micro quiz 5

Host range is limited by the

. type of host cell receptors on cell membrane.

During lysogeny, an inactive prophage state occurs when the viral DNA is inserted into the host ___

DNA

Which of the following will not support viral cultivation?

Live lab animals b. Primary cell cultures c. Continuous cell cultures d. Embryonated bird eggs all of the above

Which of the following is/are type(s) of cytopathic effects?

Multinucleated giant cells b. Rounding of cells c. Inclusions in the nucleus d. Inclusions in the cytoplasm all are correct

Which of the following occurs during assembly?

The nucleocapsid is formed and viral spikes insert in host cell membrane

The correct sequence of events in viral multiplication is

adsorption, penetration, uncoating, synthesis, assembly, and release. Correct

Diagnosis of viral infections sometimes involves analyzing the patient's blood for specific _____ that the immune system produces against the virus.

antibodies

Viruses that infect bacteria are specifically called

bacteriophages

Viral capsids are made from subunits called ______.

capsomeres

A common method for cultivating viruses in the lab is to use in vitro systems called _____ cultures.

cell

Persistent viruses that can reactivate periodically are ___

chronic latent viruses

Viruses attach to their hosts via ______.

host glycoproteins

In transduction, the viral genome

includes DNA from the previous host

The activation of a prophage is called __

induction

T- even phages

infect Escherichia coli cells

The event that occurs in bacteriophage multiplication that does not occur in animal virus replication is

injection of only the viral nucleic acid into the host cell

Viruses that cause infection resulting in alternating periods of activity with symptoms and inactivity without symptoms are called ______.

latent

Oncogenic viruses include all the following except ______

measles virus

A naked virus only has a/an

nucleocapsid

In general, most DNA viruses multiply in the host cell's _____, while most RNA viruses multiply in the host cell's

nucleus: cytoplasm

uncoating of viral nucleic acid

occurs during penetration in the multiplication cycle. b. does not occur in bacteriophage multiplication. c. involves enzymatic destruction of the capsid. d. occurs before replication. all of the above

Mammalian viruses capable of starting tumors are ______.

oncoviruses

Visible, clear, well-defined patches in a monolayer of virus-infected cells in a culture are called ______.

plaques

Two noncellular agents, smaller than viruses, are infectious proteins called _____ and infectious RNA strands called _____.

prions: viroids

Viruses acquire envelopes around their nucleocapsids during ______.

release

What structures are used by bacteriophages to attach to host cell receptors?

tail fibers

What type of phage enters an inactive prophage stage?

temperate

Lysogeny refers to

the viral genome inserting into bacterial host chromosome

Which of the following represents a virus family name?

a. Hepatitis B virus b. Herpesviridae Correct c. Picornavirus d. Enterovirus e. Herpes simplex virus herpesviridae

 Viruses exhibit all the following except ______

a. ultramicroscopic size b. definite shape c. metabolism Correct d. genes e. ability to infect host cells metabolism