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Viruses & Bacteria
Campbell Biology Chapter 18: Microbial Models: Genetics of Viruses and Bacteria
33
Biology
11th Grade
02/20/2011

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Term
capsid
Definition
protein shell that encloses a virus
Term
viral envelope
Definition
plasma membranes surrounding a capsid on a virus
Term
bacteriophage (phage)
Definition
virus that only infects bacteria
Term
host range
Definition
cells that a virus is capable of parasitizing, can be very broad or very specific
Term
lytic cycle
Definition
viral reproductive cycle that culminates in death of the host cell
Term
virulent virus
Definition
virus that reproduces only by a lytic cycle
Term
lysogenic cycle
Definition
replication of the viral genome without destroying the host
Term
temperate virus
Definition
virus capable of using both the lytic and lysogenic modes of reproduction (ex: lambda)
Term
prophage (provirus)
Definition
viral DNA that has been incorporated by genetic recombination into a specific site on the host cell's chromosome - name specific to bacteriophages
Term
provirus
Definition
incorporation of viral DNA into the host's DNA- able to remain latent in this stage for a long time
Term
retrovirus
Definition
virus that uses RNA as a template to make DNA, which is later transcribed into mRNA for the synthesis of viral proteins (ex: HIV)
Term
reverse transcriptase
Definition
enzyme that transcribes DNA from an RNA template, found in retroviruses
Term
HIV
Definition
human immunodeficiency virus, retrovirus
Term
vaccines
Definition
parts of a pathogen that are injected into a person to stimulate their immune system to mount defenses faster upon exposure
Term
viroids
Definition
naked circular RNA that infect plants- do not code for proteins, but can replicate in host plant cells to disrupt plant metabolism
Term
prions
Definition
infectious proteins; cause mad cow disease
Term
nucleoid
Definition
dense region of DNA in a bacteria, not bound by a membrane
Term
transformation
Definition
alteration of a bacterial cells' genotype by the uptake of naked, foreign DNA from the surrounding environment
Term
transduction
Definition
the transfer of bacterial DNA by a phage from one bacteria to another
Term
conjugation
Definition
direct transfer of genetic material between two bacterial cells that are temporarily joined
Term
F factor
Definition
fertility factor; maleness or ability to form sex pili in bacteria is confered by this gene
Term
plasmid
Definition
small, circular, self-replicating DNA molecule separate from the bacterial chromosome
Term
episome
Definition
genetic element that can replicate either as a plasmic or as part of the bacterial chromosome
Term
F plasmid
Definition
plasmid that is carrying the F factor (F+)
Term
R plasmid
Definition
genese conferring resistance to antibiotics are carried on these plasmids
Term
transposon
Definition
piece of DNA that can move from one location to another in a cell's genome
Term
insertion sequences
Definition
transposons that consist of only DNA necessary for the act of transposition (enzyme that catalyzes transposition)
Term
operator
Definition
segment of DNA that acts as an on switch
Term
operon
Definition
entire stretch of DNA required for a specific enzyme production in a metabolic pathway
Term
repressor
Definition
protein that can bind to the operator and turn it off
Term
regulatory gene
Definition
gene that codes for the repressor protein, located away from the operon is suppresses
Term
corepressor
Definition
small molecule that cooperates with a repressor protein to swith the operon off
Term
inducer
Definition
molecule that inactivates that repressor and allows for the operon to function and make the enzyme
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