Domain: Bacteria

Characteristics: Prokaryotic, but only distantly related to the other domain of prokaryotes, the Archaea

Link to Bacteria image collection


are photosynthetic organisms with both photosystems I and II, hence, evolves oxygen. Most cyanobactera have chlorophyll a only, but exciting new studies show that there are ecologically important members with both chorophylls a and b.

Recognize these genera



(recognize heterocysts and know their function).

What photosystems are found in heterocysts and how does this relate to nitrogen fixation?


Recognize a stromatolite as a fossil of the Cyanobacteria