Publication Details
Abstract
Microorganisms are integral to ecological systems and biochemical cycles, occupying nearly all environments on Earth. Among them, prokaryotic organisms—bacteria and archaea—exhibit structural simplicity yet vast diversity, influencing fields from agriculture to biotechnology. Their morphological features, including shape, size, and motility, inform their classification and ecological roles. Despite advancements in microbial genetics and classification, challenges remain in fully elucidating evolutionary relationships and unifying microbial taxonomy. This article aims to provide a comprehensive overview of the external morphology of microorganisms, the structural components of prokaryotic cells, and the systematic differences between bacteria and archaea. Key findings include the structural roles of the cell wall, flagella, capsules, and genetic material in prokaryotes, alongside their physiological adaptability. The classification of prokaryotes into systematic categories based on molecular and phenotypic traits is discussed, particularly the significance of 16S rRNA analysis. The article highlights the role of advanced genetic tools, such as nucleotide composition analysis and DNA hybridization, in distinguishing microbial species. It also emphasizes the unique molecular characteristics of archaea, which exhibit traits common to both prokaryotes and eukaryotes. Understanding the morphology and classification of prokaryotes is crucial in medical microbiology, biotechnology, and ecological studies. This foundational knowledge supports the effective use of beneficial microorganisms while mitigating the risks posed by pathogenic species.