Questions? Comments? Please contact Dr. Phillip McClean or Christina Johnson.

OVERVIEW
Flythrough Tour
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MOLECULAR PROCESSES
Transcription
Regulated Transcription
mRNA Processing
mRNA Splicing
Translation
Lac Operon
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CELLULAR PROCESSES
Protein Trafficking
Protein Modification
Protein Recycling
Insulin Signaling
Constitutive Secretion
Regulated Secretion
Mitochondrial Protein Transport
Mitosis
Meiosis
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CELLULAR ENERGY CONVERSION
Atp Synthase (Gradients)
Electron Transport Chain
Photosynthesis (Light Reaction)
Photosystem II
Glycolysis (Overview)
Glycolysis (Reactions)
Citric Acid Cycle (Overview)
Citric Acid Cycle (Reactions)
Energy Consumption
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HOME > PHOTOSYNTHESIS (LIGHT) > ADVANCED > 1.) PHOTO-II > 2.) CYTO B6-F > 3.) PHOTOSYSTEM I
Photosynthesis (Light): Advanced Look --> 3.) Photosystem I

Photosystem two is the second of the two antenna complexes to engage the electrons being transferred in the photosynthetic ETC. After being passed through this complex, the electrons are transferred to FNR where they form NADPH. Clicking on each of the thumbnail images will bring up a larger, labeled version of the described scene.

To see the Flash movie for the following sequence of images, click here.

Plastocyanin then transports the two electrons to Photosystem I. Like photosystem II, the photosystem I complex contains an antenna for capturing light energy called the LHC.

Inside the photosystem I reaction center, each electron is re-engerized by the resonance energy from a photon of light. It is then transferred to ferredoxin, another mobile carrier (purple, bottom right).

Ferredoxin transfers each electron, one at a time, to Ferredoxin NADP Reductase, otherwise known as FNR (pink).

Once two electrons have been transferred to FNR, they are joined by a hydrogen ion and a molecule of NADP+. FNR then reduces NADP+ by adding to it the two electrons and one proton--creating NADPH.

NEXT --> 4.) ATP SYNTHASE

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