chap 6 quiz
false
A portion of the viral envelope comes from the cell membrane of the host cell.
true
A portion of the viral envelope comes from the cell membrane of the host cell.
virus are classified as
Capsid structure presence/absence of an envelope genetic makeup
true
Enveloped viruses are usually released from the host cell by exocytosis.
true
Viral replication follows essentially the same steps as replication of a prokaryotic cell.
living animalas cultured cells bird embryos
Viruses can be cultured by
Most viral infections result in death of the host.
false
true
he hepadnavirus family is so named because viruses within the family infect the liver and possess DNA as their genetic material.
accurate statements about importance of prions and viroids and the diseases they cause?
vibroids pose significant problems in many econmically important crops prions induce abnormal folding in normal proteins prions infections have long latent periods
are reliant on a host cell for their own reproduction possess a capsid composed or protein
All viruses
False
Envelope viruses are usually released from the host cell by exocytosis
the host range of feline leukemia virus.
Feline leukemia virus may be lethal to cats but does not infect humans. This is a reflection of
Viroids pose significant problems in many economically important crops induce abnormal folding in normal proteins prion infection have long latents periods
Please select all the accurate statements about the importance of prions and viroids and the diseases they cause.
Type of capsid type of envelope nucleic acid strand number area of the host cell in which the virus multiplies
Please select the characteristics that are used to identify and name viruses.
TO isolate and identify viruses in clinical specimens To research viral structure , multiplicaton genetics, and effects on host cells to prepate viruses for vaccines
Primary purposes of viral cultivation include
transmissible spongiform encephalopahies Mad cow disease creutzfeldtx-Jakob
Prions are responsible for
Prions
Reisistant to rountine sterilization techniques Composed of protein with no RNA or DNA Able to alter the configuration of normal proteings in nerve cells
have two copies of single stranded RNA
Retroviruses
True
The polygenic mRNA codes for making one long polyprotein which is then cleaved into the separate individual virus proteins.
true
The polygenic mRNA codes for making one long polyprotein which is then cleaved into the separate individual virus proteins.
Double stranded viral DNA is intergrated into host cell chromosome
The provirus state exists when
true
The viral-host relationship is extremely important for pathogenicity, mode of transmission, the immune response, and the human measures used to control viral infections.
true
Viruses have played an important role in the evolution of Bacteria, Archaea, and Eukarya.
living animals trypticase soy agar cultured cells bird embryos
Viruses may be culture useing
the discovery that infectious fluid remained infectious even when passed through a filter designed to trap bacteria.
What data or achievement was instrumental to the initial characterization of viruses
the discovery that infectious fluid remained infectious even when passed through a filter designed to trap bacteria. Correct
What data or achievement was instrumental to the initial characterization of viruses
Contains proteins was once part of a host cell
What is true concerning the viral envelope?
Uncoating of the nucleic acid in cytoplasm
Which of the following does NOT represent an event in bacteriophage multiplication?
Viral genetic material is injected into the host cell.
Which step is present in bacteriophage multiplication but not in multiplication of an animal virus?
prions
are the only active biological agents lacking any nucleic acid (DNA or RNA).
false
f the virus is present as a provirus in the host cell, it remains latent and never produces new virus.
A long polygenic mrna is produced
If the DNA of the provirus is trasnscribed
false
The envelope is entirely formed from viral material
true
Viral nucleic acid enters the host cell and uses host cell's replication and synthesis machinery in order to produce new nucleic acid molecules, proteins for the capsid, spikes, and viral enzymes.
false
Virus are classified into species based on whether they can reproduce to produce fertile offspring, much like plants and animals.
true
Virus are classified into species based on whether they can reproduce to produce fertile offspring, much like plants and animals.
false
Viruses are routinely cultured in order to diagnose an infection.
living animals cultured cells bird embryos
Viruses can be cultured using
false
Viruses first appeared on Earth sometime after the rise of eukaryotic organisms.