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P700

Definition

noun

The reaction center chlorophyll (or the primary electron donor) of photosystem I that is most reactive and best in absorbing light at wavelength of 700 nm.


Supplement

P700 consists of a group of pigments acting as a single entity or like a single molecule when it receives excitation energy. It is named after the wavelength (in nanometers) of their red-peak absorption maximum, which in this case, is the deep-red or 700 nm.


Compare: P680
See also: photosystem I


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Antenna Pigments and short wavelength light

... has E = 1.77 eV 400 nm light (violet) has E = 3.1 eV If we use only 1.77 eV of a violet photon, the remaining 1.33 eV is not enough to funnel into P700. So, is it lost as heat? 1.33 eV is 932 nm which is in the infra-red. Thanks.

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by pingrybioguy
Fri May 14, 2010 1:53 pm
 
Forum: Botany Discussion
Topic: Antenna Pigments and short wavelength light
Replies: 3
Views: 3619

Photosynthesis question

... 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 with a TEXTBOOK

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by plasmodesmata11
Sun Apr 05, 2009 11:28 pm
 
Forum: Ecology
Topic: Photosynthesis question
Replies: 6
Views: 6467

Light-dependent Reaction Questions

2. Yes, it is the electron from photosystem I(P700) that is used to reduce NADP+. 3. There is nothing different about the chl a molecules. Chl a is chl a, and they all have the same structure. However, because they are surrounded by different proteins, ...

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by MrMistery
Sat Dec 06, 2008 3:18 pm
 
Forum: Botany Discussion
Topic: Light-dependent Reaction Questions
Replies: 3
Views: 6761

photosynthesis

... 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+, converting it to NADPH. The protons in this reaction are taken up from the solution, where they are readily ...

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by MrMistery
Fri Nov 28, 2008 8:20 pm
 
Forum: Molecular Biology
Topic: photosynthesis
Replies: 2
Views: 5271

Light-dependent Reaction Questions

... the decrease in mols of (H+) after this redox reaction contribute to the lower concentration of H+ in the stroma? 2. Is the electron from the P700 chlorophyll a molecule furthered into the electron transport chain (passing through Fd and NADP+ reductase) the same electron from photosystem ...

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by vertciel
Sat Oct 25, 2008 3:17 pm
 
Forum: Botany Discussion
Topic: Light-dependent Reaction Questions
Replies: 3
Views: 6761
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