Virus Characteristics Quiz

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Questions and Answers

What distinguishes different genera and families of viruses?

  • Presence of specific virion-associated transcriptase (correct)
  • Binding of viruses to the host cell membrane
  • Ether sensitivity
  • Viral genetic information becoming associated with host cells genetic information

Which process is characteristic of viruses exhibiting ether sensitivity?

  • Release into the cytoplasm after endocytosis
  • Endocytosis
  • Direct penetration of the membrane
  • Fusion of viral envelope with host cell membrane (correct)

What is the main function of neuraminidase in certain viruses?

  • Assisting in endocytosis
  • Budding through intracytoplasmic membrane
  • Mediating membrane fusion (correct)
  • Liberating viral nucleic acid

How do enveloped viruses deliver their nucleocapsid to the cytoplasm?

<p>By fusing their envelope with the plasma membrane (A)</p> Signup and view all the answers

What does viropexis involve in the process of viral entry into host cells?

<p>Direct penetration of the membrane (D)</p> Signup and view all the answers

Which symptomatology affects the nervous system?

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

What is the role of the viral nucleic acid genome?

<p>Contain information necessary for virus multiplication (A)</p> Signup and view all the answers

How do envelope viruses differ from other viruses?

<p>They rely on spontaneous macromolecular interactions for maturation (D)</p> Signup and view all the answers

What is the main function of the capsid in viruses?

<p>Capable of binding to target cells (C)</p> Signup and view all the answers

Why are envelope viruses not treated with usual antibiotics?

<p>Because they rely on antiviral agents for treatment (A)</p> Signup and view all the answers

What is the significance of the lipid bilayer in enveloped viruses?

<p>Contains molecules necessary for viral infection initiation (C)</p> Signup and view all the answers

How do non-enveloped viruses initiate infection compared to enveloped viruses?

<p>By binding their capsid to target cells (C)</p> Signup and view all the answers

What is responsible for the occurrence of multinucleated giant cells?

<p>Viral proteins insertion into cell membrane (A)</p> Signup and view all the answers

Which type of viruses complete maturation during or after budding from an altered host cell membrane?

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

How do enveloped viruses typically escape from the host cell?

<p>By budding through the outer membrane (C)</p> Signup and view all the answers

What is the process by which naked viruses release progeny virus from the host cell?

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

What happens when viral proteins are inserted into the host cell membrane?

<p>Occurrence of multinucleated giant cells (A)</p> Signup and view all the answers

How do enveloped virions acquire their viral envelope?

<p>By pushing host cell membrane (D)</p> Signup and view all the answers

What is the primary site of viral tropism where viruses enter for replication?

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

Where can viruses cause secondary site replication by entering the bloodstream?

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

What is the role of IgG antibodies in combating viruses?

<p>Activating immune response and enhancing T-cell recognition (B)</p> Signup and view all the answers

Which cells resist viral penetration by forming a barrier in the epidermis?

<p>Cells of the epidermis (B)</p> Signup and view all the answers

Which type of immunity is crucial in recovery from certain viral infections?

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

What type of cells separate blood from tissues and act as a barrier against viral invasion?

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

How do interferons contribute to combating viruses?

<p>Inhibiting viral replication (D)</p> Signup and view all the answers

Which immune cells are responsible for inducing delayed type hypersensitivity?

<p>CD4 T helper cells (B)</p> Signup and view all the answers

When are IgM antibodies typically produced during an infection?

<p>After 5 days of infection (A)</p> Signup and view all the answers

What happens to neutralized viruses after they are opsonized by macrophages?

<p>They are destroyed by immune cells (A)</p> Signup and view all the answers

Which cells produce specific lymphokines that function as the principal antiviral?

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

What is the function of fibroblast or beta interferon in combating viruses?

<p>Inhibiting viral replication (B)</p> Signup and view all the answers

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