Question

Final product of ETS of mitochondria is
A. ${{\text{H}}_2}{\text{O}}$
B. ${{\text{H}}^ + }$
C. Electrons
D. All of the above

Answer 1

The electron transport system or ETS is a series of complexes where electrons are getting transferred from electron donors to electron acceptors via redox reactions. During this transfer, both reduction and oxidation take place simultaneously.

Complete answer:
Mitochondria are known as the powerhouse of the cell as it produces ATP which is used as energy during the various metabolic processes.

Electron Transport Chain is a series of complex reactions. The molecules found in the system are constructed with the enzymes that are proteins, peptides, and much more. A huge amount of ATP can be generated through this method. The electrons are moved from the electron donor to the electron receiver which causes the production of ATP. It is one of the most efficient phases in the electron transport system.

The electron transport system can be explained as a series of a redox reaction or reduction and oxidation reactions that occur simultaneously. It is a part of aerobic respiration. It is the only method where glucose metabolism takes place using oxygen as the final acceptor molecule. When electrons are transferred from one component to another step by step and at the end of the system the electrons decrease the amount of the molecular oxygen and produce producing water or ${{\text{H}}_2}{\text{O}}$.

${{\text{H}}^ + }$ ions are pumped out in the intermembrane spaces through the electron transport chains. The ${{\text{H}}^ + }$ starts flowing down back into the chromosomal matrix through the ATP molecule.

The electrons are transferred through the electron transport chain and are finally accepted by the oxygen through a series of reactions that produces water.

Hence, the correct answer is option (A).

Additional information:
Cellular respiration also takes place in the mitochondria. There are two pathways of cellular respiration, one is glycolysis and the other is the citric acid cycle. This cellular respiration generates ATP. However, most of the ATP produces at the time of the aerobic catabolism of glucose or glycolysis.

Note: The structural and functional unit of the body is the cell which is composed of various cell organelles. Mitochondria is such a membrane-bound cell organelle where the cellular respiration and ATP production takes place. This ATP is generated through a series of complex reactions which is called electron transport system or ETS. ETS is the system where electrons are transferred from the electron donor to electron acceptor. And at the end of the system, the amount of molecular oxygen reduces and it produces water. So, the final product of ETS of mitochondria is ${{\text{H}}_2}{\text{O}}$.