HSC Together > Year11 > Introduction to The Organisation of Cells


Introduction to The Organisation of Cells

Unicellular, Multicellular and Colonial Organisms

This post will be an introduction to the organisation of cells topic and will explore unicellular, multicellular and colonial organisms for Prelim Biology.

Topic: Organisation of Cells

  • Compare the differences between unicellular, colonial and multicellular organisms by:
    • Investigating structures at the level of the cell and organelle


Unicellular vs Multicellular Organisms

Unicellular organisms are organisms that are made from one cell while multicellular organisms are made up of more than one cell. This video will explore unicellular and multicellular organisms in more detail.


Organelles recall from an earlier post, are cellular structures that exist within cells and have specific functions. This video will explore organelles in a little more detail.


What are Colonial Organisms?

Colonial organisms are kind of an in-between of unicellular and multicellular organisms, for example, many unicellular organisms can come together to make a colony with each organism having a specific duty or job that benefits the whole colony. Thus, a colonial organism can behave as a multicellular organism (having multiple parts with specific features) but is made from unicellular organisms such as bacteria. While it is advantageous to live in a colony, if a cell were to break off, it would still be able to survive unlike in a multicellular organism.

This video explores colonial organisms and the benefits of being a colonial organism.