How does a one-celled organism differ from the single cell of a multi-cellular organism?

Question

A few ways that they are different would be great. Thanks!

Answer 1

Firstly, the one-celled organism has to perform ALL the functions of an organism. These involve obtaining of nutrients, water, osmoregulation, movement, reproduction, protection etc. This is why one cell organisms usually (not always) have cell walls for protection, and some one-celled organisms also have contractile vacuoles which remove excess water to maintain water balance. The single cell of a multi-cellular organism is specialised to perform usually only one of the above functions. Eg, muscle cells are for movement.

Secondly, the one-celled organism can survive on its own while a single cell of the multi-cellular organism usually cannot survive when isolated (not counting cells cultured in labs). This is because the cell is usually anchored to an extracellular matrix present in its surroundings.

Answer 2

Multi Celled Organisms

Answer 3

a one-celled organism is an organism by itself. the single cell is one out of many cells that make up an organism.

Answer 4

A unicellular organism has to do all the life processes for itself.
1. It may move around with cilia, flagella, or pseudopodia.
2. It must either make food or get food for itself.
3. It must digest the food by itself - no digestive system to break down the food before the food is delivered to the cell.

Answer 5

multi celled organisms typically have differentiated cells. Cells that do different things (like group and become organs).

Answer 6

they have less organelles, they usually dont have nucleauses (single celled)

Answer 7

It doesn't.