Synechococcus, a Cyanobacterium, Is a Free-Living Marine Organism That Fixes

question 25

Multiple Choice

Synechococcus, a cyanobacterium, is a free-living marine organism that fixes CO₂ into biomass while producing molecular oxygen utilized by swarms of heterotrophic bacteria. Which of the following is the most likely habitat of this bacterium?

• A) euphotic zone of the pelagic environment
• B) the benthos
• C) the littoral zone
• D) lake sediments
• E) aphotic zone

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