Which of the component of respiratory chain reacts directly with molecular oxygen?: (A) Cyt b, (B) CoQ, (C) Cyt C, (D) Cyt aa3
Answer is D. Complex IV: Cyt-c Oxidase The system functions: * As proton pump * Catalyses transfer of electrons to molecular O2 to form H2O. This is the terminal component of ETC. It catalyses the transfer of electrons from Cyt-c to molecular O2 Cyt-a, Cu++ ions and Cyt-a3.Ref: MN Chatterjea Textbook of Medical Biochemistry, 8th edition, page no: 142