Viruses
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| 1200529424 | virus | particle made up of nucleic acid, protein, and in some cases lipids that can replicate only by infecting living cells. | 0 | |
| 1200529425 | capsid | the outer covering of protein surrounding the nucleic acid of a virus | 1 | |
| 1200529426 | viral envelopes | a membrane that cloaks the capsid that in turn encloses a viral genome | 2 | |
| 1200529427 | bacteriophages | viruses that infect bacteria | 3 | |
| 1200529428 | host range | The limited range of host cells that each type of virus can infect and parasitize. | 4 | |
| 1200529429 | lytic cycle | a viral reproductive cycle in which copies of a virus are made within a host cell, which then bursts open, releasing new viruses | 5 | |
| 1200529430 | virulent phage | A phage that reproduces only by a lytic cycle. | 6 | |
| 1200529431 | prophage | the viral DNA that is embedded in the host cell's DNA | 7 | |
| 1200529432 | lysogenic cycle | a viral reproductive cycle in which the viral DNA is added to the host cell's DNA and is copied along with the host cell's DNA | 8 | |
| 1200529433 | temperate phages | Phages that are capable of using either the lytic or lysogenic cycle. | 9 | |
| 1200529434 | retroviruses | An RNA virus that reproduces by transcribing its RNA into DNA and then inserting the DNA into a cellular chromosome; an important class of cancer-causing viruses. | 10 | |
| 1200529435 | reverse transcriptase | a polymerase that catalyzes the formation of DNA using RNA as a template | 11 | |
| 1200529436 | HIV | retrovirus that causes aids | 12 | |
| 1200529437 | AIDS | a syndrome caused by the human immunodeficiency virus (HIV) that renders immune cells ineffective, permitting opportunistic infections, malignancies, and neurologic diseases to develop; transmitted sexually or through contaminated blood | 13 | |
| 1200529438 | provirus | Viral DNA that inserts into a host genome. | 14 | |
| 1200529439 | epidemic | a widespread outbreak of an infectious disease | 15 | |
| 1200529440 | vaccine | immunogen consisting of a suspension of weakened or dead pathogenic cells injected in order to stimulate the production of antibodies | 16 | |
| 1200529441 | pandemic | an epidemic that is geographically widespread | 17 | |
| 1200529442 | viroids | circular RNA molecules, only a few hundred nucleotides long, that infect plants. Viroids do not encode proteins but can replicate in host plant cells, apparently using host cell enzymes | 18 | |
| 1200529443 | prions | misfolded proteins that may induce the normal protein to assume the abnormal shape upon contact | 19 | |
| 1200529444 | restriction enzyme | any of the enzymes that cut nucleic acid at specific restriction sites and produce restriction fragments | 20 |
