Viral DNA incorporated in host DNA is known as
prophage
vegephaege
cyanophage
phycophage
Correct Answer :
A. prophage
Related Questions
The virus DNA which is incorporated into bacterial DNA is termed as
episome
mesosome
free DNA
T-phage
A virus contains
an outer protein coat and a central core of DNA or RNA
outer RNA or DNA and a central core of proteins
only nucleic acids
only protein coats
A clear /.one lot uwhI in bacterial < olon due to viral action is railed
plaque
phnge
streak
krnn/
Viruses with two types of symmetry, U. icosahedral head and helical tail are called
picornaviruses
binal viruses
riboviruses
none of these
Roux Sarcoma virus contains
RNA
DNA
DNA and RNA
none of these
Which of the following phenomenon is absent in virus ?
Replication
Mutation
Production of energy
Growth
Most of the antibiotics have no effect on viruses as
they kill all bacteria which form host of viruses
viruses have no metabolism of their own
viruses form endospores
viruses are too small in size
Viruses were discovered by
Stanley
Iwanowiski
Twort
Herelle
A bacteriophage and a yeast cell are similar in that, both
are colourless
have enzymes
have nucleic acids
none of these
Little leaf disease of brinjal is caused by
viruses
bacteria
fungi
none of these
RNA particles causing symptoms like those of viral diseases is known as
virion
vira
viroid
none of these
The disease in man caused by viruses is
mumps
cholera
typhoid
plague
Dahlia mosaic virus contains
DNA
RNA
DNA and RNA
None of these
Edward Jenner discovered
vaccination against small pox
vaccination against chicken pox
immunization against small pox
immunization against chickcn pox
The exception to the cell theory of Schleiden and Schwann are
viruses
bacteria
algae
fungi
Virus was crystallized and isolated first by
D. Iwanowski
F.C. Bawden
W.M. Stanley
K.M.Smith
One of the following discovered synthesis of DNA from RNA in Roux Sarcoma Virus
Smith
Temin
Twort
Mayer
Virus is a.............................. stage between living and non-living.
balanced
threshold
transitional
none of these
Viruses are defined as
a buch of genomes which are looking for a suitable host for replication
micro-organisms which contains DNA only
smallest micro-organisms causing disease
micro-organisms which contains RNA only
Where is the protein for protein coat of virus synthesized ?
RNA of the virus
DNA of the virus
RNA of the host
Ribosome of the host
Rabies is caused by
viruses
slimemoulds
fungi
bacterium
Which of the following is a Capsid ?
Protein part of virus
Nucleic part of virus
Both (a) and (b)
None of these
Which of the following is an example of DNA containing plant virus ?
Tobacco mosaic virus
Potato mosaic virus
Cauliflower mosaic virus
Tomato mosaic virus
An antiviral substance produced by many vertebrates in response to viral In. fection for resisting the multiplication of viruses is known as
antivirin
antigen
virion
interferon
Which of the following is a viral disease of potato ?
Early blight of potato
Late blight of potato
Leaf roll of potato
None of these
Genetic modification brought about by a virus in a bmleria is known as
transformation
transduction
conjugation
candidiasis
Transduction was discovered by
Safferman and Morris
Lederberg and Zinder
Smithv and Knight
None of these
Viruses differ from living organisms in that, they
can grow inside a living host
can multiply inside a living host
can undergo mutation inside a living host
are non-cellular
Viruses are believed to be
living organisms
non-living organisms
a transitional group between living and non-living world
living organisms which have lost the power of multiplication
One of the interesting features of viruses is that they
multiply only in the host cytoplasm
are made up of proteins only
behave as if they were plants
occur only inside bacteria