Viral Classification Quiz
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Questions and Answers

Which of the following best describes the focus of virology?

  • Exploring the use of viruses in therapy
  • Studying the structure and evolution of viruses
  • Investigating the interaction of viruses with host organism physiology (correct)
  • Researching the techniques to isolate and culture viruses

What did Martinus Beijerinck identify as a novel pathogen, marking the official beginning of virology as a discipline?

  • Rabies virus
  • HIV
  • Influenza virus
  • Tobacco mosaic disease (TMV) (correct)

What is the defining characteristic of viruses?

  • They are capable of independent energy production
  • They are obligate intracellular parasites (correct)
  • They can replicate by division
  • They have both RNA and DNA in their genome

What type of genomes can viruses possess?

<p>Either RNA or DNA but not both (A)</p> Signup and view all the answers

How do viruses replicate?

<p>By assembling viral components (A)</p> Signup and view all the answers

What did Beijerinck use the term 'virus' to describe?

<p>'Contagious living fluid' (A)</p> Signup and view all the answers

Which term best describes the relationship between viruses and host cells?

<p>'Parasitic' (B)</p> Signup and view all the answers

What is the primary focus of medical virology?

<p>'Investigating viruses in relation to human diseases' (B)</p> Signup and view all the answers

'Virology' is a subfield of which scientific discipline?

<p>'Microbiology' (A)</p> Signup and view all the answers

What is the most common morphology exhibited by viruses?

<p>Naked capsid (A)</p> Signup and view all the answers

What term describes the ability of a virus to exploit host cells?

<p>Parasitism (D)</p> Signup and view all the answers

Who identified the causative agent of tobacco mosaic disease as a novel pathogen?

<p>Martinus Beijerinck (B)</p> Signup and view all the answers

What is the size range of clinically important viruses?

<p>18nm to 300nm (A)</p> Signup and view all the answers

Which theory suggests that viruses are degenerate forms of intracellular parasites?

<p>Regressive theory (A)</p> Signup and view all the answers

What is the term for a viral particle functionally deficient in some aspects of replication?

<p>Defective virus (B)</p> Signup and view all the answers

What is the term for the protein coat that encloses the viral nucleic acid genome?

<p>Capsid (D)</p> Signup and view all the answers

Which type of virus has an envelope composed of lipid-containing membrane?

<p>Enveloped virus (B)</p> Signup and view all the answers

What is the term for complete and infective viral particles that transfer viral nucleic acid from cell to cell?

<p>Virion (D)</p> Signup and view all the answers

Which symmetry type is considered the most efficient arrangement for subunits in a closed shell?

<p>Icosahedral or cubic symmetry (C)</p> Signup and view all the answers

Which of the following is NOT considered as a major component of a virus?

<p>Ribosomal RNA (C)</p> Signup and view all the answers

What is the range of size for clinically important viruses?

<p>18nm to 300nm (D)</p> Signup and view all the answers

According to the evolutionary origin theories, which theory suggests that viruses are degenerate forms of intracellular parasites?

<p>Regressive theory (C)</p> Signup and view all the answers

What is the term for viral particles functionally deficient in some aspects of replication?

<p>Defective virus (B)</p> Signup and view all the answers

Which symmetry type is considered the most efficient arrangement for subunits in a closed shell?

<p>Icosahedral symmetry (C)</p> Signup and view all the answers

What is the term for the protein coat that encloses the viral nucleic acid genome?

<p>Nucleocapsid (A)</p> Signup and view all the answers

Which theory suggests that viruses coevolved with life (free living cells)?

<p>Co-evolution theory (C)</p> Signup and view all the answers

What is the term for complete and infective viral particles that transfer viral nucleic acid from cell to cell?

<p>Virion (C)</p> Signup and view all the answers

Which term describes abnormal infectious protein molecules that can spread & change the structure of their normal counterparts?

<p>Prions (C)</p> Signup and view all the answers

What does an enveloped virus comprise?

<p>Capsid, envelope, nucleic acid (B)</p> Signup and view all the answers

What is the term for the basic protein building blocks of the coat, seen in electron microscope on the surface of icosahedral viral particles?

<p>Capsomers (D)</p> Signup and view all the answers

What is the term for a lipid-containing membrane that surrounds some viral particles?

<p>Envelope (C)</p> Signup and view all the answers

Which term best describes the relationship between viruses and host cells?

<p>Parasitic (D)</p> Signup and view all the answers

What is the term for the protein coat that encloses the viral nucleic acid genome?

<p>Capsid (C)</p> Signup and view all the answers

What is the size range of clinically important viruses?

<p>50–100 nanometers (A)</p> Signup and view all the answers

Which type of virus has an envelope composed of lipid-containing membrane?

<p>Retrovirus (C)</p> Signup and view all the answers

What term describes the ability of a virus to exploit host cells?

<p>Pathogenicity (D)</p> Signup and view all the answers

What did Martinus Beijerinck identify as a novel pathogen, marking the official beginning of virology as a discipline?

<p>Virus (A)</p> Signup and view all the answers

What is the primary focus of medical virology?

<p>Viral interaction with host physiology and immunity (C)</p> Signup and view all the answers

'Virology' is a subfield of which scientific discipline?

<p>Microbiology (B)</p> Signup and view all the answers

What is the term for complete and infective viral particles that transfer viral nucleic acid from cell to cell?

<p>Virion (C)</p> Signup and view all the answers

What did Beijerinck use the term 'virus' to describe?

<p>A novel pathogen (D)</p> Signup and view all the answers

What type of genomes can viruses possess?

<p>Single-stranded RNA or DNA but not both (B)</p> Signup and view all the answers

What is the defining characteristic of viruses?

<p>Lack of energy production (B)</p> Signup and view all the answers

What is the primary function of a virus particle?

<p>To deliver its DNA or RNA genome into the host cell (C)</p> Signup and view all the answers

What is the term used for the protein coat enclosing the viral nucleic acid genome?

<p>Nucleocapsid (B)</p> Signup and view all the answers

What characteristic differentiates viruses from other living organisms?

<p>Requirement of a host cell for replication (D)</p> Signup and view all the answers

What is the term for a complete and infective viral particle that transfers viral nucleic acid from cell to cell?

<p>Virion (D)</p> Signup and view all the answers

Which type of virus has an envelope composed of lipid-containing membrane?

<p>Retrovirus (B)</p> Signup and view all the answers

What is the term for functionally deficient viral particles?

<p>Defective virus (B)</p> Signup and view all the answers

Which scientist identified the causative agent of tobacco mosaic disease as a novel pathogen, marking the official beginning of virology as a discipline?

<p>Martinus Beijerinck (C)</p> Signup and view all the answers

What did Martinus Beijerinck use the term 'virus' to describe?

<p>'Filterable infectious agent' (B)</p> Signup and view all the answers

Which symmetry type is considered the most efficient arrangement for subunits in a closed shell?

<p>Icosahedral symmetry (D)</p> Signup and view all the answers

According to evolutionary origin theories, what theory suggests that viruses are degenerate forms of intracellular parasites?

<p>Regressive hypothesis (C)</p> Signup and view all the answers

What is the size range of clinically important viruses?

<p>70-90 nm (A)</p> Signup and view all the answers

What is the term for the protein building blocks of the coat in icosahedral viral particles?

<p>Capsid (D)</p> Signup and view all the answers

Which type of genome necessitates different replication strategies?

<p>Single stranded (ss) RNA (B)</p> Signup and view all the answers

What is the term for the morphologic subunits of the icosahedron?

<p>Capsomeres (B)</p> Signup and view all the answers

Which characteristic is not used as a parameter for classifying viruses?

<p>Morphology (C)</p> Signup and view all the answers

What is the term for the genomic RNA strand of single-stranded RNA viruses that can serve as mRNA?

<p>Sense (positive sense, plus sense) (C)</p> Signup and view all the answers

Which viruses are transmitted by blood-sucking arthropods and vertebrate hosts?

<p>Athropod-borne viruses (C)</p> Signup and view all the answers

Which family does not contain viruses that infect humans and animals?

<p>-virinae- family (A)</p> Signup and view all the answers

Which major grouping is based on physicochemical or serologic properties within virus families?

<p>-virus- genus (A)</p> Signup and view all the answers

What is the term for the site of capsid assembly and, in enveloped viruses, the site of envelopment?

<p>Viral assembly complex (B)</p> Signup and view all the answers

Which type of virus exhibits helical morphology in its nucleocapsids?

<p>&quot;Filamentous&quot; viruses (D)</p> Signup and view all the answers

Which type of genetic material can occupy either one nucleic acid molecule or several nucleic acid segments?

<p>Multipartite genome (A)</p> Signup and view all the answers

What is the term for the characteristic involving involvement of vectors or vertebrate reservoirs in virus transmission?

<p>Ecological properties (B)</p> Signup and view all the answers

What is the primary basis for separating viruses into major groupings called families?

<p>Genome structure (C)</p> Signup and view all the answers

Which type of virus has an envelope composed of lipid-containing membrane?

<p>Filoviruses (D)</p> Signup and view all the answers

What is the primary focus of medical virology?

<p>Developing antiviral drugs (B)</p> Signup and view all the answers

Which symmetry type is considered the most efficient arrangement for subunits in a closed shell?

<p>Icosahedral (D)</p> Signup and view all the answers

What is the term for the protein coat that encloses the viral nucleic acid genome?

<p>Capsid (B)</p> Signup and view all the answers

What is the range of size for clinically important viruses?

<p>$10^{-9}$ to $10^{-6}$ meters (A)</p> Signup and view all the answers

What term describes the ability of a virus to exploit host cells?

<p>Pathogenesis (A)</p> Signup and view all the answers

Which type of genomes can viruses possess?

<p>ssDNA and dsDNA (C)</p> Signup and view all the answers

What is the term for complete and infective viral particles that transfer viral nucleic acid from cell to cell?

<p>Virion (D)</p> Signup and view all the answers

'Virology' is a subfield of which scientific discipline?

<p>'Microbiology' (C)</p> Signup and view all the answers

'Rhabdoviridae' is known for which characteristic?

<p>'Enveloped structure' (C)</p> Signup and view all the answers

What is the term for a lipid-containing membrane that surrounds some viral particles?

<p>'Envelope' (B)</p> Signup and view all the answers

Which theory suggests that viruses coevolved with life (free living cells)?

<p>'Coevolution hypothesis' (D)</p> Signup and view all the answers

Which type of virus exhibits helical morphology in its nucleocapsids?

<p>Rhabdoviruses (B)</p> Signup and view all the answers

What is the term for the basic protein building blocks of the coat, seen in electron microscope on the surface of icosahedral viral particles?

<p>Capsomere (B)</p> Signup and view all the answers

Which family of viruses has an envelope composed of lipid-containing membrane?

<p>Flaviviridae (C)</p> Signup and view all the answers

What did Martinus Beijerinck identify as a novel pathogen, marking the official beginning of virology as a discipline?

<p>Tobacco mosaic virus (C)</p> Signup and view all the answers

What is the term for complete and infective viral particles that transfer viral nucleic acid from cell to cell?

<p>Virion (D)</p> Signup and view all the answers

'Rhabdoviridae' is known for which characteristic?

<p>SS (-) RNA genome (A)</p> Signup and view all the answers

'Virology' is a subfield of which scientific discipline?

<p>Microbiology (C)</p> Signup and view all the answers

'Virology' is a subfield of which scientific discipline?

<p>Microbiology (B)</p> Signup and view all the answers

How are capsids formed in enveloped viruses?

<p>By self assembly of multiple protein copies (A)</p> Signup and view all the answers

What is the classification criteria based on size and shape of viruses?

<p>Morphology (C)</p> Signup and view all the answers

What is the characteristic of helical nucleocapsids?

<p>Helical array of capsid proteins wrapped around a helical filament of nucleic acid (C)</p> Signup and view all the answers

Which type of viruses may have an outer envelope?

<p>Enveloped viruses (D)</p> Signup and view all the answers

What is used as a basis for separating viruses into major groupings called families?

<p>Genome structure and mode of replication (D)</p> Signup and view all the answers

What is the defining characteristic of arboviruses?

<p>Transmitted by blood-sucking arthropods and vertebrate hosts (D)</p> Signup and view all the answers

What is the suffix used for virus families?

<p>-viridae- (C)</p> Signup and view all the answers

What is the characteristic of some nucleic acid genomes of viruses?

<p>Linear or circular (A)</p> Signup and view all the answers

"Positive sense" orientation of viral RNA refers to what characteristic?

<p>&quot;Sense&quot; orientation that can serve as mRNA (A)</p> Signup and view all the answers

What is the main function of a virion?

<p>To deliver its DNA or RNA genome into the host cell (C)</p> Signup and view all the answers

Which of the following best describes the structure of viruses?

<p>Contain either a RNA or DNA genome surrounded by a protective protein coat (A)</p> Signup and view all the answers

What is the term for the site of capsid assembly and, in enveloped viruses, the site of envelopment?

<p>Golgi apparatus (D)</p> Signup and view all the answers

What is the term for a complete virus particle?

<p>Virion (A)</p> Signup and view all the answers

What is the term for the nucleic acid-associated protein together with the viral genome?

<p>Nucleocapsid (B)</p> Signup and view all the answers

What is the defining characteristic of viruses?

<p>Dependence on host cells for replication (D)</p> Signup and view all the answers

'Rhabdoviridae' is known for which characteristic?

<p>Enveloped virus with helical morphology (A)</p> Signup and view all the answers

What is the term for the protein building blocks of the coat in icosahedral viral particles?

<p>'Capsomeres' (A)</p> Signup and view all the answers

Which type of genetic material can occupy either one nucleic acid molecule or several nucleic acid segments?

<p>'Segmaviruses' (C)</p> Signup and view all the answers

Which type of virus has an envelope composed of a lipid-containing membrane?

<p>Helical morphology in its nucleocapsids. (D)</p> Signup and view all the answers

What is the term for functionally deficient viral particles?

<p>Viroporin. (B)</p> Signup and view all the answers

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