Virus Characteristics Quiz

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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?

By fusing their envelope with the plasma membrane Signup and view all the answers

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

Direct penetration of the membrane Signup and view all the answers

Which symptomatology affects the nervous system?

Neurotrophic Signup and view all the answers

What is the role of the viral nucleic acid genome?

Contain information necessary for virus multiplication Signup and view all the answers

How do envelope viruses differ from other viruses?

They rely on spontaneous macromolecular interactions for maturation Signup and view all the answers

What is the main function of the capsid in viruses?

Capable of binding to target cells Signup and view all the answers

Why are envelope viruses not treated with usual antibiotics?

Because they rely on antiviral agents for treatment Signup and view all the answers

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

Contains molecules necessary for viral infection initiation Signup and view all the answers

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

By binding their capsid to target cells Signup and view all the answers

What is responsible for the occurrence of multinucleated giant cells?

Viral proteins insertion into cell membrane Signup and view all the answers

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

Enveloped viruses Signup and view all the answers

How do enveloped viruses typically escape from the host cell?

By budding through the outer membrane Signup and view all the answers

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

Lysis Signup and view all the answers

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

Occurrence of multinucleated giant cells Signup and view all the answers

How do enveloped virions acquire their viral envelope?

By pushing host cell membrane Signup and view all the answers

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

Respiratory tract Signup and view all the answers

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

Bloodstream Signup and view all the answers

What is the role of IgG antibodies in combating viruses?

Activating immune response and enhancing T-cell recognition Signup and view all the answers

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

Cells of the epidermis Signup and view all the answers

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

Cellular immunity Signup and view all the answers

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

Endothelial cells Signup and view all the answers

How do interferons contribute to combating viruses?

Inhibiting viral replication Signup and view all the answers

Which immune cells are responsible for inducing delayed type hypersensitivity?

CD4 T helper cells Signup and view all the answers

When are IgM antibodies typically produced during an infection?

After 5 days of infection Signup and view all the answers

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

They are destroyed by immune cells Signup and view all the answers

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

T lymphocytes Signup and view all the answers

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