Viruses Flashcards
What parts of living organisms do viruses have?
nucleic acids
reproduction
evolution
What parts of living organisms do viruses lack?
cell structure
independent metabolism
interaction with environment
growth and development
What are viruses considered to be?
obligate intracellular parasites
-tiny infection particles
What kind of nucleic acids do viruses contain?
Which are most common?
RNA: RNA virus
DNA: DNA virus
(both are either single or double stranded viruses)
Most common: DS, DNA viruses
What surrounds the viruses nucleic acids?
protein capsid
Capsids may be what shape?
helical
polyhedral
combo of both
What is an enveloped virus?
the host’s cell surrounds the capsid
Viruses can attack anyone and anything
False, they are extremely host-specific
What are the 3 types of symbiotic relationships?
mutualism
commensalism
parasitism
What is commensalism (in a symbiotic relationship)?
SR that benefits one party but does not harm the other (host)
What is mutualism (in a symbiotic relationship)?
SR that benefits both parties equally
What is parasitism?
SR that benefits one party at the degradation of the other
What are the two types of virus cycles?
Lytic cycle
Lysogenic cycle
What are the Lytic cycle steps?
(From virulent viruses)
- attachment
- penetration
- replication
- assembly
- release
What are the Lysogenic cycle steps
(From temperate viruses)
- attachment
- penetration
- hibernation
- duplication
- trigger
