viruses (exam3) Flashcards
Do viruses have a plasma membrane?
no
Why do viruses need to attach to host cells to replicate?
they cannot carry out transcription or translation on their own
Epidemic
a widespread occurrence of a disease in a community at a specific time
Pandemic
a widespread occurrence of a disease affecting multiple areas
Virulence
the ability of a microorganism to cause disease in the host
Uncoating
a process in which the viral capsid of a virus is removed, leading to the release of the viral genomic nucleic acid
What are the 6 stages of viral replicative growth?
1.viral genome enters the host bacteria
2.viral genome is transcribed, producing viral proteins
3.viral genome is replicated
4.particles assemble inside host
5.particles exit to exterior
6.free virions in tissue or environment are transmitted to a new host
Why would the virion take a piece of the host membrane upon leaving?
the membrane contains specialized membrane proteins that allow the virus to go undetected by the surrounding cells
Does the host or virus RNA polymerase operate transcription?
they both can
Does the host or virus operate translation?
host
What two things do DNA viruses need from the host?
-nucleotide polymers
-DNA polymerase
What one thing do RNA viruses need from the host cell?
ribonucleotides
What’s the pattern for RNA replication in viruses?
-ssRNA (1)
-dsRNA (1)
-ssRNA (3)
What does reverse transcriptase do?
removes the RNA strand and catalyzes the synthesis of second DNA strand
What is the difference between budding and lysing?
when viruses leave the host cell while budding, they take a porting of the host membrane with them
