| A | B |
|---|
| stromatolite | dome-shaped rock composed of thin layers of sediment pressed tightly together |
| archaea | domain of prokaryotic organisms that are biochemically and genetically distinct from bacteria |
| bacteria | domain of prokaryotic organisms that are biochemically and genetically distinct from archaea |
| coccus | a spherical bacterium |
| bacillus | a rod-shaped bacterium |
| binary fission | mode of prokaryote asexual reproduction in which each daughter cell receives an identical copy of the parent cell's chromosome |
| endospore | dormant cell formed by certain bacteria that can survive very harsh conditions |
| cyanobacteria | group of prokaryotes that generate oxygen as a waste product of their photosynthesis |
| pathogen | a disease-casuing organism |
| cell wall | physical barrier that protects against mechanical damage |
| capsule | protects from other cells and helps groups of bacteria to stick together |
| cell membrane | acts as a partially permeable layer which controls the entry and exit of chemicals |
| flagellum | aids movement of bacterium |
| circular DNA | possesses the genetic information for the replication of bacterial cell |
| plasmid | possesses genes that aid the survival of bacteria in adverse conditions |
| pilus | joins bacterial cells for DNA exchange |
