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(D) : $Archaebacteria$ represent a cell type that possesses characteristics of both prokaryotes and eukaryotes.In size,$Archaebacteria$ are about $1 \

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$Archaea$ have some novel features that are absent in other prokaryotes and eukaryotes.

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(D) : $Archaebacteria$ represent a cell type that possesses characteristics of both prokaryotes and eukaryotes.In size,$Archaebacteria$ are about $1 \mu m$ in diameter,similar to typical prokaryotes.They lack membrane-bound organelles,their nuclear bodies are not bound by nuclear membranes (like prokaryotes),and they possess $70S$ ribosomes.However,they have a unique cell wall that lacks peptidoglycan.They resemble eukaryotic cells in mechanisms of protein synthesis,structural proteins,and $RNA$ components of ribosomes.$A$ distinctive feature of $Archaebacterial$ genes is the presence of introns,which are absent in other prokaryotes but common in eukaryotes.Furthermore,$Archaebacteria$ possess unique characteristics found in neither eukaryotes nor prokaryotes,such as membrane lipids with branched chains and ether linkages,which enable them to tolerate extreme heat and $pH$.

In the light of the recent classification of living organisms into three domains of life ($Bacteria$,$Archaea$,and $Eukarya$),which one of the following statements is true about $Archaea$?

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