What are the sources of electrons in photosynthesis and respiration?

[RainGurl]

I am not sure about sources of electrons in photosynthesis and respiration.

If someone can explain this that would be great??
I think the source of electrons for photosynthesis would be water and light. Am I correct?

Still reading about respiration...

Also occurrence in photosynthesis and respiration...

This would be how things "occur" in photosynthesis and respiration right?

 

[Moonbear]

To get help with your assignments/coursework here, you need to first tell us what you DO know. We can then help you from there once we know where the confusion begins.

 

[Astronuc]

Perhaps this would answer the question - http://en.wikipedia.org/wiki/Electron_transport_chain

The Krebs cycle refers the chemical reactions in cellular respiration.
http://en.wikipedia.org/wiki/Cellular_respiration
http://en.wikipedia.org/wiki/Citric_acid_cycle aka Krebs cycle
http://en.wikipedia.org/wiki/Oxidative_phosphorylation

http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/C/CellularRespiration.html

http://biology.clc.uc.edu/courses/bio104/cellresp.htm

IIRC the electrons are taken from H-atoms: H -> H⁺ + e^-.



http://en.wikipedia.org/wiki/Photosynthesis

See also - http://photoscience.la.asu.edu/photosyn/education/ps_art/wimsketch.gif
in http://photoscience.la.asu.edu/photosyn/education/photointro.html