What are the differences between PSI and PSII?
Here are some of the key differences between the photosystems: Special pairs. The chlorophyll a special pairs of the two photosystems absorb different wavelengths of light. The PSII special pair absorbs best at 680 nm, while the PSI special absorbs best at 700 nm.
What is the main difference between the two photosystems?
The main difference between photosystem 1 and 2 is that PS I absorbs longer wavelengths of light (>680 nm) whereas PS II absorbs shorter wavelengths of light (<680 nm).
What does PSII do?
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 is PSII and PSI?
Safe and efficient function of the photosynthetic light reactions is based on synchronized function of the light-driven enzymes photosystem II (PSII) and photosystem I (PSI), the former splitting water to protons and electrons and the latter using electrons to reduce NADP to NADPH.
What is the difference between C3 and C4 plants?
C3 plants use the C3 pathway or Calvin cycle for the dark reaction of photosynthesis. C4 plants use the C4 pathway or Hatch-Slack Pathway for the dark reaction of photosynthesis. These plants are cool-season plants, commonly found in cool and wet areas. These plants are warm-season plants, commonly found in dry areas.
What is the difference between chlorophyll a and chlorophyll b?
Both are involved in the process photosynthesis. The main difference between chlorophyll A and B is their role in photosynthesis; chlorophyll A is the principal pigment involved in the photosynthesis whereas chlorophyll B is the accessory pigment, collecting the energy in order to pass into chlorophyll A.
How does PSII split water?
Photosystem 2 (PS2) is the part of the photosynthetic apparatus that uses light energy to split water releasing oxygen, protons and electrons.
What molecules are made in PSII?
PSII serves as a light-driven water-plastoquinone oxidoreductase, which extracts electrons from water to fuel the PET chain, and produces molecular oxygen as a by-product.
What is the absorption maxima of PSII?
about 683 nm
One of them has its absorption maximum at about 683 nm and is responsible for the prominent shoulder that is present in the 10 K absorption spectra of most PSII-RC preparations.
Why do plants have 2 photosystems?
Due to the large difference in the redox potential between the electron donor (oxygen in a water molecule) and final electron acceptor during the light phase of photosynthesis (NADP+), the ancestor cyanobacteria had to evolve the capability to use two photosystems working in series in order to be able to accumulate the …
What is the main difference between C3 and C4 carbon fixation?
In C3 plants, the carbon dioxide fixation takes place only at one place. In C4 plants, the carbon dioxide fixation takes places twice (one in mesophyll cells, second in bundle sheath cells). C3 plants possess only one CO2 acceptor. C4 plants possess two CO2 acceptors (primary acceptor and secondary acceptor).
How are PSII and PSI similar in function?
The PSII and PSI photosynthetic complexes are very similar in eukaryotic algae (and plants) and cyanobacteria, as are many elements of the light capture, electron transport, and carbon dioxide (CO 2) fixation systems.
What’s the difference between PS I and PS II?
Secondly, each photosystem is replenished by the electrons, after the loss of an electron, but the sources are different where PS II gets it electrons from water while PS I gains electrons from the PS II through an electron transport chain.
How many subunits are in the core of PSII?
The core of PSII is a multi-subunit complex composed of about ~25-30 subunits. Pigments absorb longer wavelengths of light (>680nm).
How are psi and Psi photosynthetic complexes similar?
PSII and PSI: Structure, Function and Organization. PSII and PSI: Structure, Function and Organization. The PSII and PSI photosynthetic complexes are very similar in eukaryotic algae (and plants) and cyanobacteria, as are many elements of the light capture, electron transport, and carbon dioxide (CO2) fixation systems.