Questions and Correct
Answers | New Update
What is a virus - ANSWER ✔✔a non-cellular and non-living infectious
agent with its own genome.
- obligate parasite
- much smaller than bacteria
what is an obligate parasite - ANSWER ✔✔relies on host cells for
replication and protein building
,What type of microscope is used to view viruses - ANSWER
✔✔electron microscopy
- SEM (3d) and TEM
What is a single virus particle called and what are the main structural
components of it - ANSWER ✔✔virion
- capsid which contains genetic material (DNA or RNA)
- Viral envelope (optional)
- Viral spikes
What are the three different shapes of capsids - ANSWER
✔✔Helical, icosahedral (20 sided), and complex (can be asymmetrical or
have a tail)
What are the two options of a viral envelope or no viral envelope called -
ANSWER ✔✔Viral envelope is a lipid coating that surrounds the
capsid formed from budding from the host cell
- naked virions aren't enveloped due to them lysing or bursting the host
cell
What are viral spikes made out of and what is their purpose -
ANSWER ✔✔Made out of glycoprotein
, - give virions their specificity, and allow for identification and binding to
host cell proteins
What are the three possible genome arrangements and which are for
DNA and RNA - ANSWER ✔✔Circular, linear, and segmented.
DNA is circular and linear, often ds, can be ss
RNA is linear and segmented, often ss, can be ds
How is a DsDNA translated to viral proteins - ANSWER
✔✔transcription to mRNA then translated to viral protein
How is a ssDNA translated to viral proteins - ANSWER
✔✔Complimentary DNA strand is built, then transcription to mRNA
occurs and transcription to viral protein occurs
How is ssRNA + translated to viral proteins - ANSWER ✔✔Translates
directly to viral protein
- Ex. Polio, rubella
How is ssRNA - ("antisense" rna) translated to viral proteins -
ANSWER ✔✔antisense has to be transcribed into the complimentary
sense strand
- requires RNA-dependent RNA polymerases" to translate to mRNA
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