What Will Happen to a Cyanobacterium That Has Its Photosystem

question 20

Multiple Choice

What will happen to a cyanobacterium that has its photosystem II (PSII) blocked?

• A) Additional electron acceptors, such as NADP⁺, will be required to oxidize oxygen and overcome the lost PSII process.
• B) Anoxygenic photosynthesis only using photosystem I (PSI) could occur by using cyclic photophosphorylation and an alternative electron donor such as H₂S.
• C) It will die from being unable to obtain energy for photosynthesis.
• D) Photons will generate excessive reactive oxygen species and the cyanobacterium will die as a consequence.

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