Question

Final electron acceptor in ETS is
A) \[{H_2}O\]
B) \[{O_2}\]
C) Cyt\[{a_3}\]
D) Cyt a

Answer 1

Hint: A chemical object that accepts electrons transferred from another compound is known as an electron acceptor. It is an oxidising agent that is reduced in the process as a result of accepting electrons.

Complete answer:
The ETS (in abbreviated form) or Electron transport chain is the term used to describe the electron transport system. The ETS is a set of carrier molecules that can serve as both an electron (or hydrogen) acceptor and an electron donor, undergoing alternate reduction and oxidation. In eukaryotes, ETS components are found in the inner membrane of mitochondria, while in prokaryotes, they are found in the cytoplasmic membranes.

An exergonic mechanism is the flow of electrons through the electron transport chain. The redox reactions generate an electrochemical proton gradient, which drives adenosine triphosphate synthesis (ATP).The movement of electrons in aerobic respiration comes to a halt as molecular oxygen serves as the final electron acceptor. Some electron acceptors, such as sulphate, are used in anaerobic respiration. Now we know that, in the electron transport system that leads to water formation, oxygen is the terminal electron acceptor. As a result, it's also known as oxidative phosphorylation.

Additional Information: The key producer of ATP in the process is oxidative phosphorylation, which is the fourth and final stage in cellular respiration. Oxidative phosphorylation is an aerobic process that occurs only when oxygen is present. The electron transport chain and chemiosmosis are two components of oxidative phosphorylation.

Thus the correct answer is option ‘B’.

Note: Remember that the inner mitochondrial membrane holds the electron transport system. Via a sequence of redox reactions, electrons are moved from one member of the transport chain to another.