What are the electron carriers used in photosynthesis …

In a broad chemical sense, the opposite of photosynthesis isrespiration. Most of life on this planet (all except in the deepsea vents) depends on the reciprocal photosynthesis-drivenproduction of carbon containing compounds by a series of reducing(adding electrons) chemical reactions carried out by plants andthen the opposite process of oxidative (removing electrons)chemical reactions by animals (and plants, which are capable ofboth photosynthesis and respiration) in which these carboncompounds are broken down to carbon dioxide and water.

What are the electron carriers used in photosynthesis called ..

Chemistry for Biologists: Photosynthesis

LabBench Activity Plant Pigments and Photosynthesis

The cartoon at bottom depicts a "cut-away" chloroplast view. The outerenvelope, as you know, is permeable to metabolites and even small proteins. We focused onthe transporters of the inner envelope of the chloroplast, which is continuous with theextensive membranous system of the interior, a point that we will return to later. As wediscussed before, the aqueous interior of the chloroplast is the stroma, the site of theRPPP. Photosynthetic electron transport occurs in (or across) the thylakoid membranes ofthe interior. These membranes exist as sheets (like the ER), and as the cartoon shows,they enclose a lumen ("cavity"). By way of review, then, there are three aqueousspaces: (1) the space between the envelope membranes, (2) the stroma, and (3) thethylakoid lumen. As you will see, the thylakoid membranes not only harvest light, but theyseparate two regions in which the electrochemical potentials of H+ differconsiderably as a consequence of electron transport. At this point, please note that thereis considerable organization in the interior membranes: Some sheets traverse the stroma,("stromal lamella") and are not associated with others. Some of the membranesform stacks; stacks of thylakoids are called grana (sing. granumfromthe grainy appearance in the light microscope).

IB Biology Notes - 8.2 Photosynthesis

As mentioned in the introduction, we will discuss four major components of thephotosynthetic electron transport system. These components are shown as the differentsymbols keyed in the upper right hand corner of the diagram. Two techniques(freeze-fracture and two-phase polymer systems that enable investigators to isolatephysically very similar biological structures [such as the different chloroplast membranesor the cis vs. trans faces of Golgi] have shown that the four components are not equallydistributed through out the membranes. To facilitate our later discussions, I would ask you to commit to memory now: (1) The ATPase and PSI are localizedexclusively in the non-appressed regions. (2) PSII is localized mostly in the appressedregions. (3) The b-f complex is abundant in both the appressed and non-appressed regions.

27/12/2017 · electron carrier Any of various molecules that are capable of accepting one or two ..
During the first stage of photosynthesis, two _____ are passed from molecule to molecule down the electron ..

Chemistry for Biologists: Respiration

14The "inward-facing" N atoms of the cytochromes are coordinatedwith an atom of Fe2+ (reduced state) or Fe3+ (oxidized) state. Theyare electron carriers and function variously in biological systems. Our focus, onphotosynthetic electron transport, will be on their use as electron carriers that shuttleelectrons from PSII to PSI (b-f complex). At this point, it useful for you totake note of the fact that some substances, like cytochrome, are oxidized and reducedsimply by electrons. Others that we will discuss later involve an H-atom (i.e., a H+in addition to the electron). Yet others, like NADP+ NADPH,involve an unequal number of electrons and protons.

01/12/2015 · D NADH produced in glycolysis 8 Two electron carriers that are important in from BIOLOGY SBI4U at Holy Trinity High School, Bradford

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The reduction of QB to the hydroquinone requires not only electrons, butprotons, also. These protons are taken up from the stromal side of the membrane. When QBis oxidized by a complicated cycle, a total of four (?) H+s are released intothe lumen. This contribution to the pH is thesecond energy conservation site. QB is the first of two mobile carriers that wewill discuss.

When chlorophyll a absorbs light energy, an electron gains energy and is 'excited'

28/12/2017 · Electron carrier used in photosynthesis

As mentioned in the introduction, we will discuss four major components of thephotosynthetic electron transport system. These components are shown as the differentsymbols keyed in the upper right hand corner of the diagram. Two techniques(freeze-fracture and two-phase polymer systems that enable investigators to isolatephysically very similar biological structures [such as the different chloroplast membranesor the cis vs. trans faces of Golgi] have shown that the four components are not equallydistributed through out the membranes. To facilitate our later discussions, I would ask you to commit to memory now: (1) The ATPase and PSI are localizedexclusively in the non-appressed regions. (2) PSII is localized mostly in the appressedregions. (3) The b-f complex is abundant in both the appressed and non-appressed regions.