Science Examples

Examples of single-celled organisms

Unicellular organisms

Unicellular organisms are all those living beings that only consist of one cell; within it are all the elements and functions that are needed for its development, evolution and basic functions such as feeding and reproduction.

These or organisms are a type of living entity with a level of complexity much simpler than other types of organisms, they cannot be seen with the naked eye and for this the use of microscopes is necessary for the very fact of being composed of a single cell.


The reproduction of this type of organisms is carried out by bipartition or what is also known as cell division; In some cases there may be cases of budding and sporulation , an example may be bacteria which tend to come together, thus forming colonies.

Examples of single-celled organisms

  1. Amoebas
  2. The seaweed
  3. Bacilli.
  4. Streptococci
  5. Pneumococcus
  6. Paramecia
  7. Staphylococci
  8. Spirulina
  9. Entamoeba hystolytic
  10. Iodamoeba buschlii
  11. Plasmodium vivax
  12. Plasmodium falciparum
  13. Trichomonas vaginalis
  14. Mycoplasma pneumoniae (bacteria)
  15. Blue green algae


Currently they represent one of the forms of life with the greatest quantity on the planet , they are found in different types of environments such as air, land and water and this is because they have a great capacity to adapt to the environment.

Other characteristics of unicellular organisms are, for example, cyclosis , which is a process in which they mobilize among themselves based on the cytoplasm. It is found in three kingdoms which are the protoctist, the fungi and the monera. There are organisms such as unicellular algae which have an important value on the planet because they have a vital function in the photosynthesis process.


Despite the simplicity of their structure, single-celled organisms can be classified into two types:

  • the eukaryotes having a single cell has the actual core
  • the prokaryotes that do not have a fixed core so that the DNA is in the cytoplasm.

In everyday life we ​​can find many of these organisms in elements such as bread, foods made from yeast or ferment, dietary supplements and even within ourselves as in the intestine and skin.

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