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Thread: Photosynthesis, Cellular Respiration- Conservation of Energy

  1. #1 Photosynthesis, Cellular Respiration- Conservation of Energy 
    Forum Freshman PPonte's Avatar
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    Photosynthesis is the process by which plants, some bacteria, and some protistans use the energy from sunlight to produce sugar, which cellular respiration converts into ATP, the "fuel" used by all living things.

    The photosynthesis overall reaction can be written as:

    6H2O + 6CO2 → C6H12O6+ 6O2
    Consumes 18 ATP molecules per glucose(Calvin Cycle).


    C6H12O6 + 6O2 → 6CO2 + 6H2O
    Yields 36/38 ATP molecules per glucose.

    As they are inverse reactions, although carried by different processes, the energy consumed in Photosynthesis to produce one glicose (18 ATP), shouldn't be equal to the number of ATP molecules yield by oxidation of one glicose in Cellular Respiration? Or, in the last mentioned process, there is an input of energy that I didn't notice?

    Thank you.


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  3. #2  
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    the sun's enenrgy is stored in the bonds of glocouse.
    the sun splits the water
    first, the sun charges electrons stored in chloroplasts, they move through enzymes wich make some ATP molucles Cylic photophosorylation

    the sun also cahrges two more electrons which join NADP
    NADP + 2 electrons (no charge until sun hits them) = NADP--

    the NADP-- splits the water


    2H2O = 4H+ ions and O2 + 4 electrons

    the H+ ions reduceNADP-- to NADPH [size=x-small]2[/size]
    electrons make more atp, and replace lost eletrons to the NADP--
    oxygen is released


    so the sun is the missing energy, only the plants turn it into chemical energy.

    6H2O + 6CO2 + sun → C6H12O6+ 6O2


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  4. #3  
    Forum Freshman PPonte's Avatar
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    the sun's enenrgy is stored in the bonds of glocouse.
    the sun splits the water
    first, the sun charges electrons stored in chloroplasts, they move through enzymes wich make some ATP molucles Cylic photophosorylation

    the sun also cahrges two more electrons which join NADP
    NADP + 2 electrons (no charge until sun hits them) = NADP--

    the NADP-- splits the water


    2H2O = 4H+ ions and O2 + 4 electrons

    the H+ ions reduceNADP-- to NADPH [size=x-small]2[/size]
    electrons make more atp, and replace lost eletrons to the NADP--
    oxygen is released
    Sorry, goodgod3rd, but you are just describing Photosynthesis. I know that the chemical energy from the glucose bonds comes from the radiation emited by the sun, but that is not the point. Thank you, anyway, for your help. :-D
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  5. #4  
    Forum Professor Zwolver's Avatar
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    fotosynthesis can also be caused of heat, beta radiation, and kinetic impacts of other molecules. It's the chlorofyl that causes the reaction trought a katalysator, and it only captures red light (reflects green light) from 450 to 550 nm.

    It's a increddible hard to comprehend proces, we don't know how they do it yet, or how to recreate it. we just knew how the citric acid cycle works...

    a load to learn...
    Growing up, i marveled at star-trek's science, and ignored the perfect society. Now, i try to ignore their science, and marvel at the society.

    Imagine, being able to create matter out of thin air, and not coming up with using drones for boarding hostile ships. Or using drones to defend your own ship. Heck, using drones to block energy attacks, counterattack or for surveillance. Unless, of course, they are nano-machines in your blood, which is a billion times more complex..
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  6. #5  
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    i totally misread the question. on the plusside, it made me revise that topic. on the down side , i look like a silly boy.


    i know a bit about respiration too. not enough to go into any detail (not makign that mistake again).

    i understand the extra energy is the electrons going through systems of enzymes in the electron transport system. the electrons lose energy, step by step like a stairway, and form ATP adn at the end water.

    how this extra energy is obtained is the formation of CO2

    it all has to do with the chemicals, the fact that Carbon + Oxygen forms CO2.

    sorry again
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