems. Drawing out the entire pathway with ATP/NADH/FADH$_2$ counts can be a helpful visual aid during revision.