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2015-07-01T12:58:54+05:30

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The reason is that cyanobacteria appeared to look a lot like green algae when they were first discovered. We now know that they really are bacteria (prokaryotes). One criterium to distinguish cyanobacteria from true algae is that prokaryotes lack a whole bunch of organelles present in algae, plants and animals (eukaryotes). For example: they don’t have a Golgi apparatus! >:-(
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it's copied! http://www.plantcellbiology.com/2012/08/why-are-blue-green-algae-called-cyanobacteria/