Font size
WorksheetsVirology Final Exam Review
Total questions: 83
Worksheet time: 45mins
Which of the following statements are true of all viruses?
They all have a protein capsid that encases their genetic material
All of the answers are correct
They are all enveloped
They all possess the same type of nucleic acid
For which virus was the first deliberately attenuated viral vaccine developed?
Rabies virus
Smallpox virus
Herpes virus
Vaccina virus
Influenza virus was discovered before the first oncogenic virus was discovered
True
False
Prolate is a viral shape variant found in
Mammalian viruses
Plant viruses
Human viruses
Bacteriophages
The ability of viruses to grow and replicate outside of their host cells is a characteristic that makes them highly infectious and is important for transmission.
True
False
A virus that is integrated into the host genome is called a ________
Provirus
Super infection
silent virus
integron
Which DNA genome, upon entry into the cell, can be immediately copied into mRNA?
Gapped dsDNA
Linear ssDNA
dsDNA
all types of DNA can be immediately copied to mRNA
There are some viruses that only encode 1 viral protein.
True
False
Which of the following are a known viral genome structure? Check all that apply
Segmented
Circular
Duplicitous
Ambisense
A resistant cell has a viral receptor but will not support viral replication.
True
False
Which statement about viral RNA genomes is correct?
dsRNA genomes can be directly translated to make viral protein
Copying of (+)ssRNA during virus replication does not require a (–) strand intermediate
(+)ssRNA genomes may be translated to make viral protein
RNA genomes can be copied by host cell RdRp
Only a few enveloped viruses have viral proteins protruding from the envelope.
True
False
The lowering of internal pH is a major difference between endosomes and caveosomes.
True
False
Which of the following must occur in order for viral envelopes to fuse with cellular membrane during entry? Check all that apply.
The fusion protein must undergo a conformational change
The virus must bind it's host cellular receptor
The viral and cellular membranes must be pulled together
The cellular membrane must ruffle.
Both carbohydrate and protein receptors on host cells can be used by viruses as attachment receptors.
Correct!
True
False
Once in the lysogenic cycle, bacteriophage can never switch back to the lytic cycle.
True
False
The initial adherence of viruses to host cells are guided by electrostatic forces and are extremely specific.
True
False
For ss (+) RNA viruses, which protein is responsible for copying the genome?
The RNA-dependent RNA polymerase (RdRp)
The ribosome
DNA-dependent DNA polymerase
The Reverse Transcriptase
Which of the following contribute to antibody dependent enhancement of Dengue infections? Check all that apply.
An increased number of infected cells
Suppression of the antiviral immune response
Increased virus production
Being infected multiple times with the exact same strain of Dengue
Which of the following are characteristic of the persistent phase of norovirus infection?
Lasts up to 2 months
asymptomatic infection
high viral titers in the stool
Which of the following statements is TRUE.
flaviviruses generate individual mRNAs for translation
cellular enzymes are responsible for cleaving the polyproteins of Flaviviruses
viral enzymes are responsible for cleaving the polyproteins of Flaviviruses
The term for the one long protein that results from the translation of the picornavirus genome is...
none of the answer choices are correct
a pre-cleaved protein
a polyprotein
a poly-cistronic message
Of the emergent Coronaviruses, which one is primarily transmitted by camels?
SARS-CoV-1
SARS-CoV-2
MERS
Which of the following characteristics of Measles do NOT contribute to the highly contagious nature of the virus?
Measles can survive up to 2 hrs in the air and on surfaces
Measles infects both epithelial and immune cells
Measles is spread through airborne transmission
Of the choices below, how does translation of VSV differ from translation of Poliovirus?
VSV uses viral enzymes to cleave its polyprotein, which poliovirus uses cellular enzymes
Translation of proteins for VSV and Poliovirus are not different.
Translation for VSV occurs in the cytoplasm, while translation for Poliovirus occurs in the nucleus.
VSV translates each protein sequence individually while Poliovirus translates one long polyprotein that is ultimately cleaved by viral proteases.
What molecule on the host cell does Influenza virus bind to?
gp120
CD4
vp40
sialic acid
Which characteristic of Measles infection is linked to development of immune amnesia?
destruction of memory immune cells
ability to spread to the brain
enhanced infection resulting from vaccination
use of hemagglutinin as an attachment receptor
Which ss(-) RNA virus has a 100% mortality rate?
Ebola Virus
Influenza virus
Mumps virus
Rabies virus
Which of the following is a unique characteristic of Influenza replication in comparison to other RNA viruses?
Influenza RNA remains in the cytoplasm for transcription.
Influenza is taken up by endocytosis.
Influenza RNA goes into the nucleus for transcription
Influenza mRNAs can't be directly copied to make full length genome.
Which of the following are unique characteristics of Reovirus replication compared to the replication of other RNA viruses?
The virus enters through receptor mediated endocytosis
The mRNA serves a the template for genome production
The virus remains in the endosome until it has fused with the lysosome
Which of the following is a unique characteristic of Reoviruseses compared to other RNA viruses discussed in this course?
They have a segmented genome
They have two concentric shells
They replicate in the cytoplasm
They package their RdRp
Which Bluetongue virus proteins form a complex found at regular intervals along the inside of the viral core?
VP4, VP3 and VP7
VP3, VP7 and VP5
VP2, VP5, and VP7
VP1, VP4 and VP6
One day you find yourself sick with both diarrhea and vomiting. Since you've taken Virology, you know that you are likely infected with either Norovirus or Rotavirus. Which aspect of your illness or symptoms would give a good indication of which virus you were infected with?
Rotavirus is a pediatric disease, so I most likely have a Norovirus infection
It's impossible to make an educated guess about which virus I have based on symptoms or pattern of infection.
Rotovirus does not induce vomiting, so it must be Norovirus.
Children are immunized with vaccines against Norovirus, so I must be infected with Rotavirus.
Which Bluetongue virus protein it primarily involved in cellular attachment?
Correct!
VP2
VP6
VP5
VP4
Why must dsRNA viruses package an RNA-dependent RNA polymerase (RdRp) inside their viral capsid?
Because all RNA viruses package an RdRp.
Because the (+) of RNA in their genome cannot function as mRNA
Because the RdRp converts the RNA to DNA so it can be translated by host ribosomes.
dsRNA viruses don't actually package an RdRp
Which of the following is a distinct step in the reverse transcription of retroviral RNA? Check all that apply.
nicking of the template RNA
Initiation of (+) DNA synthesis
Initiation of synthesis of new template RNAs
template exchange
What is the most common mode of transmission for HIV?
IV drug use
Blood Transfusions
Sexual contact or intercourse
Transfer from mother to child
In which way is the retrovirus HIV, unlike other single stranded (+) RNA viruses
Retroviruses are smaller than all other ss(+) RNA viruses
Retroviruses are enveloped while other ss(+) RNA viruses are not
Retrovirus RNA gets transcribed in the cytoplasm
Retroviruses encode an RNA transcriptase (RT) to convert their RNA to DNA
Which activity of the polymerase is responsible for degrading the pre-genomic RNA during Hepatitis B DNA replication?
Priming activity
the pre-genomic RNA does not get degraded
Replication activity
RNase H activity
Which of the following are signs of viral hepatitis? Check all that apply.
Increase levels of transaminases in the blood
diarrhea
jaundice
atypical lymphocytes
Which HIV protein is used to bind to the CD4 receptor?
Heparin sulfate
Hemaglutinin
CCR5
gp120
AAV uses sialic acid as its cellular receptor.
True
False
Inverted terminal repeats form which important structures of linear ssDNA molecules?
Hairpin structures
Priming site to allow for DNA polymerase binding
Cleavage site to initiate genome replicaiton
Inverted terminal repeats are not a feature of ssDNA genomes
During rolling circle replication cellular enzymes will repeatedly sit down on the newly synthesized strand of DNA to make the second strand of the dsDNA genome. This process is termed.....
discontinuous DNA synthesis
continuous DNA synthesis
asynchronous DNA synthesis
halting DNA synthesis
All herpes virus tegument proteins remain in the cytoplasm after uncoating of the virus.
True
False
Why are parvovirus infections in animals commonly lethal?
Because the viruses infect vital organs.
None of the answer choices are correct.
Because animals have weak immune responses.
Because infections result in dehydration which can lead to death.
The coordinated regulation of herpes virus infection is controlled by host proteins in response to the production of VP16.
True
False
In general, HSV 2 tends to infect and cause symptoms below the waist.
Correct!
True
False
The primary infection of oral herpes often results in disease symptoms that are more severe than the symptoms of recurrent infections.
Correct!
True
False
Shingles is an example of which type of infection?
Slow infection
Reactivated latent infection
Acute Infection
Chronic infection
Which of the choices best describes the course of a chronic infection?
High virus levels during the initial infection followed by low or undetectable levels of virus with occasional periods of reactivation when virus levels mimic the initial acute infection.
Rapid increase in virus concentrations after infection that remain high throughout the life of the host.
Initial infection results in low levels of virus concentration which increase gradually overtime and peak towards the end of life of the host.
Initial infection characterized by high levels of detectable virus after which the virus is completely cleared from the host.
Herpes simplex virus can only be spread by symptomatic patients.
True
False
During chicken pox infection, skin lesions result from the primary viremia.
True
False
A cancer's spread is called
metastasis
carcinogenesis
oncogenesis
malignancy
A(n) _______ is a type of cancer-causing gene that promotes cancer by activating cell division at an inappropriate time or place
apoptotic
proto-oncogene
DNA repair gene
tumor suppressor gene
All types of HPV are equally capable of resulting in cancer formation.
True
False
Which of the following stimulates cell cycle events?
beta amyloid
tumor suppressor protein
a growth factor
BRCA 1/2
Infection by certain viruses can lead to cancer but don't directly cause cancer.
True
False
Which of the following are a human oncogenic virus? Check all that apply.
Poliovirus
Epstein-Barr Virus
Zika virus
Hepatitis B virus
Which of the following are disadvantages to retroviruses as gene therapy vectors? Check all that apply.
High infection efficiency
Low inflammatory response
Low capsid stability
Integration can lead to transformation
Of the viruses used in gene therapy discussed in the lecture, which can be easily grown in cell culture?
Retroviruses
Adenoviruses
AAV
Which of the following characteristics of gene therapy viruses, allows scientists to overcome the issue of immune responses developed against a virus?
Availability of multiple serotypes.
Genome capacity
Pathogenicity
Immunogenicity
What property of cells, particularly stem cells, makes cell based delivery possible for viral vectors?
they can grow in cell culture
their specific cell receptors
their homing properties
Which of the following viruses are used as vectors for gene therapy treatments? Check all that apply.
Retroviruses
Reoviruses
Adenoviruses
Noroviruses
Adeno-associated virus (AAV) is being explored as a vector for gene therapy in part because of it's large genome capacity.
True
False
Which Hepatitis C genotype had the lowest response rate to interferon and Ribovirin?
Genotype 2
Genotype 3
Genotype 1
Genotype 4
Waning of herd immunity has resulted in a resurgence of which of the following viruses?
Polio
Measles
Rabies
Smallpox
Why are adjuvants sometimes added to vaccines?
None of the answer choices are correct.
To help enhance the immune response against the antigen found in the vaccine
To specifically activate the protective arm of the immune response.
To serve as a preservative and make the vaccines more stable.
The T cell arm of protective immunity is the easiest for viral vaccines to activate.
True
False
Which of the following viral functions (i.e. steps of viral infection) can be targeted by HIV antiviral drugs? Check all that apply.
Attachment
mRNA synthesis
DNA/RNA replication
Penetration and uncoating
Assembly
Which of the following Influenza components are targeted by anti-viral drugs? Check all that apply.
M2 ion channels
sialic acid
hemmaglutanin
neuraminidase
To date, there have been no associations between the virome and human disease.
True
False
Eukaryotic viruses are the first viruses to establish the human virome.
True
False
16s rRNA sequencing can be used to:
study the biodiversity of bacterial in a complex environmental sample
determine the evolutionary relationships among community members of a virome
determine the function of members of a microbial ecosystem
Which of the following has the greatest impact on the microbiome?
You Answered
medication
diet
genetics
geography
Which of the following are a mode of infection for bacteriophage?
latent
persistent
lysogenic
acute
One of the most straightforward aspects of studying the virome is separating viruses from other microbes in the sample.
True
False
Chronic or latent viral infection is linked to which of the following disorders. Check all that apply.
Correct!
Alzheimer's Disease
Inflammatory Bowel Disease
Type I Diabetes
Type II Diabetes
Intestinal bacteria can control infection for which of the following viruses?
Measles Virus
SARS-CoV-2 virus
Rotavirus
Influenza virus
Which Herpesvirus is thought to induce Alzheimer's Disease because it reduces expression of amyloid-beta peptide degrading enzymes?
Varicella Zoster Virus
Herpes Simplex Virus
Cytomegalovirus
Human Herpes Virus 5
Commensal bacteria alter norovirus infection by ____________.
regulating Type III IFN responses
controlling antibody production
enhancing attachment to the host cell receptor
Aggregation of which of the following proteins causes Parkinson's Disease?
alpha-synuclein protein
hyperphosphorylated tau protein
amyloid-beta peptide
Herpes Simplex Virus Glycoprotein B
Chronic infection with which of the following RNA viruses is linked to development of Alzheimer's disease?
Hepatitis C
SARS-CoV-2
Influenza
