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.
Answer: B
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