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Question

A prokaryotic colony contains chlorophyll a, is surrounded by a gelatinous sheath and sometimes forms specialised nitrogen-fixing cells. Which group is being described?

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Explanation

Cyanobacteria are photosynthetic prokaryotes containing chlorophyll a. Their colonies commonly possess a gelatinous sheath, and forms such as Nostoc and Anabaena may contain nitrogen-fixing heterocysts.

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