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Dictionary » P » Photosystem I

Photosystem I

Definition

noun

The photosystem that makes use of light to transfer electron particualrly from plastocyanin to ferredoxin, and whose reaction center chlorophyll is P700.


Supplement

Photosystem I is named I because it is first discovered before photosystem II. In fact, in plants and algae where two photosystems exist, the flow of electron begins at photosystem II.

Compared with photosystem II, the photosystem I is more complex in structure. It has a more complex antenna system, has more subunits in its overall structure, and may exhibit cyclic or non-cyclic electron transfer from the excited P700 to the electron acceptor.


Abbreviation: PS I

Compare: photosystem II

See also: P700


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Photosynthesis question

... if you did look it up, you could easily find your answers. lights at frequencies of 680 and 700 are best for chlorophylls a and b, hence the names photosystem I and II (P700 and p680), had you the time to look them up. and as for this question.... you are correct, which I thought, but verified ...

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by plasmodesmata11
Sun Apr 05, 2009 11:28 pm
 
Forum: Ecology
Topic: Photosynthesis question
Replies: 6
Views: 766

wavelength in photosynthesis

look up the term "photosystem"

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by plasmodesmata11
Sun Apr 05, 2009 9:24 pm
 
Forum: Ecology
Topic: wavelength in photosynthesis
Replies: 2
Views: 732

Does anything affect absorption spectrum of chlorophyll?

... you look into molecular orbitals, HOMO-LUMO, quantum mechanics and all that jazz. but the long story made short is that because chl is in a photosystem complexed with proteins and other molecules rather than in solution, it has very different behaviours. think of it: chl a in photosystem ...

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by MrMistery
Thu Mar 05, 2009 2:17 am
 
Forum: Botany Discussion
Topic: Does anything affect absorption spectrum of chlorophyll?
Replies: 9
Views: 2133

Photosynthesis question

... for your response!!!!!!!!!!! :) so my textbook was wrong???????? oh well... :( wait! The wiki says that the OEC (oxygen evolving complex - part of photosystem II - the same complex that does photolysis, is an enzyme). I think I get it now. Thanks for everyone who replied!!!!!!!!!!!!!! :)

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by thewax
Sun Dec 28, 2008 5:52 pm
 
Forum: Cell Biology
Topic: Photosynthesis question
Replies: 3
Views: 544

Electrons in photosystem II

I've never heard of PS11. It is probably a misspelling of PSII(photosystem II).

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by MrMistery
Sat Dec 06, 2008 3:20 pm
 
Forum: Botany Discussion
Topic: Electrons in photosystem II
Replies: 6
Views: 3330
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