BIO ES-141A Lecture Notes - Unicellular Organism, Asexual Reproduction, Multicellular Organism

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The form (morphology) of an organism can be unicellular (one celled) or multicellular (many celled). As stated initially, one major difference between unicellular and multicellular organisms is the cellularity or the number of cells. Read on the explore more differences between the two: Unicellular organisms are composed of a single cell. Multicellular organisms are composed of more than one cell. A single cell carries out all necessary life processes. The total cell body is exposed to the environment. Only the outer cells are exposed to the environment. Division of labour is at the organelle level. Division of labour is at cellular, tissue, organs and organ system level. A lifespan of a unicellular organism is usually short. Injury to the cell leads to the death of the organism. Injury to a cell does not cause the death of the multicellular organism. Asexual reproduction is predominant, however, sexual reproduction is also seen (conjugation)

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