Electron Transfer & ATP Synthesis — NEET Biology
📚 Practice Concept• The passing on of the electrons removed as part of the hydrogen atoms to molecular O2 with simultaneous synthesis of ATP.
Which of the following statements correctly describe the aerobic nature of the TCA cycle and the role of oxygen in cellular respiration? S1: Oxygen is directly consumed during the formation of succinyl-CoA from α-ketoglutaric acid in the TCA cycle. S2: The Electron Transport System (ETS) can function effectively to regenerate NAD⁺ and FAD⁺ even in the absence of molecular oxygen. S3: The reduced coenzymes (NADH+H⁺ and FADH₂) generated during glycolysis and the TCA cycle must be reoxidized by oxygen in the ETS for the continuous operation of the TCA cycle. S4: Oxygen acts as the terminal hydrogen acceptor, driving the entire process of oxidative phosphorylation by removing electrons from the system. S5: Without the availability of oxygen, the accumulation of reduced coenzymes would feedback inhibit enzymes of both glycolysis and the TCA cycle, thus halting the complete oxidation of glucose.
Through deep analysis of NEET and NTA, 88 of 90 questions from the NEET 2026 paper were matched straight from the MedicNEET Biology question bank.
88/90MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.