Splitting H2O (Apex)
No. Photosystems I and II are where light-dependent reactions occur, while the Calvin Cycle is where light-independent reactions occur. Photosynthesis begins with Photosystem II, then Photosystem I, then the products from there go to the Calvin Cycle. (yes photosystem II comes before photosystem I)
to make energy-carrier molecules like NADPH Apex
Water participates directly in the light reactions of photosynthesis by donating electrons to photosystem II during the process of photolysis. These electrons are used to replace the ones lost by chlorophyll when it absorbs light energy, allowing the photosystem to continue absorbing light and generating ATP and NADPH for the Calvin cycle.
Photosystem II plays a role in absorbing light energy and initiating the process of photosynthesis by passing electrons through the electron transport chain. It also splits water molecules to release oxygen as a byproduct.
donating electrons to photosystem II
Splitting H2O (Apex)
Excitation of electrons in photosystem II.
Plastocyanin is a copper-containing protein that plays a crucial role in photosynthesis by shuttling electrons between photosystem II and photosystem I in the thylakoid membrane of chloroplasts. It helps in the transfer of electrons during the light-dependent reactions of photosynthesis.
Photosystem I (PSI) plays a crucial role in the light reactions of photosynthesis by absorbing light energy and facilitating the conversion of that energy into chemical potential. It primarily focuses on the reduction of NADP+ to NADPH, which is essential for the Calvin cycle. PSI works in conjunction with photosystem II (PSII) and receives electrons from the electron transport chain, ultimately contributing to the formation of ATP and NADPH, the energy carriers used in the synthesis of glucose during the light-independent reactions.
Photosystem I and Photosystem II are two protein-based complexes found in the thylakoid membrane of chloroplasts in plants, algae, and cyanobacteria. They are involved in the process of photosynthesis, capturing and converting light energy into chemical energy. Photosystem II functions first in the light reactions of photosynthesis, while Photosystem I follows to further harness light energy and produce ATP and NADPH, which are vital for the synthesis of sugars.
Photosystem I absorbs light best at a wavelength of 700 nm, while Photosystem II absorbs light best at a wavelength of 680 nm. Photosystem I transfers electrons to reduce NADP+ to NADPH, while Photosystem II replenishes electrons lost in the process of photosynthesis. Both photosystems work together in the light-dependent reactions of photosynthesis to ultimately produce ATP and NADPH.
Oxygen is produced during the light reactions of photosynthesis when water molecules are split by the photosystem II complex. This process releases oxygen as a byproduct.