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Unicellular organisms are composed of a single cell. Multicellular organisms are composed of many specialized cells. Specialized cells differ in structure (size, shape...) and function (the role they perform in the organism).
By Heather Scoville. Multicellular eukaryotic organisms can have many different types of cells that can perform different functions as they combine to form tissues. There are two main types of cells within the multicellular organism. These are called somatic cells and sex cells, or gametes. Somatic cells. Somatic cells are a regular type of body cell that is not involved in anyway in sexual reproduction. In humans, somatic cells are diploid, meaning they have two full sets of chromosomes in them.