Question

what structure is found at the start of the electron transport chain in the thylakoid membrane in the chloroplast? What happens there?

Answer 1

Photosystem II, containing the enzyme water-plastoquinone oxidoreductase is found at the start of electron transport chain in thylakoid membrane. It also consists of cofactors like chlorophyll, heme, etc. Photosystem II integrated into the membrane.

Photosystem II causes the splitting of Water, thereby liberating high energy electrons for the photosynthesis to occur. Water is oxidized into oxygen. The process of spiltting of water uses the energy of photons from light as the source of energy. These electrons are then used to reduce plastquinone which carries the electron downstream in the electron transport chain.

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