Respuesta :
Electron transport chain is found in both cellular respiration and in the light reactions of photosynthesis.
The electron transport chain is made up of a sequence of more than fifteen molecules located in the inner membrane of the mitochondria.
They are capable of giving up or taking electrons, reducing themselves alternately oxidizing.
This enables transport in the form of a cascade, towards lower energy levels, in this way the electron is transported from one acceptor to another, until it reaches its final acceptor.
In the electron transport chain in cellular respiration, electrons produced in glycolysis and in the Krebs cycle go to lower energy levels and energy is released to form ATP.
During this electron transport the transporting molecules are oxidized and reduced, the last electron acceptor in the chain is oxygen.
On the other hand, photosystems transform light energy into chemical energy by exciting and transporting electrons from molecule to molecule, as in a chain, in the thylakoid membrane, this process is called an electron transport chain.
This light-activated electron transport chain is usually continuous in the presence of sunlight.
In the course of the reaction in the presence of light, the water molecule is cleaved to obtain the electrons that transfer the light energy with which ATP and NADPH2 are formed.
Therefore, we can conclude that electron transport chain is found in both cellular respiration and in the light reactions of photosynthesis.
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