Viruses
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| 6818707812 | Virus | An infectious particle incapable of replicating outside of a cell, consisting of an RNA or DNA genome surrounded by a protein coat (capsid) and, for some viruses, a membranous envelope. |  | 0 |
| 6818707813 | Capsid | The protein shell that encloses a viral genome. It may be rod-shaped (helical), polyhedral(icosahedral), or more complex in shape. | 1 | |
| 6818707816 | Bacteriophage (Phage) | -viruses that infect bacteria -capsids w/ elongated icosahedral heads w/ DNA -protein tail piece w/ fibers by which phages attach to bacterium attached to head |  | 2 |
| 6818707817 | Host Range | limited number of species whose cells can be infected by a particular virus | 3 | |
| 6818707819 | Lytic cycle | A type of phage replicative cycle resulting in the release of new phages by lysis (and death) of the host cell. | 4 | |
| 6818707821 | Virulent Phage | a phage that replicates only by a lytic cycle | 5 | |
| 6818707822 | Restriction Enzymes | An endonuclease (type of enzyme) that recognizes and cuts DNA molecules foreign to a bacterium (such as phage genomes). The enzyme cuts at specific nucleotide sequences (restriction sites). | 6 | |
| 6818707823 | Lysogenic cycle | Allows replication of the phage genome without destroying the host | 7 | |
| 6818707825 | Temperate Phage | phage capable of using both modes of reproduction in bacteria through replication via the lytic or lysogenic cycle. | 8 | |
| 6818707826 | Prophage | phage genome that has been inserted into a specific site on a bacterial chromosome. |  | 9 |
| 6818707828 | Retrovirus | An RNA virus that replicates by transcribing its RNA into DNA and then inserting the DNA into a cellular chromosome; an important class of cancer-causing viruses. | 10 | |
| 6818707829 | Reverse Transcriptase | An enzyme encoded by certain viruses (retroviruses) that uses RNA as a template for DNA synthesis. | 11 | |
| 6818707830 | HIV | The infectious agent that causes AIDS. HIV is a retrovirus. | 12 | |
| 6818707831 | AIDS | The symptoms and signs present during the late stages of HIV infection, defined by a specified reduction in the number of T cells and the appearance of characteristic secondary infections. | 13 | |
| 6818707833 | Provirus | A viral genome that is permanently inserted into a host genome | 14 | |
| 6818727613 | Viral envelope | A membrane that cloaks the capsid that in turn encloses a viral genome. | 15 |
