The organisms which completely lack a cell wall and can live without oxygen are

$P$ - Assertion: Some bacteria are Gram-negative.
$Q$ - Reason: Gram-negative bacteria do not retain the Gram stain.

The nucleotide sequence in ribosomal $RNA$ provides the best evidence for the phylogeny of Monera. Based on this information,which are the most primitive Monerans?

The glycocalyx of fibers on some bacteria is made up of:

Plasmids occur in

An example of iron bacteria is