Name the trait that distinguishes cyanobacteria from other bacteria.

Cyanobacteria are also known as blue-green algae. They differ from other bacteria in that they have chlorophyll-a, whereas most bacteria do not contain chlorophyll. Chlorophyll-a gives them their characteristic blue-green color. Cyanobacteria are comparatively larger in size than bacteria. They can only live in the presence of sunlight and moisture, whereas bacteria are able to live in all possible places. The cell wall of cyanobacteria has 4 layers, while the bacterium has 1-2 layers. The cell wall is made up of cellulose and pectin, and in bacteria – glycolipids and peptidoglycan.