I GIVE THUMBS UP! HELP! This is what I think it is but I\'m not sure. please pro

Question

I GIVE THUMBS UP! HELP! This is what I think it is but I'm not sure. please provide full explanation. Thanks!

7 Would oxygen be produced in the presence of chemical uncouplers such as DCMU? Yes oxygen would stli be produced in the presence of DCMU DCMU is very specific as it blocks the transport of electrons from photosystem 2 to photosystem 1 Since oxygen is produced during photosystem 2, it would still be produced since the reaction is only effected later during the transfer of electrons from PS2 to PS1

Explanation / Answer

DCMU is a very specific and sensitive inhibitor of photosynthesis. It blocks the plastoquinone binding site of photosystem II, disallowing the electron flow from where it is generated, in photosystem II, to plastoquinone. This would block any further oxidation of water and hence, no oxygen. Also, this interrupts the photosynthetic electron transport chain in photosynthesis and thus reduces the ability of the plant to turn light energy into chemical energy (ATP and reductant potential).

DCMU only blocks electron flow from photosystem II, it has no effect on photosystem I or other reactions in photosynthesis, such as light absorption or carbon fixation in the Calvin cycle. If DCMU only blocks the Photosystem II and not destroy the electron carriers or when a route is supplied(like ferricyanide) that move electrons to Photosystem I,then water will still be broken down producing oxygen.

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