Multicellular and unicellular cells are similar and also different because: .Multicellular organisms are made up of many cells. Unicellular organisms are made of one cell. Multicellular organisms are Eukaryote in nature. Unicellular organisms are prokaryotic in nature. .Multicellular are larger then unicellular cells. .Multicellular cells contains specific organ (specific function). .Unicellular cells have all functions controlled by single. cell .Multicellular cells are a complex organism. .Unicellular cells is an simple body construction (Single cell).