WorksheetsIT2 - Exam 4 JARVI
Total questions: 88
Worksheet time: 50mins
Why are most emerging infectious disease that infect humans due to viruses?
Bacteria easier to treat than viruses
Viruses easier to treat than bacteria
Bacteria more variable
Viruses are more variable
Why are most emerging infectious disease that infect humans due to viruses?
Viruses are zoonoses: larger reservoir, less likely to be eliminated
Baceria are vector transmitted
Bacteria are zoonoses: larger reservoir, less likely to be eliminated
Viruses are vector transmitted
Which of these describes the structure of a virus?
Obligate intracellular
Replicate only inside living cells
Aerobic intracellular
Contain nucleic acids, spikes, capsid and envelope
Come in different shapes and sizes
Select the components of a virus:
Nucleic acids
Spikes
Capsid
Envelope
Endoplasmic reticulum
Which structure may or may not be present and is attached to specific receptors such as (glycoproteins)?
Nucleic acids
Spikes
Capsid
Envelope
Endoplasmic reticulum
Which structure protects, determines shape and attachment to host cells?
Nucleic acids
Spikes
Capsid
Envelope
Endoplasmic reticulum
Which structure is acquired as a "bud" or move through membranes of host, help hide (increase infection by fusing with host membrane)?
Nucleic acids
Spikes
Capsid
Envelope
Endoplasmic reticulum
What are the two shapes a virus can come in?
Helical
Polyhedral
Cylinder
Spherical
Oblong
What word describes a viral host range?
What hosts the virus can infect
What types of pathogens are viruses
Pathogens that can infect humans and animals
Viruses that are resistant to antivirals
Poliovirus is known to infect?
Humans in nature
Humans in labs
Monkeys in labs
Monkeys in nature
Rabies (CNS) in warm blooded animals
What word describes viral specificity?
What hosts the virus can infect
What types of pathogens are viruses
Pathogens that can infect humans and animals
Viruses that are resistant to antivirals
Depends on receptors, availability of host enzymes to replicate, if able to be released from cell
Where can papillomavirus appear?
Skin as warts
Arms as rash
Genital areas as hives
Mouth as white spots
How does cytomegalovirus appear?
Skin as warts
Arms as rash
Genital areas as hives
Mouth as white spots
Salivary glands, GI tract, liver, lungs and can cross placenta to attach to CNS of fetus
What system is used to name and classify viruses?
Baltimore Classification
Maryland Classification
Neuman Classification
Dewey Decimal Classification
North American Industry Classification System
How many classes are in the Baltimore Classification system?
1
2
3
7
6
How are viruses classified?
Chemical/physical properties
Mode of replication
Shape
Host range
Person who discovered virus
The name Picornaviridae was based on:
Small, RNA
Backward
Toga or Clock
Respiratory Enteric Orphans
Crown
The name Retroviridae was based on:
Small, RNA
Backward
Toga or Clock
Respiratory Enteric Orphans
Crown
The name Parvoviridae was based on:
Small
Backward
Toga or Clock
Respiratory Enteric Orphans
Crown
The name Togaviridae was based on:
Small
Backward
Toga or Clock
Respiratory Enteric Orphans
Crown
The name Reoviridae was based on:
Small
Backward
Toga or Clock
Respiratory Enteric Orphans
Crown
The name Coronaviridae was based on:
Small
Backward
Toga or Clock
Respiratory Enteric Orphans
Crown
Which of these describes DNA?
Double stranded
Single stranded
Replicate in the nucleus of a cell
Transcribe and replicate in the cytoplasm of a cell
Which of these describes RNA?
Double stranded
Single stranded
Replicate in the nucleus of a cell
Transcribe and replicate in the cytoplasm of a cell
Which of these describes DNA?
Double stranded
Single stranded
Replicate in the nucleus of a cell
Transcribe and replicate in the cytoplasm of a cell
Must first transcribe DNA to RNA then synthesize proteins
Which of these describes RNA?
Double stranded
Single stranded
Replicate in the nucleus of a cell
Transcribe and replicate in the cytoplasm of a cell
Can bypass the stage when DNA transcribes into RNA
What are the major RNA viruses that cause human disease?
Coronaviridae
SARS and SARS-CoV-2
MERS
Single strand (+) positive sense
RNA genome
A (+) sense is:
Similar to mRNA
Can go right into a cell and synthesize proteins
Dose not reply on polymerase or reverse transcriptase
Needs its own polymerase
Requires an extra step in order to produce proteins
A (-) sense is:
Similar to mRNA
Can go right into a cell and synthesize proteins
Dose not reply on polymerase or reverse transcriptase
Needs its own polymerase
Requires an extra step in order to produce proteins
What is the first step in replication to produce more virions?
Adsorption
Penetration
Synthesis
Maturation
Release
What is the 2nd step in replication to produce more virions?
Adsorption
Penetration
Synthesis
Maturation
Release
What is the 3rd step in replication to produce more virions?
Adsorption
Penetration
Synthesis
Maturation
Release
What is the 4th step in replication to produce more virions?
Adsorption
Penetration
Synthesis
Maturation
Release
What is the 5th step in replication to produce more virions?
Adsorption
Penetration
Synthesis
Maturation
Release
How many steps are in the replication process to produce more virions?
4
5
6
7
8
What step pertains to the attachment, cell walls, pili or flagella?
Adsorption
Penetration
Synthesis
Maturation
Release
What step pertains to the lysozyme in tail, phage penetrates bacterial cell wall and cell membrane. Phage DNA is injected?
Adsorption
Penetration
Synthesis
Maturation
Release
What step pertains phage DNA to mRNA using host machinery to produce copies of phage DNA?
Adsorption
Penetration
Synthesis
Maturation
Release
What step pertains assembly of head packed with DNA?
Adsorption
Penetration
Synthesis
Maturation
Release
What step pertains lysozyme burst time 20-40 mins, 50-200 new phages?
Adsorption
Penetration
Synthesis
Maturation
Release
True or false: DNA viruses all replicate in the nucleus except for pox viruses which replicate in the cytoplasm.
True
False
What are the steps in animal virus replication?
Adsorption
Penetration
Synthesis
Maturation
Release
Where does pox virus replicate?
Nucleus
Cytoplasm
ER
Capsid
Envelope
Explain the utility of bacteriophage therapy
Highly specific, leave good bacteria behind
Cheap
Rarely causes side effects
Tablet/aerosol spray
Western medicine turned away from phage therapy
What is a bacteriophage?
Virus that invade bacterial cells
Disrupt bacterial metabolism
Cause bacterium to lyse
Can be used to treat pathogenic bacterial infections
True or false: It is harder to develop new phage than new antibiotic.
True
False
When any human becomes infected with a virus the interferon makes:
Type 1 IFN
Type 2 IFN
MHC class 1
CD8 cells
FAs
What does Type 1 IFN do?
Interfere with viral replication
Signals neighboring cells that a virus is present
Make virus infected cells more vulnerable to attack by lymphocytes
Control virus replicatoin
Terminate infection or contain it until CD8+ CTL response
Which are a part of the Innate Response system?
Interferon
NK cells
CTL
____ is an early component of host response o virus infection, help control virus replication, kill infected cells and secrete cytokine, can either terminate infection or contain it until CD8+ CTL response
NK cells
Interferon
CD8 cells
MHC Class 1
Type 1 IFN
Which immune response is responsible for antigen processing and presentation by MHC Class 1 molecules and CTL killing?
Innate
Adaptive
When IFN's bind to ____ IFN receptor stimulate ____ cell into action to kill virally infected cells.
NK cells
CD4 cells
MHC Class 1
CTL
____ are CD8+ cytotoxic cells that kill cells infected with viruses.
CTL
MHC Class 1
RBC
FAS
CTL secrete ______ which trigger apoptosis.
Granzymes
Lysozyme
Enzyme
Proteases
______ and ______ make holes in the membrane to help deliver granzymes into a cell.
Perforins
Granulysin
Lysozyme
Enzyme
Viral peptide
CTL express ____ ligand on membrane which binds ____ on target cell which triggers apoptosis?
Fas
CTL
MHC
Type 1 IFN
True or false: Viruses take over cellular machinery to make their proteins in the cytosol. Proteasomes in the cytosol are modified upon infection to degrade and process viral peptides so that they bind MHC 1.
True
False
CTL's are CD8+ cytotoxic T cells that kill cells infected with viruses. CTLs are activated by a viral peptide being presenting in the ____ of an ____ molecule on surface of APC.
Cleft
MHC Class 1
MHC class 2
Type 1 IFN
Cytotoxic
Which action does this describe? Aids in delivering contents of granules into the cytoplasm of target cell.
Perforin
Granzymes
Granulysin
Which action does this describe? Serine proteases, which activate apoptosis once in the cytoplasm of the cell target.
Perforin
Granzymes
Granulysin
Which action does this describe? Has antimicrobial actions and can induce apoptosis.
Perforin
Granzymes
Granulysin
What are the mechanisms that viruses use to evade and subvert the host immune system?
Antigenic drift
Antigenic shift
Genomic shift
Genomic drift
Host evasion
Which causes a point mutation in the genes that encode hemagglutinin and neuraminidase, changes 2-3 years and is usually mild epidemics?
Antigenic drift
Antigenic shift
Which causes major influenza pandemics, big changes, genetic reassortment when two viruses (usually from different animal hosts ie.birds and humans) infect the SAME cell.
Antigenic drift
Antigenic shift
Which virus can be latent which means the virus is not being replicated. It does NOT cause disease but it CANNOT be eliminated since there are no viral peptides being made to flag its presence.
Herpes
SARS
Covid
HIV
AIDS
_______ a state or period of inactivity or dormancy.
Latent
Quiescent
_______ when virus is not being replicated, dos not cause disease but cannot be eliminated due to lack of viral proteins being made to flag its presence.
Latent
Quiescent
What causes chicken pox, but remains in dorsal root ganglia. When reactivated causes Shingles?
Herpes zoster (varicella zoster)
Epstein Barr
SARS
HIV
What can latent memory B cells lead to?
Burkitt's lymphoma
Chicken pox
AIDS
Hep B
Meningitis
Development and function of NK cells and CD8+ T cells are dependent on ______ molecules.
MHC Class 1
IFN
CPE
CTL
_____ effects of a virus on cell in vitro can sometimes determine which virus is present by cells' reaction.
Cytopathic
Erythemic
Transversal
Teratogenic
The earlier in pregnancy infected the greater the damage. This describes which type of effect?
Cytopathic
Erythemic
Transversal
Teratogenic
How are viruses detected?
Serology
Epidemiology
Biology
Microscopology
What can the TORCH test detect?
Toxoplasma
Other disease causing viruses - Hep B, chicken pox
Rubella - german measles
Cytomegalovirus neurological 1% at bitch
HSV herpes simplex virus, acquired at or shortly after birth
Which test is a serial dilution of virus?
Quantitative hemagglutination
Hemagglutination inhibition
ELISA
PCR and rRT-PCR
Which test is a serial dilution of antiserum where you add standard amount of virus, let bind and add standard RBC to detect virus unbound to antibody.
Quantitative hemagglutination
Hemagglutination inhibition
ELISA
PCR and rRT-PCR
Which test is an enzyme linked immunosorbent assay?
Quantitative hemagglutination
Hemagglutination inhibition
ELISA
PCR and rRT-PCR
Which test is an enzyme linked immunosorbent assay?
Quantitative hemagglutination
Hemagglutination inhibition
ELISA
PCR and rRT-PCR
Which test the test where you don't have to culture the virus to detect it, need to know the nucleotide sequence of viral genes and where you can amplify genes from non-cultivable viruses for vaccine production. These cloned genes can then be injected into an animal and express protein = dna vaccine?
Quantitative hemagglutination
Hemagglutination inhibition
ELISA
PCR and rRT-PCR
What are some examples and characteristics that cause cancer?
Cells that divide repeatedly causing neoplasm and tumor
Tissue metastasize
Epstein Barr virus - infecting B cells
What is the most common mosquito-borne viral disease in the world?
Dengue
Zika
Coronavirus
SARS
What is the specific treatment for dengue/severe dengue?
No treatment
Bactrim
Sulfamethoazole
Acetaminophen
What are some symptoms of dengue fever?
Sudden onset of fever
Severe headache
Eye pain
Joint paint
Rash
True or false: you can give the dengue vaccine to those with NO prior infection.
False
True
True or false: The Dengue vaccine developed by Sanofi Pasteur is a 3-dose series, 0/6/12 month schedule vaccination
True
False
_____ protein allows virus to attach to human cells during infection.
Spike
CHD
B cells
Terogenic
How many serotypes exist for Dengue fever?
1
2
3
4
5
True or false: Serotypes of Dengue fever are cross-protective.
False
True
