True nucleus is absent in

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(D) true nucleus is a characteristic feature of eukaryotic cells,where the genetic material is enclosed within a nuclear membrane.$Mucor$ is a fungus,

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Anabaena

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(D) true nucleus is a characteristic feature of eukaryotic cells,where the genetic material is enclosed within a nuclear membrane.$Mucor$ is a fungus,$Vaucheria$ is an alga,and $Volvox$ is an alga; all of these are eukaryotic organisms.$Anabaena$ is a genus of filamentous cyanobacteria (blue-green algae),which are prokaryotic organisms.Prokaryotic cells lack a membrane-bound nucleus and other membrane-bound organelles.Therefore,a true nucleus is absent in $Anabaena$.

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