What are the two jobs of photosystem II?

The energized electrons are replaced by oxidizing water to form hydrogen ions and molecular oxygen. to NADPH or are used in non-cyclic electron flow. DCMU is a chemical often used in laboratory settings to inhibit photosynthesis….Structure of complex.

What is charge separation in photosynthesis?

Charge separation is one of the key processes in photosynthetic energy conversion. Subsequent electron transfer results in a stable charge-separated state which ultimately powers the photosynthetic organism.

Where does charge separation occur in photosynthesis?

1.1. A general introduction: charge separation in photosynthetic reaction centres. When chlorophyll absorbs light, an electron is promoted from the highest occupied molecular orbital to the lowest or second lowest unoccupied molecular orbital.

What is split in photosystem 2?

Photosystem 2 (PS2) is the part of the photosynthetic apparatus that uses light energy to split water releasing oxygen, protons and electrons.

Where does charge separation occur?

Charge separation occur at GaN and electrons transferred from VB to the CB of GaN where the electrons contributes in water reduction.

What is net charge separation?

Whenever charge is created or destroyed, equal amounts of positive and negative are involved. Most often, existing charges are separated from neutral objects to obtain some net charge. Both positive and negative charges exist in neutral objects and can be separated by rubbing one object with another.

How is charge separation in photosystem II reviewed?

► Charge separation in Photosystem II is reviewed from a historical perspective. ► The electron acceptor reactions of Type II reaction centres is described and compared. ► Differences among Type II reaction centres are associated with photoprotection. ► We discuss some evolutionary aspects of Photosystem II photochemistry. Previous articlein issue

Which is the primary electron donor in photosystem 2?

However, when the excitation arrives on a particular chlorophyll in the reaction centre, rather than passing on the excitation energy to a neighbouring pigment, an electron is transferred instead, resulting in the first charge separation. The “particular” reaction centre chlorophyll of the last sentence is known as the primary electron donor.

How does charge separation occur in a photosynthetic reaction?

A general introduction: charge separation in photosynthetic reaction centres When chlorophyll absorbs light, an electron is promoted from the highest occupied molecular orbital to the lowest or second lowest unoccupied molecular orbital. The energy in red light corresponds to the transition up to the first excited singlet state.

How is charge separation and electron transfer performed in PSII?

Fig. 1. A simplified scheme of charge separation and electron transfer events in (A) PSII and (B) the purple bacterial reaction centre. Red arrows represent electron transfer steps and the blue numbered circles the order of steps. Step 1 is shown in more detail in Fig. 2.