What is the main function of photosystem II?

Asked By: Arely Stehlin | Last Updated: 19th January, 2020
Category: science chemistry
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The most important function of photosystem II (PSII) is its action as a water-plastoquinone oxido-reductase. At the expense of light energy, water is split, and oxygen and plastoquinol are formed.

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Also, what is the function of photosystem 2?

Photosystem II (PS II) is a pigment-protein complex in thylakoid membranes from all oxygenic photosynthetic organisms (cyanobacteria and photosynthetic eukaryotes). It catalyzes the light-induced reduction of plastoquinone by water through a number of redox reactions.

Subsequently, question is, what is the main role of photosystem I? Photosystem I (PSI, or plastocyanin-ferredoxin oxidoreductase) is the second photosystem in the photosynthetic light reactions of algae, plants, and some bacteria. Photosystem I is an integral membrane protein complex that uses light energy to produce the high energy carriers ATP and NADPH.

Accordingly, what is the function of photosystem 1 and 2?

Photosystem I and II and the Light Reaction The purpose of these photo systems is to collect energy over a "broad" range of wavelengths and concentrate it to one molecule called a reaction center which uses the energy to pass one of its electrons on to a series of enzymes.

What are the functions of photosystem I and photosystem II in plants?

Photosystem I and photosystem II are the two multi-protein complexes that contain the pigments necessary to harvest photons and use light energy to catalyse the primary photosynthetic endergonic reactions producing high energy compounds.

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What is the difference between photosystem 1 and 2?

The two main multi-subunit membrane protein complexes differ in their absorbing wavelength, where the photosystem I or PS 1 absorbs the longer wavelength of light which is 700 nm while photosystem II or PS 2 absorbs the shorter wavelength of light 680 nm.

Why is it called photosystem 2?

photosystem II. 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.

What is produced in 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 does p680 stand for?

P680, or Photosystem II primary donor, (where P stands for pigment) refers to either of the two special chlorophyll dimers (also named special pairs), PD1 or PD2.

What is the end product of photosystem II?


Cards
Term Energy Definition The ability to do work
Term What are the product(s) of photosystem II? Definition oxygen ATP
Term What are the product(s) of photosystem I? Definition NADPH
Term When does photolysis occur? Definition photosystem II
Term When does photophosphorylation occur? Definition photosystem II

Why is RuBP important?

Atmospheric CO2 is combined with RuBP to form a 6 carbon compound, with the help of an enzyme (biological catalyst) called RuBisCo. Hence the importance is that it's part of the cycle that enables plants to 'fix' carbon from the atmosphere and convert into photosynthetic products (carbohydrate, proteins, fats).

Where does photosystem 2 get its electrons?

It is located in the thylakoid membrane of plants, algae, and cyanobacteria. Within the photosystem, enzymes capture photons of light to energize electrons that are then transferred through a variety of coenzymes and cofactors to reduce plastoquinone to plastoquinol.

Where are photosystem 1 and 2 found?

Photosystems are found in the thylakoid membranes of plants, algae and cyanobacteria. They are located in the chloroplasts of plants and algae, and in the cytoplasmic membrane of photosynthetic bacteria. There are two kinds of photosystems: II and I.

Is ATP produced in photosystem 1 or 2?

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 is the first thing that happens in photosynthesis?


During the first stage of photosynthesis, called the light-dependent reaction, sunlight excites the electrons in the chlorophyll pigment. The organism uses this energy to create the energy carrier molecules ATP and NADPH, which are crucial for carbon fixing during the second stage.

What is the Nadph responsible for?

Reduced nicotinamide adenine dinucleotide phosphate (NADPH) is an essential electron donor in all organisms. It provides the reducing power that drives numerous anabolic reactions, including those responsible for the biosynthesis of all major cell components and many products in biotechnology.

What happens during the Calvin cycle?

The Calvin cycle is part of photosynthesis, which occurs in two stages. In the first stage, chemical reactions use energy from light to produce ATP and NADPH. In the second stage (Calvin cycle or dark reactions), carbon dioxide and water are converted into organic molecules, such as glucose.

What is the difference between photosystem I and photosystem II quizlet?

What is the difference between Photosystem II and Photosystem I? Photosystems II and I have different chlorophylls. PS II has P680 and PS I has P700. Photosystem II comes before Photosystem I.

What is the purpose of the Calvin cycle?

Converting Carbon Dioxide and Water Into Glucose
In the most general sense, the primary function of the Calvin cycle is to make organic products that plants need using the products from the light reactions of photosynthesis (ATP and NADPH).

Where does the Calvin cycle occur?


Unlike the light reactions, which take place in the thylakoid membrane, the reactions of the Calvin cycle take place in the stroma (the inner space of chloroplasts). This illustration shows that ATP and NADPH produced in the light reactions are used in the Calvin cycle to make sugar.

Is ATP the product of photosystem 1?

ATP is the product of photosystem I. 5. ATP and NADPH are two types of protein carriers.

Where is water split in photosynthesis?

The enzyme complex that catalyzes the water-splitting reaction (known as the oxygen-evolving complex) contains manganese and calcium, and is located in photosystems embedded in thylakoid membranes within the chloroplast.