Module 1 Flashcards
This are used to classify viruses based on its type and structural characteristics
Viral Nucleic Acids in the Virion
TRUE or FALSE:
If uninterrupted, single infectious particle can replicate to produce one of progeny virus
particle.
FALSE
TRUE or FALSE:
Retroviridae uses reverse transcriptase to create a DNA copy of their RNA genome
TRUE
TRUE or FALSE:
Are unfilterable agents that could not be cultivated on artificial media
FALSE:
They are filterable agents
General term to describe situations where mixed infections result in enhanced yields of one or both viruses in the mixture
Complementation
The mechanism by which a particular base sequence in messenger RNA produces a specific amino acid sequence in a protein
Translation
The means by which specific information encoded in a nucleic acid chain is transferred to messenger RNA
Transcription
These always contain altered host-cell membrane components
Envelope
TRUE or FALSE:
Non-enveloped viruses are resistant organic solvents
TRUE
Viruses contain how many types of nucleic acid?
1
Morphologic units composed of structural units embedded in the envelope
Peplomers
This virus family are considered to have diploid; containing two whole-genomic positive sense RNAs
Retroviridae
Complete infective virus particle; may be identical to the nucleocapsid; more complex virions
include the nucleocapsid + envelope
Virion
Outer coat of some viruses acquire as they penetrate or are budded from the nuclear or cytoplasmic membrane
Envelope
Viruses that cannot produce from their own nucleic acid and virions are non-infectious
Satellite Viruses
What virus family is made up of complex viruses with envelope
Herpesviridae and Paramyxoviridae
Functionally deficient particles in some aspect of replication and may interfere with the replication of normal viruses
Defective Virus
TRUE or FALSE:
ALL viruses are obligate intracellular parasites
TRUE
Period of time between the penetration of the virus particle into the host cell and the production of the
first new virus particle.
Eclipse period
RNA viruses has this property of it is able to directly capable of translation to protein
Positive sense
They require a helper virus for transmission and multiplication
Satellite Virus
RNA viruses has this property of it is of the same sense of mRNA
Positive sense
TRUE or FALSE:
RNA viruses have overall structure of genome is less complex
FALSE
What virus family is made up of simple viruses; their virion is composed of viral structural proteins and DNA
Parvoviridae
Smallest infectious agents causing disease in plants
Viroid
The capsid together with the enclosed nucleic acid
Nucleocapsid
RNA viruses has this property if it requires transcription of the genome to generate mRNA equivalent
Negative sense
TRUE or FALSE:
Disrupting cells during this period will interrupt the release of significant numbers of infectious virus
particles.
TRUE
Protein Shell that encloses the nucleic acid core
Capsid
This enzyme converts RNA into DNA
Reverse Transcriptase
Early bacteriologists believed that all contagious and infectious diseases were caused by ?
Bacteria
TRUE or FALSE:
ALL obligate intracellular parasites are viruses
FALSE
This is the major type of protein present on the exterior of the membrane of enveloped viruses
Glycoproteins
What are the two main classification systems of Viruses
- ICTV (International Committee on Taxonomy of Viruses)
- Baltimore Classification System
What’s the correct arrangement of viral replication
I. Intact virus particle ceases to exist (uncoating).
II. The virus attaches to a host cell.
III. Assembly and appearance of new progeny virus particles.
IV. Enters the cell.
V. Viral genome directs the production of new viral macromolecules.
II > IV > I > V > III
TRUE or FALSE:
Outside living cells, viruses can produce and replicate itself
FALSE
TRUE or FALSE:
Enveloped viruses are inactivated by inorganic solvents
FALSE
Morphologic units seen on the surfaces of icosahedral virus particles; represent clusters of structure units
Capsomeres
Many attribute the beginning of virology to the work of?
Ivanovsky and Beijerinck
Viruses that infect bacterial cells
Bacteriophages
Baltimore Classification System is developed by whom?
David Baltimore
ICTV was established on what year?
1966
What virus family is comprised of viral proteins and RNA
Picornaviridae
RNA viruses has this property of its genomic nucleotide sequence is complementary to the mRNA
Negative sense
Required by certain defective closely related viruses to replicate
Helper Virus
This classification system is based on genome type and mode of replication and transcription
Baltimore Classification System
TRUE or FALSE:
Some viruses contain nucleic acid molecules other than their genomic DNA or RNA.
TRUE
