PHOTOSYNTHESIS AND ELECTRON TRANSPORT CHAIN

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bluestar2210
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PHOTOSYNTHESIS AND ELECTRON TRANSPORT CHAIN

Post by bluestar2210 » Sat Apr 16, 2005 1:11 pm

Who can tell me about photosynthesis and about electron transport chain? Why don't the leaf burn when electron jump to higher energy?

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thank.darwin
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Re: PHOTOSYNTHESIS AND ECLETRON TRANSPORT CHAIN

Post by thank.darwin » Sun Apr 17, 2005 11:41 pm

bluestar2210 wrote:Who can tell me about photosynthesis and about electron transport chain? Why don't the leaf burn when electron jump to higher energy?



The electrons never jump to higher energy - That would go against second law of thermodynamics...

What do you need to know about photosynthesis?

I can give you some web sites that would help you learn about photosynthesis...
No amount of experimentation can ever prove me right; a single experiment can prove me wrong.
-Albert Einstein

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EmmVeePee
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Post by EmmVeePee » Mon Apr 18, 2005 3:59 am

Doesn't the photon give them the energy to jump shells?
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biostudent84
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Post by biostudent84 » Mon Apr 18, 2005 11:06 am

Electrons commonly jump to higher energy. However, the soon fall back down. Such process is called a "quantum jump." It is the basic principle of how neon lights work. When the electron falls back down, visible light is released. Depending on the atom in which the quantum jump occurs, different wavelengths of light is released.

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mith
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Post by mith » Mon Apr 18, 2005 8:32 pm

It's actually a quantum leap according to my chem teacher, she also said it was an old tv series.
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Post by EmmVeePee » Mon Apr 18, 2005 8:48 pm

mithrilhack wrote:It's actually a quantum leap according to my chem teacher, she also said it was an old tv series.


The answers to all of biology's mysteries lie in this series.
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biostudent84
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Post by biostudent84 » Tue Apr 19, 2005 1:46 am

mithrilhack wrote:It's actually a quantum leap according to my chem teacher, she also said it was an old tv series.


Either term works. Quantum leap is also used for the phemonenon of brief periods of rapid technology evolution. I prefer quantum jump because it reduces confusion.

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cytochromeP
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Post by cytochromeP » Tue Apr 19, 2005 7:00 am

biostudent84 wrote: When the electron falls back down, visible light is released. Depending on the atom in which the quantum jump occurs, different wavelengths of light is released.

Kyle


However, in plants production of such light would be useless - a waste of energy. So what happens instead is that the 'photoreactive' pigment (carotenoid) transfers the execess energy it has acquired to its neighbouring pigment (carotenoid) ... and so on until it reaches the chlorophyl. This 'activated' chlorophyl molecule then breaks up water to liberate O2. This is called "exciton transfer".
The 'down-hill' movement of the electrons is used to generate chemical energy (carbohydrates).
Know thyself.

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Post by MrMistery » Tue Apr 26, 2005 7:59 pm

This is the kind of thing you will find in a textbook. It is true that some xantofils can transfer energy to chlorophil but the main role of carotenoid pigments is protection. If anyone needs details just tell me. This is my hobby
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

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thank.darwin
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Post by thank.darwin » Tue Apr 26, 2005 11:22 pm

biostudent84 wrote:Electrons commonly jump to higher energy. However, the soon fall back down. Such process is called a "quantum jump." It is the basic principle of how neon lights work. When the electron falls back down, visible light is released. Depending on the atom in which the quantum jump occurs, different wavelengths of light is released.

Kyle


Thank-you Kyle... Do electrons ever jump to higher energy in living organisms?
No amount of experimentation can ever prove me right; a single experiment can prove me wrong.
-Albert Einstein

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