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Cyanobacteria (blue-green algae) are CHEMICALLY distinct from other bacteria because they:
ALack a cell wall
BAre anaerobic only
CAre non-cellular
DHave chlorophyll a similar to green plants and are photosynthetic autotrophs
Answer & Solution
Correct answer: D. Have chlorophyll a similar to green plants and are photosynthetic autotrophs
Cyanobacteria contain chlorophyll a (the same pigment as green plants) and are photosynthetic autotrophs. They are unicellular, colonial or filamentous. Some (e.g. Nostoc, Anabaena) fix atmospheric nitrogen in specialised cells called heterocysts.
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