Practice question
Question
An organism is prokaryotic, photosynthetic and may occur as a unicellular, colonial or filamentous form. Which additional feature would support its identification as a cyanobacterium?
Explanation
Cyanobacteria are photosynthetic prokaryotes containing chlorophyll a. They may be unicellular, colonial or filamentous, and their colonies are generally surrounded by a gelatinous sheath. Some forms also fix atmospheric nitrogen in heterocysts.
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