Viruses Flashcards
1
Q
characteristics
A
- noncellular (acellular)
- obligate intracellular parasites (must live inside a host to replicate and harm the host)
- cannot reproduce outside living cell
- can be cultured only inside living cells
2
Q
bacteriophage: lyric cycle
A
- attachment: capsid combines with receptor
- penetration: viral DNA enters host
- intergration: viral DNA passed in when bacteria reproduce*
- biosynthesis: viral components are synthesized
- maturation: assembly of viral components
- release: new viruses leave host cell
3
Q
lysogenic cycle
A
- viral DNA merges with cell DNA and does not destroy the cell
- the virus does not produce progeny
- there are no symptoms of viral infection
- becomes latent
- inter grated into the host genome
4
Q
production of animal viruses
A
- attachment: spike combines with receptor on animal cell
- entrance: viral enters cell and uncoating begins
- RNA replication: many copies of viral genome are made
- biosynthesis: viral components are made
- assembly: new viruses are now formed inside the animal cell
- budding: virus requires an envelope and spikes
5
Q
rabies
A
- fever
- headache
- nausea
- vomiting
- agitation
- anxiety
- confusion
- difficulty swallowing
6
Q
small pox
A
- fever
- overall discomfort
- severe fatigue
- headache
- severe back pain
- vomiting
- red sports appear on face hands forearms then trunk
7
Q
post polio syndrome
A
- Progressive muscle or joint weakness and pain
- General fatigue and exhaustion after minimal activity
- breathing or swallowing problems
8
Q
structure
A
- generally smaller than 200nm in diameter
- capsid -> some enveloped by membrane others naked
- nucleic acids -> DNA or RNA
- very in shape from thread like to polyhedral
9
Q
non paralytic polio
A
- fever
- sore throat
- headache
- vomiting
- fatigue
- back pain or stiffness
- meningitis
10
Q
paralytic polio
A
- loss of reflexes
- severe muscle aches or weakness
- lose floppy limbs
