At a fundamental level, water provides electrons to replace those removed from chlorophyll in photosystem II. Also, water produces oxygen as well as reduces NADP to NADPH (required in the Calvin cycle) by liberating H+ ions
During the process of photosynthesis, six molecules of carbon dioxide and six molecules of water react in the presence of sunlight to form one glucose molecule and six molecules of oxygen. The role of water is to release oxygen (O) from the water molecule into the atmosphere in the form of oxygen gas (O2).
Water also has another important role of being an electron feeder. In the process of photosynthesis, water provides the electron that binds the hydrogen atom (of a water molecule) to the carbon (of carbon dioxide) to give sugar (glucose).
Water acts as a reducing agent by providing H+ ions that convert NADP to NADPH. Since NADPH is an important reducing agent present in chloroplasts, its production results in a deficit of electrons, resulting from oxidation of chlorophyll. This loss of electron must be fulfilled by electrons from some other reducing agent. Photosystem II involves the first few steps of the Z-scheme (the diagram of the electron transport chain in photosynthesis) and therefore a reducing agent that can donate electrons is required to oxidize chlorophyll, which is provided by water (acting as a source of electrons in green plants and cynobacteria). Hydrogen ions thus released create a chemical potential (chemiosmotic) across the membrane that finally results in synthesis of ATP. Photosystem II is the primary known enzyme that acts as catalyst in this oxidation of water.
Answer:
All cells has the same DNA but sum are different The differences depend on what parts of the DNA the cell uses in a process called gene expression. Gene expression can be influenced by environmental factors, and influences from the environment can further affect the phenotype in other ways.
Explanation:
Gene expression depends on a constant dialogue between the nucleus and the cytoplasm by University of Geneva Gene expression is the process by which genetic information is used to produce proteins, which are essential for cells to function properly and fulfil their many purposes.
Well teens can have it and not know it cause of there parents but thats rear and some teens can get it cause we have more then one sexual partner. so to help prevent the spread by using condoms.
Answer:
Anoche bebí una cerveza artesanal, hecha por un amigo (1 D.) que produce su cerveza con maltas provenientes de Querétaro (3 I.D.).
Desayuné pan, comprado en una tienda que no lo produce (1 D, 2 I.D), con mermelada de zarzamoras, hecha por un amigo (1 D.) que compró larga cantidad de zarzamoras - es temporada de zarzamoras.
Luego bebí un café, con café orgánico de Chiapas que una asociación de comercio justo me provee (5 D, 3 I.D).
La comida eran nopales (1 D, 3 I.D) con queso oaxaca. Los nopales (familia de cactus) crecen por doquier en nuestro estado. El queso oaxaca (1 D. 4 I.D.) compramos en una tienda colectiva y no está hecho en Oaxaca sino aquí.
La cena consistió de unos tamales oaxaqueños (2 D, 5 I.D) con hojas de plátano,masa de maíz, mole y pollo. sólo el último ingrediente tiene dudosa procedencia.
Ah! Compré una botella de limoncello (licor italiano de limon) que un amigo (1 D) francés hace con su propia cosecha de limones.
Explanation:
D = Directo
I.D. = Indirecto
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