Virus Flashcards
Largest DNA virus a. Parvovirus
b. Adenovirus
c. Herpesvirus
d. Poxvirus
D
Viral infectivity is generally destroyed by heating at
a. 50-60 degree Celsius for 30 mins
b. 50-60 degree Celsius for 30-60 mins
c. 37 degree Celsius for several hours
d. 37 degree Celsius for 30 mins
A
The following are true of viruses except
a. Some viruses are potential bioterrorism agents based on ease of host-to-host transmission and
mortality rates
b. All infections lead to newly progeny virus
c. Known viruses are highly diverse, varying in size, shape and genetic content, some types possess a lipid envelope.
d. Viruses are the smallest infectious agents and contain only one type of nucleic acid (DNA or RNA)
B
Virus-infected cells often develop morphologic changes referred to as cytopathic effects. Which of the following statements about virus induced cytopathic changes is most accurate?
a. They are rarely associated with cell death
b. They can only be seen with an electron microscope
c. They are pathognomonic for an infecting virus
d. They may include giant cell formation
D
Some viruses are characterized by helical symmetry of the viral nucleocapsid. Which of the following statements about viruses with helical symmetry is most accurate?
a. Excess empty helical particles containing no nuclei acid are commonly produced in infected cells
b. All enveloped viruses with helical symmetry are classified into the same virus family
c. All human viruses with helical nucleocapsids possess an envelope
d. Helical nucleocapsids are found primarily in DNA-containing viruses
C
Icosahedral enveloped RNA virus
a. Togavirus
b. Flavivirus
c. Coronavirus d. Bunyavirus
A
The mode of transmission of this virus is thru direct contact through the mouth
a. Hepatitis B
b. Rubella virus
c. Mumps virus
d. Cytomegalovirus
D
Smallest RNA virus a. Picornavirus
b. Filovirus
c. Coronavirus
d. Calicivirus
D
The following are used as a basis for the classification of viruses except
a. Virion morphology, including size, type of symmetry, presence or absence of peplomers, and
presence or absence of membranes
b. Antigenic properties, particularly reactions to various antigens
c. Virus genome properties including type of nucleic acid (DNA or RNA), size of the genome, strandedness (single or double), whether linear or circular, sense (positive, negative, ambiense) segments (number, size), nucleotide sequence, percent GC content and presence of special features (repetitive elements, isomerization)
d. Biologic properties, including natural host range, mode of transmission, vector relationships, pathogenicity, tissue tropisms, and pathology.
B
Described as very long and threadlike and causes severe hemorrhagic fever in Africa
a. Filoviridae
b. Paramyxoviridae c. Orthomyxoviridae d. Reoviridae
A
following are naked icosahedral nucleocapsid RNA virus except a. Picornavirus
b. Flavivirus
c. Reovirus
d. Calicivirus
B
Viruses belonging to which of the following groups are likely to establish latent infections
a. Influenza viruses
b. Poxviridae
c. Herpesviruses
d. Filoviruses
C
DNA virus which is icosahedral capsid and is sensitive to Ether sensitivity a. Adenovirus
b. Hepadnavirus
c. Parvovirus
d. Herpesvirus
B
The following are DNA viruses except a. Adenovirus
b. Poxvirus
c. Picornavirus
d. Hepadnavirus
C
Which of the following virus described as double stranded RNA virus? a. Flaviviridae
b. Togaviridae
c. Caliciviridae
d. Picornaviridae
D
Which RNA virus helical, capsid, enveloped virion and is sensitive to Ether sensitivity? a. Paramyxoviridae
b. Orthomyxoviridae
c. Reoviridae
d. Picornaviridae
B
he following describes nucleocapsid
a. The protein-nucleic acid complex representing the packaged form of the viral genome
b. Are usually a collection of more than one nonidentical protein subunit
c. Morphologic units seen in the electron microscope on the surface of icosahedral virus particles
d. The protein shell, or coat that encloses the nucleic acid genome
A
The only enveloped DNA virus a. Parvovirus
b. Adenovirus
c. Herpesvirus
d. Hepadnavirus
D
his viruses are usually stable between pH values of 5.0 and 9.0
a. Cardioviridae
b. Hepatitis virus
c. Adenovirus
d. Enteroviridae
D
Which of the following RNA virus is resistant to Ether sensitivity? a. Orthomyxoviridae
b. Paramyxoviridae
c. Picornaviridae
d. Reoviridae
C
All of the following are cardinal signs of measles, except
a. Diarrhea
b. Conjunctivitis c. Coryza
d. Cough
A
At what temperature should clinical specimens suspected of containing viruses kept for transport that takes days?
a. -1 C b. 40C c. -70C d. 37C e. 24C f. 0 C
F
The most common viral syndrome of pericarditis, myocarditis, and pleurodynia is caused by
a. Epstein Barr virus
b. Coxsackie B virus
c. Herpes simplex virus
d. Respiratory syncytial virus
B