Microbiology Quiz #4

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Last updated: May 4, 2024

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First submitted	May 4, 2024
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Average score	62.1%
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Hint	Answer
A regular polyhedron with 20 equilateral faces and 12 vertices	Icosahedral
Acellular entity which is composed of protein and nucleic acid, lacks metabolism and replicates only in host cells	Virus
Outer, membranous layer of a virus	Envelope
Baltimore group containing dsDNA viruses	I/1
Baltimore group containing ssDNA viruses	II/2
Baltimore group containing RNA reverse transcribing viruses	VI/6
Non-translated ssRNAs, lack protein (Infect plants)	Viroids
Contained in all virions and composed of nucleic acid and a protein coat	Nucleocapsid
Which virus formed complex can be hijacked by virophage?	Membrane protected replication complexes
What enzyme do Baltimore groups 3 and 5 carry in order to make genome readable by host ribosomes?	RNA dependent RNA polymerase/RDRP
Large macromolecular structure which serves as the protein coat of a virus	Capsid
Capsid shaped like hollow tubes with protein walls	Helical
Baltimore group containing positive sense ssRNA viruses	IV/4
Subviral infectious agents composed of nucleic acid and protein that require a helper virus to replicate	Satellites
What enzyme is used by some viruses to convert RNA into DNA?	Reverse transcriptase

Hint	Answer
What can some viruses form from the walls of the ER in order to avoid host response?	Membrane protected replication complexes
Which viral entry method can be used by enveloped and unenveloped viruses?	Receptor mediated endocytosis
Which type of virus can use host actin tails to propel through host membrane?	Poxviruses
What can many plant viruses use to propel themselves from cell to cell?	Plasmodesmata
Where are viruses assembled in a cell?	Cytoplasm
Which viral entry method can be used by only enveloped viruses?	Membrane Fusion
Where do Baltimore group 1 viruses normally replicate?	Nucleus
Through which process are viral particles released from a cell?	Budding
Ring or knob-shaped units made of 5 or 6 protomers	Capsomer
Infectious proteins, cause spongiform encephalopathies (BSE, scrapie, CJD)	Prions
Virus that infects bacteria	Bacteriophage
Baltimore group containing negative sense ssRNA viruses	V/5
Baltimore group containing dsRNA viruses	III/3
Baltimore group containing DNA reverse transcribing viruses	VII/7

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