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								Protein shell enclosing the viral genome									 | 
								Capsid									 | 
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								Membrane that cloaks the capsid that in turn encloses a viral genome									 | 
								Viral envelope									 | 
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								Viruses that infect bacteria									 | 
								Bacteriophage/phage									 | 
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								Limited variety of hosts a phage can infect									 | 
								Host range									 | 
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								Phage reproductive cycle that culminates in the death of the host cell									 | 
								Lytic cycle									 | 
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								Phage that reproduces only by the lytic cycle									 | 
								Virulent phage									 | 
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								Endonuclease that recognizes &cuts DNA molecules foreign to a bacterium									 | 
								Restriction enzyme									 | 
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								Allows replication of the phage without destroying the host									 | 
								Lysogenic cycle									 | 
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								Phage capable of using both modes of reproducing within a bacterium									 | 
								Temperate phage									 | 
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								Phage genome that has been inserted in to a specific site on a bacterial chromosome									 | 
								Prophage									 | 
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								RNA virus that reproduces by transcribing its RNA into DNA &then inserting the DNA into a cellular chromosome									 | 
								Retrovirus									 | 
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								Transcribes and RNA template into DNA, providing and RNA --> DNA information flow, the opposite of the usual									 | 
								Reverse Transcriptase									 | 
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								The retrovirus that causes AIDS									 | 
								HIV									 | 
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								Symptoms and signs present during the late stages of HIV infection, defined by a specified reduction in the # of T cells & the appearance of characteristic secondary infections									 | 
								AIDS									 | 
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								Integrated viral DNA that never leaves the host's genome, remaining a permanent resident of the cell									 | 
								Provirus									 |