True or False: Prokaryotes and Viruses. Write true if the statement is true or false if the statement is false. Prokaryotes are single-celled organisms that lack a nucleus. Since prokaryotes do not have organelles, they do not have ribosomes. Cyanobacteria were probably the first organisms to photosynthesize. The first Archaea discovered were the extremophiles. The most common prokaryotic shapes are helices, polygons, spheres, and rods. Both Bacteria and Archaea have plasma membranes and cell walls. Flagella help bacteria move. Because they are simple single cells, prokaryotes do not need energy. There are billions of bacteria inside the human intestines that help digest food. 10. Insects are common vectors for spreading bacterial diseases between humans. 11. Bacteria provide vital ecosystem services as important producers and are needed for the carbon and nitrogen cycles. 12. Bacteria in food water are usually not killed. 13. An individual virus is non-living. Viruses lack cell membranes, cytoplasm, and ribosomes but they do have genetic material. 15. A virus is essentially DNA or RNA and a protective protein coat. 16. Populations of viruses still divide like cells even though they are not cells. 17. Viruses can remain latent within the body for many years. 18. Antibiotics only kill certain kinds of viruses. 19. Viruses are small particles, smaller than eukaryotic cells but larger than prokaryotic cells. 20. Scientists did not know about viruses until they were first seen with an electron microscope in the 1930s. 21. A virus can only replicate inside a host cell.