Role of O₂ and Electron Transport Chain — NEET Biology
🔥 Predicted for NEET 2027We have till now seen that glucose has been broken down to release CO2 and eight molecules of NADH + H+ and two of FADH2 have been synthesised besides just two molecules of ATP in TCA cycle. You may be wondering why we have been discussing respiration at all – neither O2 has come into the picture nor the promised large number of ATP has yet been synthesised. Also what is the role of the NADH + H+ and FADH2 that is synthesised? Let us now understand the role of O2 in respiration and how ATP is synthesised.
Adjacent to a frequently-asked paragraph in the same chapter.
Which metabolic process contributes to only 2 ATPs despite involving many steps?
View solution & NCERT explanation
Correct answer: B — Krebs cycle
Only one GTP (converted to ATP) per turn is produced per acetyl-CoA.
What does NCERT say about We have till now?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.
You just learned this concept. The free app turns it into a daily goal built from your weak topics and brings it back just before you forget it — using active recall and spaced repetition — so it stays till exam day.