Biology Ch. 19

an infectious particle consisting of genes packaged in a protein coat

consist of double or single stranded DNA or RNA

the protein shell enclosing the viral genome

a large number of protein subunits
what capsid are built from

surround the capsid of viruses
derived from membranes of host cells

viruses that infect bacteria

a limited number of host species

when a virus binds to a host cell and the viral genome makes its way inside

a phage replicative cycle that culminates in death of the host cell
produces new phages and lyses break open the host's cell wall

a phage that replicates only by the lytic cycle

replication of the phage genome without destroying the host
the viral DNA molecule is incorporated into the host cell's chromosome

phages that use both the lytic and lysogenic cycles

the integrated viral DNA

restrict a phage's ability to replicate within the bacterium

the RNA animal viruses with the most complicated replicative cycles

an enzyme that transcribes an RNA template into a DNA copy

the viral DNA that is integrated into the host genome
never leaves the host's genome

small, circular DNA molecules found in bacteria and yeasts

DNA segments that move from one location to another within a cell's genome

a harmless derivative of a pathogen that stimulates the immune system to mount defenses against the harmful pathogen

viruses that suddenly become apparent

widespread outbreak

global epidemic

infectious proteins that cause degenerative brain diseases in animals

they act very slowly with a long incubation period
prions are not destroyed by heating