Question

What is respiratory chain or ETC? What is its significance?

Answer 1

Answer:

Electron Transport Chain

The mitochondrial electron transport chain is a series of enzymes and coenzymes in the crista membrane, each of which is reduced by the preceding coenzyme, and in turn reduces the next, until finally the protons and electrons that have entered the chain from either NADH or reduced flavin reduce oxygen to water.

Explanation:

Each of the three cellular respiration phases incorporates important cell processes, but the ETC produces by far the most ATP. Since energy production is one of the key functions of cell respiration, ATP is the most important phase from that point of view.

Where the ETC produces up to 34 molecules of ATP from the products of one glucose molecule, the citric acid cycle produces two, and glycolysis produces four ATP molecules but uses up two of them.

The other key function of the ETC is to produce NAD and FAD from NADH and FADH in the first two chemical complexes. The products of the reactions in ETC complex I and complex II are the NAD and FAD molecules that are required in the citric acid cycle.

As a result, the citric acid cycle is dependent on the ETC. Since the ETC can only take place in the presence of oxygen, which acts as the final electron acceptor, the cell respiration cycle can only operate fully when the organism takes in oxygen.

Answer 2

Answer:

Electron transport chain or ETC is one of the most important process of aerobic respiration,Electron transport chain occur in mitocondria.

Explanation:

Electron transport chain deals with the electron to various electron carriers along with the transport of proton.The electron carriers those  are involved  as electron carriers are NADH COQ oxidoreductase,succinate q reductase,cytochrome c reductase, cytochrome a oxidase and ATP synthetase.Electron travel through various electron carrier and finally reaches the terminal electron acceptor known as oxygen resulting in the reduction of oxygen  to water and formation of ATP from energy generated proton motive force .