Viruses from Animal and Plants
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What
does the positive strand in double stranded RNA viruses stands for?
a. tRNA
b. rRNA
c. None
of these
d. mRNA
Which
of the following characteristics would not be used to classify viruses?
a. Symmetry
b. Presence
of an envelope
c. Type
of nucleic acid
d. Type of cell wall structure
Interanuclear
inclusion bodies are found in cells infected with ____________.
a. Herpesviruses
b. Parvoviruses
c. Adenoviruses
d. all of these
What
can be coated to the plastic dish if an ELISA is performed to directly detect
polio virus?
a. Polio
capsid protein
b. Colored
substrate
c. Anti-polio antibody
d. Patient
serum
Influenza
virus undergoes antigenic shift resulting in major antigenic changes by which
of the following mechanisms?
a. Reassortment of RNA segments from
different influenza viruses
b. Expression
of several different capsule types
c. Somatic
recombination of heavy and light chains
d. Changing
the receptor binding canyon that docks with the host receptor
The
nucleocapsid is covered by an outer membrane like structure called
____________.
a. covering
b. envelope
c. membronocapsid
d. all
of these
Animal
viruses with capsids displaying helical symmetry include ____________.
a. influenza
b. measles
and mumps
c. rabies
d. all of these
Icosahedral
viruses are generally ____________.
a. polio
viruses
b. adeno
viruses
c. both (a) and (b)
d. none
of these
Which
type of interferon is produced by virus-infected cells?
a. α
b. β
c. Both (a) and (b)
d. None
of these
Fluorescence
microscopy can be used for the diagnosis of ____________.
a. Rabies
b. Subacute
sclerosing panencephalitis
c. Herpes
simplex encephalitis
d. All of these
Viral
matrix proteins are ____________.
a. anchor the envelope of enveloped viruses
b. part
of the nucleoprotein core of viruses
c. found
mainly on naked viruses
d. exposed
on the surface of the virus
Mumps
vaccine is prepared from the cultures of ____________.
a. African
green monkey cells
b. chick fibroblasts
c. sheep
d. healthy
calves
The
microbes which are most likely to be completely dependent on a plant or animal
host are ____________.
a. bacteria
b. viruses
c. algae
d. fungi
The
two major components of viruses are ____________.
a. fat
and carbohydrate
b. fat
and protein
c. carbohydrate
and nucleic acid
d. nucleic acid and protein
West
Nile virus can cause a disease in human beings that may be transmitted from an
infected bird to a person by a mosquito. This is an example of ____________.
a. nosocomial
infection
b. endogenous
infection
c. fomite
borne disease
d. arthropod borne disease
The
reovirus and influenza virus contain ____________.
a. 5
different segments of dsRNA and 7 different segments of ssRNA respectively
b. 7 different
segments of dsRNA and 5different segments of ssRNA respectively
c. 8
different segments of dsRNA and 10 different segments of ssRNA respectively
d. 10 different segments of dsRNA and 8
different segments of ssRNA respectively
Which
type of interferon is produced by T lymphocytes?
a. α
b. β
c. ?
d. ?
and β
Transfer
of infection from cell to cell occurs mainly by direct transfer of virions via
____________.
a. cytodesmata
b. plasmodesmata
c. protodesmata
d. none
of these
Intracytoplasmic
inclusion bodies are found in cells infected with ____________.
a. Fowlpox
virus
b. Vaccinia
virus
c. Rabies
virus
d. all of these
What
is the function of positive strand in double stranded RNA viruses?
a. Production
of ribosomes
b. Synthesis of protein
c. Both
(a) and (b)
d. None
of these
Negative
strand ssRNA viruses need to have a preformed replicase when they invade a
mammalian cell because they ____________.
a. use
it to terminate transcripts when they copy host cell mRNA
b. use
it to modify host enzymes that are recruited for viral replication
c. have to make a positive strand copy that
can be translated
d. none
of the above
The
tissue structure deteriorates as the virus multiplies. This deterioration is
called ____________.
a. protopathic
effect
b. cytopathic effect
c. aneuploidy
d. none
of these
The
RNA sarcoma viruses, the most strongly transforming viruses may transform which
of the following cells in a culture?
a. iris
epithelial
b. myoblasts
c. fibroblasts
d. all of these
Plant
viruses penetrate host cells through transient ores called ____________.
a. protodesmata
b. cytodesmata
c. endodesmata
d. ectodesmata
Which
of the following reflects the correct order of events that take place during
the multiplication of a virus?
a. Attachment,
release, biosynthesis, maturation, penetration
b. Attachment,
penetration, maturation, biosynthesis, release
c. Attachment, penetration, biosynthesis,
maturation, release
d. Penetration,
attachment, biosynthesis, maturation, release
The
transcription of the viral nucleic acid into mRNA is not necessary in case of
____________.
a. ds
DNA viruses
b. RNA viruses
c. ss
DNA viruses
d. all
of these
Which
of the following virus is transmitted by the respiratory route?
a. Measles
virus
b. Coronavirus
c. Rhinovirus
d. All of these
The
structural abnormality of cells is termed as ____________.
a. metastasis
b. hyperplasia
c. anaplasia
d. all
of these
The
penetration of animal viruses into attached cells occur by mechanisms
consisting of engulfment of whole virions by the cells in a phagocytic process
called ____________.
a. vivopexis
b. vitropexis
c. ectodesmata
d. viropexis
Viropexis
takes place in the phagocytic vacuoles and is due to the action of enzymes
____________.
a. lysosomal protease
b. DNA
gyrase
c. lysosomal
lipase
d. all
of these
Negri
bodies are found in cells infected with ____________.
a. Rabies virus
b. Vaccinia
virus
c. Paramyxoviruses
d. Fowlpox
virus
The
uncontrolled proliferation of cells is termed as ____________.
a. anaplasia
b. metastasis
c. hyperplasia
d. all
of these
Which
of the following virus is transmitted by genital route?
a. Hepatitis
B virus
b. Herpes
simplex virus type 2
c. Papillomaviruses
d. All of these
The
predominant lipid substance found in the viral envelope is ____________.
a. neutral
fat
b. glycolipids
c. phospholipids
d. all
of these
Supercoiling
refers to the extra turns in the structure of ds DNA due to the action of
____________.
a. RNA
pyrase
b. DNA
pyrase
c. DNA gyrase
d. RNA
gyrase