Unicellular vs Multicellular | Biology for All | FuseSchool
Did you know that some organisms exist of just one cell? These simple organisms, like amoeba, are unicellular. They depend on simple diffusion for life They ...
What are simple or unicell and multicell?
1. Unicellular organisms have one cell, while multicellular organisms are composed of many different types of cells.
2. Unicellular organisms are mostly prokaryotes, while multicellular organisms are generally classified as eukaryotes.
3. Unicellular organisms are usually smaller (often always microscopic in nature) and less complex compared to their more visible and complex multicellular counterparts.
Generally, unicellular organisms fall under the umbrella of the prokaryotes, or prokaryotic entities. They are termed as prokaryotes because they are not that specialized, unlike the more complex eukaryotes. Unicellular organisms and the prokaryotes do not have the structure called the cell nuclei. Moreover, their bodies are very limited in size, because they cannot handle certain surface area to volume ratio issues. The result of this, is that unicellular organisms are mostly microscopic in nature. They are so minute, that they are not visible to the naked eye.
Besides from not having a cell nucleus, prokaryotes are those that don’t have internal organ bodies, covered in organic coats which are termed as membranes. They are also those that often dwell in habitats which are too hazardous to support life, like the very acidic environments, and radiation-filled areas. Examples of unicellular organisms are bacteria and archea.
On the other hand, multicellular organisms are those that house a multiple number, or many, cell types. These organisms are usually larger in size, have more specialized functions, and are classified as the eukaryotes. These organisms are termed as eukaryotes because they have cell nuclei, and have their DNAs differently placed from the remainder of the cell. Due to these facts, they can actually grow to bigger sizes; they can conduct more complex activities or functions, and their cells permanently act harmoniously with each other.