Viruses

Question 1

characteristics

Answer 1

• 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

Question 2

bacteriophage: lyric cycle

Answer 2

• 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

Question 3

lysogenic cycle

Answer 3

• 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

Question 4

production of animal viruses

Answer 4

• 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

Question 5

rabies

Answer 5

• fever
• headache
• nausea
• vomiting
• agitation
• anxiety
• confusion
• difficulty swallowing

Question 6

small pox

Answer 6

• fever
• overall discomfort
• severe fatigue
• headache
• severe back pain
• vomiting
• red sports appear on face hands forearms then trunk

Question 7

post polio syndrome

Answer 7

• Progressive muscle or joint weakness and pain
• General fatigue and exhaustion after minimal activity
• breathing or swallowing problems

Question 8

structure

Answer 8

• 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

Question 9

non paralytic polio

Answer 9

• fever
• sore throat
• headache
• vomiting
• fatigue
• back pain or stiffness
• meningitis

Question 10

paralytic polio

Answer 10

• loss of reflexes
• severe muscle aches or weakness
• lose floppy limbs