Prokaryotes are organisms whose cells lack a nucleus and other organelles. It is divided into two groups: bacteria and archaea.
Archaea are single-celled microorganisms that lack a cell nucleus and membrane-bound organelles. Archaea have a semi-rigid cell wall. Some lack a cell wall altogether. The cell wall lack peptidoglycan. Genome rearrangement events result in unique fragmentation patterns of noncoding RNA genes that require elaborate maturation pathways to yield functional transcripts.
