PhotophosphoryWHAT?

For this video project, we decided to explore the process of photophosphorylation Photophosphorylation is the process by which ATP is created during the light-dependent phase of photosynthesis in plants. Photophosphorylation begins when a photon of light corresponding to a red-orange or green-blue frequency hits the chlorophyll in the chloroplast of a plant. That energy from the photon excites an electron in the chlorophyll, causing it to leave the chlorophyll. The chlorophyll, having become oxidized, requires a new electron. The accessory protein in the thylakoid membrane pulls an electron from one of the many water molecules in the stroma, and passes it back to the chlorophyll. The water molecule, having lost an electron, breaks down into two hydrogen ions and one oxygen molecule. The freed oxygen molecules bond together, forming O2, and leave the plant entirely. The electron that was originally released from the chlorophyll gets passed to the cytochrome. This excites the cytochrome, causing it to pump the newly freed hydrogen ions from the stroma, through the thylakoid membrane and into the thylakoid space. The large concentration of hydrogen ion forms a chemiosmotic gradient. The hydrogen ions, compelled by the laws of diffusion, must leave the thylakoid space so they move through the ATP synthase enzyme. The momentum produced from the mass exodus of hydrogen ion spins the ATP synthase. The ATP synthase is attached to an ADP molecule, and one phosphate group. The spinning motion bonds the ADP with the phosphate group forming ATP, the final product of the photophosphorylation reaction.

By Afra K. and Angie T.

Category:

Science & Technology

Tags:

• biology
• photosynthesis

[timbercanebamboo]

yeradork! and thanks :)

[joeyjo100]

why is there a subliminal message at 1:36 of a man at a conference???

[speedy1088]

nice video next time it would be better if things were labeled

[Loewenthal1]

this is good.. it helped me a lot, thankys

[SamuelHammer]

ooops! got the sound back.

and your narration is very good.

1) electron is taken from water molecule in the thylakoid space not the stroma

ps luv rs!

[SamuelHammer]

an amazing animation but do you know there's no sound?

also, since we're deep in the thylakoid here it would help viewers to have some narrative (even labels) so they knew what they were seeing and how it all fits together.