Unicellular are the organisms which are made of single cell. The single perform all the necessary vital functions of life. Mostly unicellular organisms are prokaryotes such as bacteria, but some are eukaryotes like fungi, and protozoans.
As the name implies, an unicellular organism is that living being whose body consists of a single cell. Examples of this kind of organisms are bacteria's, protozoan and some types of algae.
An organism composed of one cell.
amoeba
made of a single cell
No, mushrooms are multicellular organisms.
They are unicellular organisms.There are eukariyotic and prokariyotic unicellulars.
A unicellular organism consist of one single cell. A unicellular organism is usually a type of bacterial object such as prokaryotes. Unicellulars reproduce asexually while multicellulars reproduce sexually.
Unicellulars don't have any vascular system they take food by diffusion. Small animals such as some invertebrates have open circulatory system, larger animals like vertebrate have a closed circulatory system.
I think you might want to look at your question again. A unicellular organism doesn't have a job in a cell because they are a cell. Unicellular organisms consist of only one cell (such as an amoeba) and the cell has to carry out all necessary life functions. Multicellular organisms are composed of more than one cell, or more than one type of cell. In this case, cells can become specialized and carry out different functions. There are many individual parts of a cell, such as a nucleus, cell membrane, ribosomes, endoplasmic reticulum, Golgi apparatus, etc. These are found in unicellular organisms and cells of multicellular organisms.