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(B) Eubacteria,also known as 'true bacteria',are characterized by a rigid cell wall and,if motile,a flagellum.$(2)$ $Anabaena$ is a cyanobacterium,whi

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$(B)$ $2, 3, 7, 8$

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(B) Eubacteria,also known as 'true bacteria',are characterized by a rigid cell wall and,if motile,a flagellum.$(2)$ $Anabaena$ is a cyanobacterium,which is a type of eubacteria.$(3)$ Many cyanobacteria (eubacteria) perform $N_2$ fixation.$(7)$ Cyanobacteria often possess a gelatinous sheath surrounding their colonies.$(8)$ $Heterocyst$ is a specialized cell found in some filamentous cyanobacteria (eubacteria) for nitrogen fixation.Methanogens $(1)$ and Thermoacidophiles $(4)$ are Archaebacteria.Diatoms $(6)$ are Protists (Eukaryotes).Therefore,the correct set associated with Eubacteria is $(2, 3, 7, 8)$.

Which of the following are characteristics or examples associated with Eubacteria (True Bacteria)?
$(1)$ Methanogens $(2)$ Anabaena $(3)$ $N_2$ fixation $(4)$ Thermoacidophiles $(5)$ Eukaryotes $(6)$ Diatoms $(7)$ Gelatinous sheath $(8)$ Heterocyst

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Which of the following are characteristics or examples associated with Eubacteria (True Bacteria)?$(1)$ Methanogens $(2)$ Anabaena $(3)$ $N_2$ fixation $(4)$ Thermoacidophiles $(5)$ Eukaryotes $(6)$ Diatoms $(7)$ Gelatinous sheath $(8)$ Heterocyst