Microbio Exam #3 Study Acellular Pathogens & Human Disease
Arthropods typically serve as which mechanism of transmission for viruses?
biological vector
A positive-strand RNA virus:
can be used directly to translate viral proteins.
How is kuru transmitted?
eating infected meat through cannibalism
The nucleic acid of a virus is
either DNA or RNA
Viruses can be visualized using which method?
electron microscope
Examples of cytopathic effects of viruses are
inclusion bodies giant cells multiple nuclei
Viruses that persist in the cell and cause recurrent disease are considered?
latent
Which of the followings cannot be used to culture viruses?
liquid medium only
A prophage is an early stage in the
lysogenic cycle.
Which of the following leads to the destruction of the host cells?
lytic cycle
The envelope of a virus is derived from the host's
membrane structures
Which of the following is NOT a cytopathic effect?
mononucleated cell
What is another name for a nonenveloped virus?
naked virus
"Mad Cow disease" is the result of infection of cattle with what type of agent?
prion
Transmissible spongiform encephalopathies, such as Creutzfeldt-Jakob disease, are caused by which of the following?
prion
Which of these infectious agents do not have nucleic acid?
prions
In the lysogenic cycle of bacteriophages, the integrated phage genome is known as which of the following?
prophage
In retroviruses, the integrated phage genome is known as which of the following?
provirus
A virus obtains its envelope during which of the following phases?
release
Which of the following components is brought into a cell by HIV?
reverse transcriptase
Which of the following is a novel enzyme found in retroviruses?
reverse transcriptase
Which of the following does a virus lack? Select all that apply.
ribosomes and metabolic processes
The liquid portion of blood that does not contain clotting factors is known as which of the following?
serum
Chicken pox can reemerge as which disease?
shingles
The component(s) of a virus that is/are extended from the envelope for attachment is/are the:
spikes
What is the name for the transfer of genetic information from one bacterium to another bacterium by a phage?
transduction
Which mechanism of horizontal gene transfer relies on the use of viruses?
transduction
The Baltimore Classification system describes viruses according to which characteristic?
viral genome
An acellular entity composed of a small circular RNA molecule without a capsid and capable of replicating its genome is known as which of the following?
viroid
Which of the following tests can be used to detect the presence of a specific virus?
EIA RT-PCR PCR
A zoonosis can only be transmitted from animals to humans. True or false?
False
Any virus can infect any host cell. True or false?
False
There is a cure for transmissible spongiform encephalopathies. True or false?
False
Which of the following is not a property of a virus?
It is an infectious cellular pathogen
RT-PCR relies on an enzyme encoded by retroviruses. True or false?
True
The capsid is composed of protein subunits called
capsomers
Which of the following viruses does not cause latent infections?
Adenovirus
Which of the following is the scientist responsible for first discovering viruses (specifically, tobacco mosaic virus)?
Dimitri Ivanovski
Viruses are facultative intracellular pathogens. True or false?
False
Which unit of length best describes the average size of a virion?
NM
Which statement regarding the introduction of virus in eggs is true?
Pox can form on the embryo
What is the definition of the eclipse phase?
When the virion enters the host cell
Which scientist first discovered prions?
Stanley Prusiner
Which of the following is true of prions?
They are a rogue form of protein, PrP.
The limitations in cell and tissue type of a particular host species is know as what?
Tropism
(+)ssRNA can be directly used in translation at the ribosome. True or false?
True
