Bacteria come in three basic shapes - coccus, which can be found in clusters, chains, or pairs; bacillus, which can be found in chains; and spirillum. Prokaryotic cells like bacteria and cyanobacteria lack nuclei and internal membranes. Most eubacteria are heterotrophs that obtain nutrition from outside sources, with many living as saprophytes that cause decay and some being parasites that can cause disease.
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