Unicellular and multicellular organisms

Question and Answer About Unicellular and Multicellular


What are unicellular and multicellular organisms?



Unicellular organisms are those formed by a single cell that performs all necessary cellular functions.

Examples: bacteria, protozoa and some species of algae.


They are the organisms formed by more than one cell. They are far more complex than single-celled, all of which are eukaryotes. These organisms may be autotrophs (producing their own food) or heterotrophs (feeding on other beings because they are unable to produce their own food). Reproduction can be either sexual (exchange of genetic material) or asexual (without conjugation of genetic material).

Examples: animals (mammals, reptiles, fish, insects, arachnids, amphibians etc.), plants (trees, plants, grasses, shrubs etc.) and some species of algae and fungi.



Elaine Barbosa de Souza
Undergraduate student in Biological Sciences at Methodist University of São Paulo.

- The question was submitted to the Toda Biologia website by: Marcos S. Souza on 01/25/2019.