Chapter 5/8: Viral Replication Assembly and Release Flashcards
What class of viruses include dsDNA viruses like papillomavirus?
Class I
What class of viruses include +ssRNA viruses like SARs virus?
Class IV
What class of viruses include -ssRNA viruses like rabies virus?
Class V
What class of viruses include retroviruses like HIV?
Class VI
What type of host is a class I virus found in?
Animal host
What does a class I virus use to replicate its genome in the host?
DNA polymerase
Where are new class I virions formed?
Host Nucleus
What type of host is a class IV virus found in?
Animal host
What does a class IV virus require?
RNA-dependent RNA polymerase
What is the RNA-dependent RNA polymerase encoded on in a class IV virus?
+ssRNA
What is translated immediately into viral proteins including the polymerase, capsid, and packaging proteins in a class IV virus?
+ssRNA
What is used as a template for viral genome replication in a class IV virus?
-ssRNA
Where does genome replication occur in a class IV virus host?
Cytoplasm
What type of host is a class V virus found in?
Animal host
What type of virus class requires an RNA-dependent RNA polymerase which must be packaged along with the genome?
Class V
What must -ssRNA be converted to before translation of viral capsid and packaging proteins can occur?
+ssRNA
What is used for template in genome replication in class V viruses?
+ssRNA
Where does genome replication occur in a class V virus host?
Cytoplasm
What type of ssRNA is contained in class VI viruses?
+ssRNA
What is required to create dsDNA in class VI viruses?
Reverse transcriptase
What is used to integrate dsDNA into host genome in class VI viruses?
Integrase
What three components are carried in a retrovirus capsid?
Reverse transcriptase, Integrase, HIV-1 protease
What term is used to describe when the virus genome is integrated into the host genome?
Provirus
What type of bacteriophage infections occur when phages replicate inside host cells then lyse the host cells to release new virions?
Lytic (virulent) infections
What type of bacteriophage infections occur when phages integrate their genome into the host cell genome and are replicated each time the host cell undergoes binary fission?
Lysogenic (temperate) infections
What term describes when phages integrate their genome into the host cell genome?
Prophage
What is the name for the host cell in Lysogenic infections?
Lysogen
What is an example of a lysogenic phage?
Lambda phage
What is an example of a lytic phage?
T4 phage
What type of viruses have capsid proteins interact with packaging sequences on viral genome to coalesce around nucleic acid?
Helical viruses
What two types of viruses have empty capsids that partially form then have viral genomes inserted into them?
Isosahedral, Bacteriophage
How do naked viruses almost always exit a cell?
Lysis
How do plant viruses move from cell to cell within one plant?
Cytoplasmic connections
How do enveloped viruses exit from host cells?
Budding
What is the name for viral proteins?
Peplomers
