Sources of Electrons in Photosynthesis & Respiration

In summary, the sources of electrons in photosynthesis are water and light, and for respiration, they are taken from hydrogen atoms. The Krebs cycle is also involved in cellular respiration, while for photosynthesis, there is a process called oxidative phosphorylation. It is important to understand the basic processes and concepts before seeking further help with assignments or coursework.
  • #1
RainGurl
8
0
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?
 
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  • #2
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.
 
  • #3
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
 
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1. What are the main sources of electrons in photosynthesis?

The main sources of electrons in photosynthesis are water and the photosystem II complex. In the light reactions of photosynthesis, light energy is used to split water molecules, releasing electrons, protons, and oxygen. These electrons are then used to replenish the electrons lost by the photosystem II complex, which is responsible for capturing light energy.

2. How do plants obtain electrons for respiration?

Plants obtain electrons for respiration from the breakdown of glucose molecules. During photosynthesis, plants use light energy to convert carbon dioxide and water into glucose and oxygen. This glucose is then broken down in the process of cellular respiration, releasing electrons that are used to produce ATP, the main source of energy for cellular processes.

3. Can other substances besides water be used as a source of electrons in photosynthesis?

Yes, other substances such as hydrogen sulfide, hydrogen, and various organic compounds can also be used as sources of electrons in photosynthesis. These alternative electron donors are commonly used by bacteria and other organisms that perform photosynthesis in environments where water is scarce.

4. How are electrons transferred during photosynthesis and respiration?

Electrons are transferred through a series of reactions and electron carriers in both photosynthesis and respiration. In photosynthesis, electrons are transferred from water to the photosystem II complex, then to the photosystem I complex, and finally to the electron carrier NADP+. In respiration, electrons are transferred from glucose to the electron carrier NADH, and then to the electron transport chain to produce ATP.

5. What role do pigments play in the photosynthetic process?

Pigments, such as chlorophyll, play a crucial role in photosynthesis by absorbing light energy and transferring it to the photosynthetic reaction centers. These reaction centers use the energy from the pigments to transfer electrons and protons, leading to the production of ATP and NADPH, which are used in the light-independent reactions of photosynthesis to produce glucose.

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