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Virology Final Exam Questions with Correct Answer4
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Virology Final Exam Questions with Correct Answer4
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Virology Final Exam Questions with Correct AnswersWhat are 4 positive ways viruses have impacted society? Correct
Answer-phage typing of bacteria
sources of enzymes (reverse transcriptase, RNA polymerase,
thermostable)
antibacterial agents
anticancer agents
gene vectors for protein production
gene vectors for treatment of genetic diseases
Working with the tobacco mosaic virus how was scientific evidence first
provided that very small infectious agents such as viruses existed?
Correct Answer-Diseased plant extract was passed through a filter too
small for bacteria. The extract could cause disease in healthy plants even
when diluted through multiple generations of plants.
List the 4 general types of nucleic acids found in the genomes of viruses.
Which are exclusive to viral? Correct Answer-dsDNA
ssDNA
dsRNA
ssRNA
ssRNA and ssDNA are exclusive to viral genomes.
Viral genomes are relatively small, so how can a virus come up with all
it's needed proteins? List three ways presented in class. Correct Answer-
Use host cell proteins.
,Code efficiently with overlapping genes or genes encoded within genes.
Produce multifunctional proteins.
According to the text book and this class what is the definition of virus?
Correct Answer-Small, non-cellular parasite of cells. Genome is
composed of DNA or RNA, and is enclosed in protein coat.
Outside of their host cells, viruses survive as virus particles known as
what? Correct Answer-Virion
What is a pseudoknot and where are they located? Describe one function
of a pseudoknot. Correct Answer-A region of secondary structure in
ssRNA. Some have enzyme activity or play a role in ribosomal frame
shifting.
Influenza virus has eight segments in its genome. How can this be an
advantage to the virus? What is a possible disadvantage? Correct
Answer-Allows for more rapid evolution by making new combinations.
Need to pack all eight segments into each virion.
As the size of the viral genome _______, the number of protein species
tends to ___________. Correct Answer-Increases/increases
Describe three functions of capsids. Correct Answer-Protect the genome
Recognize and attach to host cells.
, Ensure the virus genome is transported to the location within the cell
where the genome can be transcribed and replicated, able to release
genome.
List two things that a virus might take upon leaving an infected cell.
Correct Answer-Viral envelope or membrane, transfer RNA molecules,
proteins, polyamines, cations.
Define capsomere, include in your definition where they are found.
Correct Answer-Discrete component of a capsid. Constructed from
several identical protein molecules.
What phenomenon increases the chances of rabies virus being
transmitted? Correct Answer-Infected mammals become more
aggressive increasing the chances of biting and transmitting the virus in
saliva.
A mosquito's ovaries are infected with West Nile virus; in what way can
she transmit the infection? Correct Answer-Horizontally and vertically.
What is a minimum infective dose and provide two reasons why it is
required? Correct Answer-Minimum amount of virus required for
infection of a host.
Some virions may be defective.
Some may be inactivated by the hosts immune system.
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