| A | B |
| bacteria | A prokaryotic microorganism |
| Virus | A non-cellular parasitic infectious agent |
| bacteriophage | A bacteria-specific virus |
| pathogenic | CCauses disease |
| capsule | A slimy layer around the cells of certain bacteria |
| fimbriae | Sticky hair-like structures present on the surface of some bacteria |
| pilus | A surface appendage in certain bacteria that functions in adherence and the transfer of DNA during conjugation. |
| membranous envelope/coat | This surrounds the viral capsid |
| capsid | The protein coat that encloses the genetic material |
| glycoprotein | Sugar-protein molecule found on the outside of viral envelopes |
| capsomere | Protein subunits of the capsid |
| reverse transcriptase | The enzyme that converts the RNA sequence into DNA |
| vaccination | The administration of material (the vaccine) to produce immunity to a disease |
| virulent | A virus that uses the lytic cycle for replication |
| temperate | A virus that uses the lysogenic cycle for repliaction |
| lytic cycle | Viral replication which results in immediate destruction of the host cell |
| lysogenic cycle | Viral replication which results in the incorporation of viral DNA into the host's DNA |
| virology | The study of viruses |
| antibiotics | A substance or compound that kills, or inhibits the growth of bacteria |
| vector | An organism that carries a pathogenic organism |