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Photosynthesis (Light)

شروع موضوع توسط !!!OMID!!! در ‏13 دسامبر 2014 در انجمن گرایش های زیست شناسی

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    !!!OMID!!! کاربر پر تلاش ( طلایی)

    تاریخ عضویت:
    ‏5 دسامبر 2014
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    avcell.ndsu.nodak.edu_animations_photosynthesis_images_PhotoStills_01_FL.jpg The light reactions of photosynthesis involve several protein complexes. The complexes are embedded within the chloroplast's thylakoid membrane.
    avcell.ndsu.nodak.edu_animations_photosynthesis_images_PhotoStills_02_FL.jpg The first complex uses the energy from photons of light to excite electrons.
    avcell.ndsu.nodak.edu_animations_photosynthesis_images_PhotoStills_03_FL.jpg After two electrons have been excited, they are tranferred to a mobile carrier protein (magenta). The carrier also picks up two hydrogen ions, also known as protons.
    avcell.ndsu.nodak.edu_animations_photosynthesis_images_PhotoStills_04_FL.jpg The tranferred electrons are replaced by the splitting of water molecules. After two water molecules have been split, one molecule of O2 is made.
    avcell.ndsu.nodak.edu_animations_photosynthesis_images_PhotoStills_05_FL.jpg The mobile carrier transports the electrons to the second complex (yellow) and releases the two protons across the membrane.
    avcell.ndsu.nodak.edu_animations_photosynthesis_images_PhotoStills_06_FL.jpg As the two electrons are transferred through the second complex, it pumps two more hydrogen ions across the membrane.
    avcell.ndsu.nodak.edu_animations_photosynthesis_images_PhotoStills_07_FL.jpg The electrons are then tranferred to a second mobile carrier (dark blue).
    avcell.ndsu.nodak.edu_animations_photosynthesis_images_PhotoStills_08_FL.jpg The second carrier transfers the electrons to the third major complex.
    avcell.ndsu.nodak.edu_animations_photosynthesis_images_PhotoStills_09_FL.jpg The third complex uses photons to re-energize the electrons, after which they are transferred by another mobile carrier (purple) to the fourth complex (pink).
    avcell.ndsu.nodak.edu_animations_photosynthesis_images_PhotoStills_10_FL.jpg The fourth complex combines the two electrons, one proton, and a molecule of NADP+ to create a molecule of NADPH.
    avcell.ndsu.nodak.edu_animations_photosynthesis_images_PhotoStills_11_FL.jpg ATP synthesis occurs at a fifth complex. It is powered by the hydrogen ion gradient created by the protons that were pumped across the membrane.
     
    Last edited by a moderator: ‏14 دسامبر 2014
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