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Bacteria are unicellular organisms that lack a nuclear membrane and true nucleus. They are classified as prokaryotes (Gr: before kernel [nucleus]), having no mitochondria, endoplasmic reticulum (ER), or Golgi bodies. The absence of the preceding bacterial cell structures differentiates them from eukaryotes.
Eukaryotic parasites exist as unicellular organisms of microscopic size, whereas others are multicellular organisms. Protozoa are unicellular organisms within the kingdom Protista, which obtain their nutrition through ingestion. Some are capable of locomotion (motile), whereas others are nonmotile.
Viruses are the smallest infectious particles (virions); they cannot be seen under an ordinary light microscope. They are neither prokaryotic nor eukaryotic. Many times we can see their effects on cell lines, such as inclusions, rounding up of cells, and syncytium (cell fusion of host cells into multinucleated infected forms), where these characteristics become diagnostic for many viral diseases.
Bacteriophage (Gr phage: to eat)
A virus that infects and possibly destroys bacterial cells
is the orderly classification and grouping of organisms into taxa (categories). Taxonomy involves three structured, interrelated categories: classification/taxonomy, nomenclature, and identification.
Categories in taxa?
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