What is PS2 in biology?
Photosystem II (or water-plastoquinone oxidoreductase) is the first protein complex in the light-dependent reactions of oxygenic photosynthesis. It is located in the thylakoid membrane of plants, algae, and cyanobacteria.
What is ps1 and PS2 in biology?
The two photosystems are Photosystem I and Photosystem II. Both these photosystems PS I and PS II are multi-subunit membrane-protein complexes participating in oxygenic photosynthesis. The pigment that is mainly involved in trapping light energy is chlorophyll. Thus, it is called a pigment system or photosystem.
What is the role of ps1 and PS2 in photosynthesis?
PS I and PS II are the two photosystems which drive the light reaction of photosynthesis. The first stage of the light reaction occurs in PS II whereas the final stage of the light reaction occurs in PS I. Each of the two photosystems are made up of a collection of proteins and pigments.
What does the photosystem 2 do?
Photosystem II is the first link in the chain of photosynthesis. It captures photons and uses the energy to extract electrons from water molecules.
What is PSI and PSII?
Photosystem I (PSI) and Photosystem II (PSII) harvest light energy to drive photosynthesis. In plants these photosystems are composed of a core complex and a peripheral antenna system.
Does photosystem 2 produce ATP?
This is accomplished by the use of two different photosystems in the light reactions of photosynthesis, one to generate ATP and the other to generate NADPH. Electrons are transferred sequentially between the two photosystems, with photosystem I acting to generate NADPH and photosystem II acting to generate ATP.
What are three main differences between photosystem 1 and photosystem 2?
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| Photosystem I (PS I) | Photosystem II (PS II) |
|---|---|
| Pigments absorb longer wavelengths of light (>680nm). | Pigments absorb shorter wavelengths of light (<680nm). |
| Rich in chlorophyll a than chlorophyll-b | Rich in chlorophyll b than chlorophyll-a |
Where is photosystem 1 and 2 found?
thylakoid membranes
Photosystem I (PS I) and II (PS II) are found in the thylakoid membranes inside the chloroplast. The photosystems are responsible for carrying out photochemical phase or light reaction of photosynthesis.
Is ATP produced in photosystem 1 or 2?
What is the function of photosystem II quizlet?
Photosystem II triggers chemiosmosis and ATP synthesis in the chloroplast. Electrons are passed from the reduced pheophytin to an electron transport chain in the thylakoid membrane. This ETC is similar in structure and function to the ETC in mitochondria.
What do photosystem 1 and 2 have in common?
There are two types of photosystems: photosystem I (PSI) and photosystem II (PSII). Both photosystems contain many pigments that help collect light energy, as well as a special pair of chlorophyll molecules found at the core (reaction center) of the photosystem.
What is the product of photosystem 2?
Photosystem II is the first membrane protein complex in oxygenic photosynthetic organisms in nature. It produces atmospheric oxygen to catalyze the photo-oxidation of water by using light energy. It oxidizes two molecules of water into one molecule of molecular oxygen.
What are the two main components of PSII?
Structure of PSI and PSII
Each photosystem has two main subunits: an antenna complex (a light harvesting complex or LHC) and a reaction center. The antenna complex is where light is captured, while the reaction center is where this light energy is transformed into chemical energy.
What is the function of photosystem 1?
Photosystem I receives electrons from plastocyanin or cytochrome c6 on the lumenal side of the thylakoid membrane and uses light energy to transfer them across the membrane to ferredoxin on the stromal side. It can also function in a cyclic electron transport pathway.
What is the role of photosystem 1?
Photosystem I is an integral membrane protein complex that uses light energy to catalyze the transfer of electrons across the thylakoid membrane from plastocyanin to ferredoxin. Ultimately, the electrons that are transferred by Photosystem I are used to produce the moderate-energy hydrogen carrier NADPH.
What is the difference between PSII and PSI?
Even though PSI and PSII coordinate the same set of pigments, their absorption spectra differ. PSI coordinates several Chls that absorb light at wavelengths longer than 700 nm, while PSII is enriched in Chl b and therefore shows stronger absorption around 475 nm and 650 nm [1].
What are the products of photosystem 2?
How does photosystem 2 generate ATP?
Electron transport through photosystem II is thus coupled to establishment of a proton gradient, which drives the chemiosmotic synthesis of ATP.
What is the main product of photosystem 2?
Which statement best describes the function of photosystem 2?
Light energy excites electrons in the electron transport chain in a photosynthetic unit. No worries!
Does photosystem 1 or 2 come first?
There are two types of photosystems in the light-dependent reactions, photosystem II (PSII) and photosystem I (PSI). PSII comes first in the path of electron flow, but it is named as second because it was discovered after PSI.
Which of the following is a function of photosystem II quizlet?
What is photosystem in biology?
Photosystems are the functional units for photosynthesis, defined by a particular pigment organization and association patterns, whose work is the absorption and transfer of light energy, which implies transfer of electrons. Physically, photosystems are found in the thylakoid membranes.
Why is it called photosystem 2?
Photosystem II is named as such since it is discovered after photosystem I. Their names do not represent the electron flow as it begins in photosystem II I (i.e. when both of them are present in the organism, e.g plants and algae).
What is ps1 in biology?
Photosystem I is an integral membrane protein complex that uses light energy to catalyze the transfer of electrons across the thylakoid membrane from plastocyanin to ferredoxin.