Indicate True or False. If false, explain your answer in the second box.

1. Heterocysts are found in all true cyanobacteria.
2. Many true cyanobacteria are capable of gliding motility. 
3. True cyanobacteria have true flagellae. 
4. To culture true cyanobacteria, you will need to give them vitamins. 
5. Many true cyanobacteria can poison water by secreting neurotoxins. 
6. True cyanobacteria are algae. 
7. Some true cyanobacteria are symbionts of other organisms, e.g., plants and fungi. 
8. True cyanobacteria are though to have been the origin of earth's oxygen atmosphere.