0
Sequence of Events:a. Light is absorbed by Bchl in the antenna.
b. Energy is transferred to P960 which is a pair of special Bchl b molecules in the reaction center. (P960 means pigment with absorption maximum at 960nm)
c. P960 becomes excited. The excited state, P960*, lasts less than one picosecond (pico = 10-15).
d. P960 loses an electron to one of the other Bchl bmolecules in the reaction center.
e. The electron is rapidly passed on to Bphe. Bphe is a chlorophyll derivative where Mg2+ is replaced by 2H+. The transient existence of the biradical (Bchl)2+....Bphe- is detectable by its spectrum.
f. The electron is transferred from Bphe to firmly bound ubiquinone, UQA, to give the half-reduced form (the anionic semiquinone). [UQA is never fully reduced and never gains protons to become UQH2.]
g. The electron goes from UQA to the loosely bound ubiquinone, UQB. UQB waits for a second electron and also picks up two protons from water so becoming UQH2.
h. UQBH2 moves out of the reaction center, travels through the lipid bilayer, and transfers its electrons to the cytochrome bc1 complex.
i. Cytochrome bc1 transfers electrons to cytochrome c2 which is a soluble periplasmic protein.
j. The electrons are transferred from cytochrome c2 to reaction center protein C and travel successively via its four hemes back to P960+.
Please refer to related link for the original article
What else can I help you with?
What is the first most immediate thing that happens when light strikes a chlorophyll molecule?
When light strikes a chlorophyll molecule, electrons in the chloroplast get excited.
What is the term for the particles of light that provide the energy needed for photosynthesis?
Photon
What is the role of chlorophyll a?
Chlorophyll a is a pigment molecule that plays a crucial role in photosynthesis. It absorbs light energy from the sun and converts it into chemical energy used to drive the synthesis of carbohydrates from carbon dioxide and water. This process is essential for sustaining plant and algal life.
Light absorption requires the presence of?
molecules or particles that can absorb photons of light. These molecules have electrons that can be excited by the incoming photons, leading to the absorption of light. Without such molecules or particles, light would simply pass through without being absorbed.
What kind of energy does photosynthesis need?
Photosynthesis requires light energy in the form of photons. These photons are absorbed by chlorophyll in the chloroplasts of plant cells, providing the energy needed to convert carbon dioxide and water into glucose and oxygen.
During photosynthesis photons raise electrons to higher energy levels. These excited electrons belong to what compound?
During photosynthesis, the excited electrons primarily belong to chlorophyll, the green pigment in plants. When chlorophyll absorbs photons, it elevates electrons to higher energy levels, initiating the process of converting light energy into chemical energy. This energy is subsequently used to drive the synthesis of glucose from carbon dioxide and water.
Which substance is a green molecule in chloroplast that absorbs photons?
Chlorophyll is the green pigment in chloroplasts that absorbs photons during photosynthesis.
How plants turn sunlight unto energy?
Seriously oversimplifying it, chlorophyll in the plant absorbs photons in the sunlight creating an excited state. As the excited state relaxes electrons are transfered to break up water and carbon dioxide and recombine them into glucose and oxygen.
What are the steps when a rod is excited by photons of light?
When a rod is excited by photons of light, the photons are absorbed by the atoms in the rod, causing the electrons in the atoms to jump to higher energy levels. This results in the electrons becoming excited. As the excited electrons return to their lower energy states, they emit photons of light at specific wavelengths, a process known as fluorescence or luminescence.
What is the function of the chlorophyll in the leaves of plants?
it grabs the photons from the sun and use these photons to produce sugars or enegry for them.
Where do electrons get there energy from photostem 2?
Electrons in photosystem II get their energy from sunlight. When photons from sunlight are absorbed by the chlorophyll molecules in the photosystem, the energy is transferred to electrons, allowing them to become excited and drive the process of photosynthesis.
What gets excited when chlorophyll absorbs a photon?
electrons
What are the special qualities of chlorophyll a?
Chlorophyll a can absorb solar energy, but only a few in the excited state of chlorophyll a can convert light energy into electricity.
What event accompanies energy absorption by chlorophyll?
An electron is excited
A pigment that absorbs primarily red and blue photons of light for photosynthesis?
chlorophyll
What causes an electron in the thylakoid membrane to leave the chlorophyll?
An electron in the thylakoid membrane leaves the chlorophyll when it absorbs energy from photons of light, typically during the process of photosynthesis. This energy excites the electron, raising it to a higher energy level, which allows it to escape from the chlorophyll molecule. This excited electron is then transferred through a series of proteins in the electron transport chain, ultimately contributing to the production of ATP and NADPH.
When chlorophyll absorbs light energy what happens to its electrons?
It becomes excited.
