Practice question
Question
A prokaryotic organism possesses chlorophyll a, forms a gelatinous sheath around its colony and may fix atmospheric nitrogen in specialised cells. Which group does it belong to?
Explanation
Cyanobacteria are photosynthetic prokaryotes containing chlorophyll a. Their colonies are generally surrounded by a gelatinous sheath, and some forms, such as Nostoc and Anabaena, fix atmospheric nitrogen in heterocysts.
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