Explain the difference between one celled organisms and many celled organisms?

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gsenviro eNotes educator| Certified Educator

The differences between one-celled (or unicellular) and many-celled (or multicellular) organisms:

                                                   Unicellular                                               Multicellular

1) Nomenclature:                  Also called Prokaryotes                            also called Eukaryotes

2) Origin history                   first life forms on planet                            evolved much later

3) Example                             Bacteria, Archaea                                animals, plants, humans

4) Complexity                      very little, simple life form                    more complex life forms

5) Nucleus                             Absent                                                     Present

6) Membrane bound nucleus            Absent                                                  Present

7) Mitochondria                                 Absent                                            Present

8) Nuclear Membrane               Absent                                                    Present

These are some of the major difference between these two cell-classes. There are more differences,esp.  due to presence of more complex molecules,tissues and organs in Eukaryotes, which make them more efficient as compared to prokaryotes.

For more differences and cell images kindly search for Prokaryotes and Eularyotes on your favorite search engine.

Good luck.

estudy | Student

In addition to the above two answers, multicellular organisms show division of labour i.e. they have specialised tissues and cells for specific functions and processes. While in unicellular organisms like amoeba just one cell carries out all the basic processes of life like growth, metabolism, reproduction etc.

iamkaori | Student

Unicellular organisms can survive without the help of other cells since their only cell is so complex. Multicellular organisms are much more complex since there are many cells that make up their body, and these cells are dependent on each other. Their cells are more specialised and thus different, while unicellular organisms have all functions in one cell. Multicellular organisms also depend on the health of all its cells to survive.