micro chap 5 quiz all attempts

Which of the following will not support viral cultivation?

Live lab animals Embryonated bird eggs Primary cell cultures Continuous cell cultures

t/f Viral spikes are inserted into the host cell membrane before budding or exocytosis.

TRUE: Viral spikes are inserted into the host cell membrane before budding or exocytosis.

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

Tail fibers

What type of phage enters an inactive prophage stage?

Temperate

What is the rationale for providing intravenous fluids and oxygen support for this patient?

These measures are supportive therapies while the disease runs its course

Which of the following is a type of cytopathic effect? Show answer choices Inclusions in the nucleus Multinucleated giant cells Inclusions in the cytoplasm Cells change shape All of the choices are correct

all the choices are correct

Viruses that infect bacteria are specifically called _____.

bacteriophages

A(n) _______ is the protein shell around the nucleic acid core of a virus.

capsid

Virus capsids are made from subunits called _____.

capsomeres

A common method for cultivating viruses in the lab is to use in vitro systems called _____ cultures. Show answer choices embryo cell plaque bacteriophage egg

cell

Viral genetic studies, vaccine development and clinical identification would not be possible without the ability to________.

culture virusesin vivo andin vitro

Which of the following is not a characteristic of a transformed cell? Show answer choices Viral nucleic acid integrated into host DNA Decreased growth rate Alterations in chromosomes Changes in cell surface molecules Capacity to divide indefinitely

decreased growth rate

Satellite viruses are ________.

dependent on other viruses for replication

A specific animal virus has the ability to attach to and enter almost any animal host cell. T True F

false

Glycoprotein spikes are essential for mediating the release stage of the viral life cycle. t/f

false

T/F Glycoprotein spikes are essential for mediating the release stage of the viral life cycle.

false

The adeno-associated virus (AAV) is a prion. t/f

false

Viruses are ultramicroscopic because they range in size from 2 mm to 450 mm T/F

false

Viruses attach to their hosts via ________.

host glycoproteins

The activation of a prophage is called _____.

induction

T-even phages ________.

infect Escherichia coli cells

Viruses that cause infection resulting in alternating periods of activity with symptoms and inactivity without symptoms are called _____. Show answer choices latent oncogenic prions viroids delta agents

latent

Viruses have all the following except ________. definite shape metabolism genes the ability to infect host cells ultramicroscopic size

metabolism

Cells grown in culture form a(n) _____.

monolayer

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

Infectious protein particles are called _____

prions

Infectious protein particles are called _____.

prions

Two noncellular agents, smaller than viruses, are the infectious proteins called _______ and the infectious RNA strands called ________.

prions; viroids

Viral spikes ________.

protrude from the envelope

Viruses acquire envelopes around their nucleocapsids during _____.

release

T/F When a virus enters a host cell, the viral genes redirect the genetic and metabolic activities of the host cell.

true

Viruses are unable to multiply outside of a host cell. T/F

true

t/f Prophages can be activated into viral replication and enter the lytic cycle.

true

t/f Viruses are simple, noncellular, and lack ribosomes.

true

Host range is limited by________.

type of host cell receptors on cell membrane

The process of dissolving the envelope and capsid to release the viral nucleic acid is _____.

uncoating

Lysogeny refers to ________.

viral genome inserting into bacterial host chromosome

Infectious naked strands of RNA that affect plants are called _____

viroids

The development of antiviral drug therapy is difficult because ________.

viruses are obligate intracellular parasites so the host cell can be harmed by the drug

Creutzfeldt-Jacob disease is ________.

a spongiform encephalopathy of humans