All Prokaryotes are unicellular and some species and aggregate or form true colonies and some even are able to show division of labor between bio-films and specialist cell types. It is also common in Cocci, Bacilli and Spirochate Helices.
Bacteria is classified on its ability to stain for the last 150 years or so and this is where we can differentiate between the two different major groups of bacteria which have different cell wall envelopes.
Gram Positive (+) = Bacteria retain the stain which is crystal violet turns a purple color.
Gram Negative (-) = Where bacteria appear pink is due to the counter stain.
**!!REMEMBER TO STAY POSITIVE LIKE A PROTON!!**
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