Fermentation — Prelims Strategy

Prelims Strategy

To ace NEET questions on fermentation, adopt a multi-pronged strategy. Firstly, master the basics: clearly understand that fermentation is an anaerobic process, occurs in the cytoplasm, and its main goal is $\text{NAD}^+$ regeneration.

Secondly, differentiate the types: create a mental or written table comparing lactic acid and alcoholic fermentation based on their end products (lactic acid vs. ethanol + $\text{CO}_2$), specific enzymes (lactate dehydrogenase vs.

pyruvate decarboxylase + alcohol dehydrogenase), and representative organisms (muscle cells/bacteria vs. yeast). Thirdly, focus on ATP yield: remember that fermentation always yields a net of 2 ATP per glucose, exclusively from glycolysis.

Fourthly, avoid common traps: do not confuse fermentation with anaerobic respiration (which uses an inorganic electron acceptor and may involve an ETC), and remember that glucose is only partially oxidized.

For conceptual questions, carefully read each option and eliminate distractors based on your clear understanding of the pathways. For questions involving organisms, ensure you know which organism performs which type of fermentation.

Practice drawing out the simplified pathways for both types to reinforce the intermediates and enzyme actions.