PORTAGE LEARNING, MICROBIOLOGY MODULE 6 EXAM QUESTIONS WITH COMPLETE SOLUTIONS VERIFIED GRADED A+ LATEST UPDATE 2024/2025
virus
a small, non-cellular particle that cannot replicate unless inside a living host cell
obligate intracellular parasites
unable to replicate on their own
2 components o...
a small, non-cellular particle that cannot replicate unless inside a living host cell
obligate intracellular parasites
unable to replicate on their own
2 components of a virus
genomic material comprised of either DNA or RNA and a capsid
capsid
a membrane-like protective structure that contains the genetic material, similar to the
nucleus of a eukaryotic cell
are viruses prokaryotic or eukaryotic?
Neither, they are acellular
Viral genomes can be either ___________-stranded and may be found in
_________ arrangement
double- or single- / circular or linear
envelope
an additional layer around the capsid, derived from the host cell membrane and serves
as an additional barrier to the external environment
, naked (non-enveloped) virus
a virus simply surrounded by the protein capsid
The overwhelming majority of animal viruses are __________________ whereas
the majority of plant or bacteria-infecting viruses are not.
Enveloped
Differences in ________________ can also significantly influence the shape and
appearance of the virus.
virion composition
smallpox virus
an enveloped, ~ 200 nm long and has a distinct dumbbell shaped viral capsid
poliovirus
non-enveloped and only ~30 nm in diameter
Differences between viruses are best visualized via an ____________.
electron microscope
paramyxoviruses and orthomyxoviruses
both enveloped, spherical and ~100-150 nm in diameter but vary drastically in
composition and function
paramyxoviruses
the causative agent of measles and mumps, contain a single-stranded linear genome
and fuses with the host cell membrane to initiate entry and viral replication
orthomyxoviruses
the causative agent of the flu, contain eight segments of RNA and enters the host cell
via endocytosis
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