MHT CET 202624 AprilMorning Shift
- Exam
- MHT CET
- Year
- 2026
- Date
- 24 April
- Shift
- Morning Shift
- Subject
- Biology
- Chapter
- Respiration in Plants
MHT CET 2026 · 24 April · Morning Shift · Biology · Respiration in Plants
The ultimate electron acceptor in ETS in aerobic respiration is...
The ultimate electron acceptor in ETS in aerobic respiration is ___________ and it reacts with protons to form ________.
Options
- ACytochrome a, water
- BMolecular oxygen, metabolic water
- CGlucose, Carbon di-oxide
- DHydrogen, acetaldehyde
Correct answer
B. Molecular oxygen, metabolic water
Step-by-step solution
In the electron transport system (ETS) of aerobic respiration, the final or ultimate electron acceptor is molecular oxygen.
Oxygen accepts electrons from cytochrome c oxidase (Complex IV) and reacts with protons from the mitochondrial matrix to form metabolic water.
The reaction is \dfrac{1}{2} O_2 + 2H^+ + 2e^- \rightarrow H_2O$.
Answer: Molecular oxygen, metabolic water
Oxygen accepts electrons from cytochrome c oxidase (Complex IV) and reacts with protons from the mitochondrial matrix to form metabolic water.
The reaction is \dfrac{1}{2} O_2 + 2H^+ + 2e^- \rightarrow H_2O$.
Answer: Molecular oxygen, metabolic water