The electron is then passed to plastoquinone Qa and then to plastoquinone Qb. These plastoquinone molecules are embedded in the D2 and D1 proteins. … When one of the many photons of light flooding a leaf hits a chlorophyll molecule surrounding the reaction center, it creates resonance energy.
Does resonance energy transfer occur in photosystem 2?
Fortunately, the energy from a light-excited electron is easily transferred through the process of resonance energy transfer. … To take advantage of this property, photosystems have large antennas of light-absorbing molecules that harvest light and transfer their energy inwards to the reaction center.
What happens in PSII?
PSII is the multisubunit chloroplast membrane-associated pigment–protein complex that uses the energy of sunlight to drive the oxidation of water, evolving oxygen, donating electrons into the photosynthetic electron transfer chain, and depositing protons into the thylakoid lumen.
What does Phaeophytin do in photosynthesis?
Pheophytin or phaeophytin (abbreviated Pheo) is a chemical compound that serves as the first electron carrier intermediate in the electron transfer pathway of Photosystem II (PS II) in plants, and the type II photosynthetic reaction center (RC P870) found in purple bacteria.
What happens to energy lost in photosystem 2?
The two electrons lost from photosystem II are replaced by the splitting of water molecules. Water splitting also releases hydrogen ions into the lumen. This contributes to a hydrogen ion gradient similar to the one created by mitochondrial electron transport.
Where does resonance energy transfer occur?
Principles of Fluorescence Resonance Energy Transfer
The process of resonance energy transfer (RET) can take place when a donor fluorophore in an electronically excited state transfers its excitation energy to a nearby chromophore, the acceptor.
Where does resonance energy transfer occur quizlet?
resonance energy transfer occurs in antenna complex pigments, Where does redox occur in the chlorophylls? redox occurs in reaction center pigments.
What is happening with matter and energy in PSII?
The energy absorbed in PSII is enough to oxidize (split) water, releasing oxygen into the atmosphere; the electrons released from the oxidation of water replace the electrons that were boosted from the reaction center chlorophyll.
What causes the electron to leave PSII?
Light that is harvested from PSII causes an excited electron of the chlorophyll a special pair to be passed down an electron transport chain (Pq, Cyt, and Pc) to PSI. … The passing of the electron in the first part of the electron transport chain causes protons to be pumped from the stroma to the thylakoid lumen.
What molecules are made in PSII?
Photosystem II obtains replacement electrons from water molecules, resulting in their split into hydrogen ions (H+) and oxygen atoms. The oxygen atoms combine to form molecular oxygen (O2), which is released into the atmosphere.
What is the function of plastoquinone?
Plastoquinone (PLQ) is the charge carrier responsible for the electron transport from PSII to Cyt b6f.
Is plastoquinone a hydrogen carrier?
The function of the plastoquinone pool as a possible pump for vectorial hydrogen (H+ + e-) transport across the thylakoid membrane has been investigated in isolated spinach chloroplasts. … Therefore, the plastoquinone pool might act as a pump for a vectorial hydrogen (H+ + e-) transport.
What does Xanthophyll do in plants?
Like other carotenoids, xanthophylls are found in highest quantity in the leaves of most green plants, where they act to modulate light energy and perhaps serve as a non-photochemical quenching agent to deal with triplet chlorophyll (an excited form of chlorophyll), which is overproduced at high light levels in …