Question

In Electron transport system (ETS) which of the following cytochrome reacts with oxygen?

• A. Cyt b
• B. Cyt a ${}_3$
• C. Cyt b ${}_6$
• D. Cyt f
• E. Cyt b${}_2$

Answer 1

The correct option is B Cyt a ${}_3$

An electron transport chain (ETC) is a series of compounds that transfers electrons from electron donors to electron acceptors via redox reactions, and couples this electron transfer with the transfer of protons across a membrane. This creates an electrochemical proton gradient, that drives ATP synthesis, or the generation of chemical energy in the form of adenosine triphosphate (ATP). The final acceptor of electrons in the electron transport chain is molecular oxygen. Cyt a${}_3$ finally transfer electrons to $O_2$.