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The well-defined nucleus is absent in: A. Blue-green algae B. Diatoms C. Algae D. Yeast

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The well-defined nucleus is absent in: 

A. Blue-green algae 

B. Diatoms 

C. Algae 

D. Yeast

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Blue-green algae (BGA) also known as cyanobacteria, is a member of kingdom Monera. Monerans are prokaryotic and lack a well-defined nucleus. They also lack double membrane-bound organelles. Ribosomes present in bacteria as of 70s type.

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