17. Prokaryotic cells all lack a nucleus and other internal-1
cell membranes. Both bacteria and cyanobacteria are
.prokaryotic
-Bacteria come in three basic shapes:2.
, Coccus , bacillus
.and spirillum
Almost all eubacteria are heterotrophs and obtain-3
nutrition from outside sources. Many of these
bacteria are saphrophytic and live by causing decay
and putrification of organic material. Some
eubacteria are parasitic and responsible for disease in
.plant, animals, and humans