A prokaryotic organism contains chlorophyll a, may form colonies surrounded by a gelatinous sheath and sometimes possess
Cyanobacteria are photosynthetic prokaryotes placed in Kingdom Monera. They contain chlorophyll a, their colonies commonly possess a gelatinous sheath, and some forms fix atmospheric nitrogen in specialised cells called heterocysts.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Kingdom Monera - Archaebacteria and Eubacteria