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DCMU is marketed as an algicide and an herbicide. It works by blocking the binding site...

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Biology

DCMU is marketed as an algicide and an herbicide. It works byblocking the binding site for plastoquinone on photosystem II.

  1. If DCMU blocks plastoquinone from binding to photosystem IIthen in what state (oxidized or reduced) will the chlorophyll a ofphotosystem II be stuck? Why?
  2. Based on your answer above, in what state would plastoquinonebe stuck? Why?
  3. Considering where DCMU binds, would plants in nature exposed toDCMU be able to produce

ATP and NADPH through the lightreactions? Why or why not?

  1. If plants exposed to DCMU cannot produce ATP and NADPH throughthe light reactions, how

would this affect thelight-independent reactions?

  1. DCMU, as an herbicide, will eventually kill plants that areexposed to it. Why is this the case? In

answering this, relate DCMU tophotosynthesis and both DCMU and photosynthesis to cellularrespiration.

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