Dictionary » P » Plastoquinone



(Science: plant biology) A quinone present in chloroplasts, forming part of the photosynthetic electron transport chain. Closely associated with photosystem II. May be stored in plastoglobuli.

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membrane-bound enzyme?

... also be like the ferrodoxin and the plastocyanin, in which the enzymes are membrane-bound to only one one side of the whole membrane, or even like plastoquinone in which it is inside the membrane). And last is "receptor". The enzyme can have its "active" site on the outside ...

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by kolean
Sun Dec 27, 2009 10:03 pm
Forum: Molecular Biology
Topic: membrane-bound enzyme?
Replies: 9
Views: 12646

Electron transport chain

... the effect of adding strong electron acceptors. What impact would this have on the pH shift if the electron acceptor was able to out compete plastoquinone for electrons? My initial guess after reading chapter 10 of the eighth edition Campbell & Reece Biology text book, is that the pH ...

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by heymanjake
Thu Oct 01, 2009 3:27 am
Forum: Cell Biology
Topic: Electron transport chain
Replies: 1
Views: 1660


the false statement is C. Chlorophyll molecules do not donate protons to anything. P680 donates two electrons to the next acceptor in the chain, plastoquinone. Those electrons travel down through the cytochrome chain to plastocianin to eventually rich P700. P700 can donate electrons to NADP+, ...

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by MrMistery
Fri Nov 28, 2008 8:20 pm
Forum: Molecular Biology
Topic: photosynthesis
Replies: 2
Views: 5766

The Fiber Disease

... ACS). http://www.princeton.edu/~biosolar/ All oxygenic phototrophs extract electrons and protons from water and use them to reduce NADP+ and plastoquinone for use as energy sources for metabolism such as Calvin cycle CO2 fixation and other pathways. However, some microbial oxygenic phototrophs ...

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by London
Wed Aug 30, 2006 6:24 pm
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
Views: 6245544

effect of lead on photosynthesis and respiration

... to Pb ions show a decline in photosynthetic rate which results from distorted chloroplast ultrastructure, restrained synthesis of chlorophyll, plastoquinone and carotenoids, obstructed electron transport, inhibited activities of Calvin cycle enzymes, as well as deficiency of CO2 as a result ...

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by aileen
Sat Jan 28, 2006 6:05 am
Forum: Botany Discussion
Topic: lead and seeding
Replies: 3
Views: 7827

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