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Chapter 19 Viruses (diffrent shapes (bactériophages infect bacteria (most…
Chapter 19 Viruses
diffrent shapes
polyhedral
rod shaped
enclosed in capsids
bactériophages infect bacteria
most complex virus
Defense against this is called restriction enzyme
RNA animal virus is retrovirus
These contain reverse transcriptase
provirus
never leaves the host cell
infectious particle
not eukaryotic
Not prokaryotic
causes infection
cause disease
simple structure
Lacks cellular machinery
Hijacks the infected cell
not alive
between a life form and chemical
nucleic acid surrounded by protein coat
Two types
RNA virus
can only replicate in RNA cells
DNA virus
Can only replicate in DNA cells
Bacteriophages are an exception
Two Cycles
Lytic Cycle
The last stage
Destroys The bacterium
Lysogenic Cycle
Synthesis of proteins and genomes
self assembly
Hyjacks DNA
Viral DNA is prophage
release
Attachment
virus can only replicate in host cell
virus have host range
this is how many host they can infect
some only have one
others infect animals and humans
pandemic is global
epidemic is continental