Where does electron transfer occur in chloroplast?
thylakoid membrane
All electron-transport processes occur in the thylakoid membrane: to make ATP, H+ is pumped into the thylakoid space, and a backflow of H+ through an ATP synthase then produces the ATP in the chloroplast stroma.
What does cyclic pathway in the chloroplast produce?
This process produces no NADPH and no O2, but it does make ATP. This is called cyclic photophosphorylation. The chloroplast shifts to this process when the ATP supply drops and the level of NADPH rises. ATP is produced through chemiosmosis in both cyclic and non-cyclic photophosphorylation.
What does Anoxygenic photosynthesis produce?
Anoxygenic photosynthesis produces cellular energy ( ATP ), without oxygen as a by-product. As opposed to eukaryotic organisms, which rely on chlorophylls for photosynthesis, anoxygenic organisms rely on bacteriochlorophylls.
What produces reduced electron carriers in chloroplasts?
Nicotinamide adenine dinucleotide phosphate, an energy carrier molecule produced in the light reactions of photosynthesis. NADPH is the reduced form of the electron acceptor NADP+. At the end of the light reactions, the energy from sunlight is transferred to NADP+, producing NADPH.
Where does non cyclic electron flow occur?
Being a light reaction, non-cyclic photophosphorylation occurs in the thylakoid membrane.
What is the flow of electrons during photosynthesis?
Electrons are transferred sequentially between the two photosystems, with photosystem I acting to generate NADPH and photosystem II acting to generate ATP. The pathway of electron flow starts at photosystem II, which is homologous to the photosynthetic reaction center of R.
What is noncyclic electron flow?
In photosynthesis: The pathway of electrons. …and intermediate carriers is called noncyclic electron flow. Alternatively, electrons may be transferred only by light reaction I, in which case they are recycled from ferredoxin back to the intermediate carriers. This process is called cyclic electron flow.
How are cyclic and noncyclic electron flow different?
In cyclic photophosphorylation, the electrons get expelled by photosystem I and they return to the system. On the other hand, in non-cyclic photophosphorylation, the electrons that are expelled by the photosystems do not return.
Is anoxygenic photosynthesis cyclic and non cyclic?
Anoxygenic photosynthesis is a bacterial photosynthesis that occurs under anaerobic conditions, using the photosynthetic electron transport chain in a non–cyclic mode and reduced inorganic electron donors, such as hydrogen sulfide, hydrogen, or ferrous ion, as electron donors.
What uses anoxygenic photosynthesis?
Anoxygenic photosynthesis is carried out by a wide range of bacteria. The chief groups are green sulfur bacteria, such as Chlorobium (which do not use rubisco), green nonsulfur bacteria, such as Chloroflexus, purple sulfur bacteria, such as Thiospirillum, and purple nonsulfur bacteria (e.g., Rhodobacter).
What is produced in cyclic electron flow?
In cyclic electron flow (CEF), electrons are recycled around photosystem I. As a result, a transthylakoid proton gradient (ΔpH) is generated, leading to the production of ATP without concomitant production of NADPH, thus increasing the ATP/NADPH ratio within the chloroplast.
What is produced in noncyclic electron flow?
Noncyclic photophosphorylation involves both Photosystem I and Photosystem II and produces ATP and NADPH. During noncyclic photophosphorylation, the generation of ATP is coupled to a one-way flow of electrons from H2O to NADP+.
