Glycolysis — Prelims Strategy
Prelims Strategy
To ace NEET questions on glycolysis, a multi-pronged strategy is essential. Firstly, memorize the ten steps of the pathway, focusing on the substrate, product, and enzyme for each step. Pay special attention to the three irreversible steps and their respective enzymes (Hexokinase, PFK-1, Pyruvate Kinase), as these are frequent targets for MCQs.
Secondly, quantify the energy yield: clearly distinguish between ATP consumed (2), ATP produced (4), and net ATP gain (2). Also, remember the production of 2 NADH molecules. Understand that ATP is generated via substrate-level phosphorylation in steps 7 and 10.
Thirdly, know the location: Glycolysis occurs exclusively in the cytoplasm, a crucial detail often tested. Fourthly, understand the oxygen requirement: It's an anaerobic process, a common point of confusion.
Finally, comprehend the fate of pyruvate: its conversion to Acetyl-CoA in aerobic conditions or to lactate/ethanol in anaerobic conditions, and the critical role of regeneration in fermentation.
Practice MCQs that test enzyme names, energy yields, regulatory points, and conceptual understanding of its anaerobic nature and universal presence. Be wary of trap options that confuse glycolysis with other respiratory pathways or misrepresent ATP/NADH counts.