Does photosystem 2 produce ATP and NADPH?
Does photosystem 2 produce ATP and NADPH?
The passage of electrons through photosystems I and II thus generates both ATP and NADPH, which are used by the Calvin cycle enzymes in the chloroplast stroma to convert CO2 to carbohydrates (see Figure 2.39).
What does the photosystem 2 produce?
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.
Where are NADPH and ATP produced?
stroma
The light reactions take place in the grana of the chloroplast. The light reactions produce ATP and NADPH, and also split water molecules to produce oxygen. This takes place in the stroma of the chloroplast.
Does photosynthesis produce ATP and NADPH?
There are two main stages of photosynthesis: the light-dependent reactions and the Calvin cycle. They require light, and their net effect is to convert water molecules into oxygen, while producing ATP molecules—from ADP and Pi—and NADPH molecules—via reduction of NADP+.
What does photosystem I produce?
Ultimately, the electrons that are transferred by Photosystem I are used to produce the high energy carrier NADPH. The combined action of the entire photosynthetic electron transport chain also produces a proton-motive force that is used to generate ATP.
How many ATP and NADPH are produced in light reactions?
The nine molecules of ATP and six molecules of NADPH come from the light reactions.
How is ATP synthesis coupled with the reactions of photosystem II?
How is ATP synthesis coupled with the reactions of Photosystem II? By creating a hydrogen ion gradient to be used with ATP synthase.
What is a photosystem and where are they found?
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.
What happens to the free energy released as electrons are passed from photosystem II to photosystem I through a series of electron carriers?
What happens to the free energy released as electrons are passed from photosystem II to photosystem I through a series of electron carriers? It is used to establish and maintain a proton gradient.
What are the role of ATP and NADPH in photosynthesis?
ATP and NADPH are energy storage and electron carrier/donor molecule. Both ATP and NADPH are used in the next stage of photosynthesis. The chlorophyll molecule regains the lost electron from a water molecule through a process called photolysis, which releases dioxygen (O2) molecule.
Does photosystem produce NADPH?
Photosystem I (PSI, or plastocyanin–ferredoxin oxidoreductase) is one of two photosystems in the photosynthetic light reactions of algae, plants, and cyanobacteria. Ultimately, the electrons that are transferred by Photosystem I are used to produce the high energy carrier NADPH.
How does photosynthesis produce ATP?
The ATP is produced during the light reaction of photosynthesis by photophosphorylation. ATPs are produced towards the stromal side of the thylakoid membrane. In the formation of one glucose molecule, 18 ATP and 12 NADPH molecules are utilised in the six turns of the Calvin cycle. …
How is ATP and NADPH produced in photosynthesis?
ATP and NADPH are produced by photosystems I and II in the presence of light. The reactions that produce sugar from carbon dioxide in the Calvin cycle are light-independent. These reactions require the ATP and NADPH produced by the light-dependent reactions.
What is false photosynthesis and true photosynthesis?
False Photosynthesis is the process of converting light energy into the chemical energy of a molecule of glucose. True ATP molecules are produced during the light independent reactions of photosynthesis.
How are electrons from Photosystem 1 accepted by NADP+?
Electrons from photosystem I are passed down an electron transport chain and are accepted by NADP+ to form NADPH. How are electrons that are lost by the chlorophyll molecules replaced? The replacement electrons come from the splitting of water molecules.
What is the reaction between photosystem I and photosystem II?
One part of the reaction is the reduction of NADP+ to NADPH, carried out by photosystem I (PSI). The second part of the reaction is the oxidation of water to produce oxygen, carried out by photosystem II (PSII). Both photosystems carry out redox (electron transfer) reactions.
