What is the purpose of the electron transport chain in the cell?

Answer 1

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Answer 2

In the thylakoid of chloroplasts, photons of light are received into photosystem II where 2e- (from hydrolysis of H2O) are promoted to a higher energy level where they are received by electron acceptor A.

After this they are past down through electron carriers, and these 2e- loose energy as they are past down. Here they phosphorylate ADP+Pi into ATP. The flow of 2e- being past down through electron carriers creates a flow and pumps H+ ions from the stroma into the thylakoid.

Once the 2e- have been past down the electron carriers they are received by photosystem I which uses even more light energy to promote the 2e- to an even higher energy level. They are accepted by electron acceptor B.

This flow allows the 2H+ from the photolysis of H2O to flow out of the inner thylakoid space into the stroma through ATP synthase (turning the turbine and phosphorylating ADP+Pi into ATP) due to a H+ concentration gradient.

The H+ combine with NADP+ to create NADPH+H+ in the stroma.

Answer 3

The Electron Transport Chain occurs in the inner membrane of the mitochondrion.

Answer 4

ETC is located on the mitochondrial membrane but only in EUKARYOTES. In prokaryotes, the ETC is located in the cell membrane.