Safferman and Morris
Lederberg and Zinder
Smithv and Knight
None of these
B. Lederberg and Zinder
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
D. Iwanowski
F.C. Bawden
W.M. Stanley
K.M.Smith
DNA
RNA
both DNA and RNA
none of these
Replication
Mutation
Production of energy
Growth
Stanley
Iwanowiski
Twort
Herelle
Tobacco mosaic virus
Potato mosaic virus
Cauliflower mosaic virus
Tomato mosaic virus
picornaviruses
binal viruses
riboviruses
none of these
Safferman and Morris
Lederberg and Zinder
Smithv and Knight
None of these
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
virion
vira
viroid
none of these
RNA of the virus
DNA of the virus
RNA of the host
Ribosome of the host
antivirin
antigen
virion
interferon
viruses
bacteria
algae
fungi
poison
secretion
cell
venom
viruses
bacteria
fungi
none of these
balanced
threshold
transitional
none of these
mumps
cholera
typhoid
plague
Early blight of potato
Late blight of potato
Leaf roll of potato
None of these
vaccination against small pox
vaccination against chicken pox
immunization against small pox
immunization against chickcn pox
episome
mesosome
free DNA
T-phage
lesion
lysis
autolysis
haemolysis
double stranded RNA
single stranded DNA
double stranded DNA
single stranded RNA
multiply only in the host cytoplasm
are made up of proteins only
behave as if they were plants
occur only inside bacteria
RNA
DNA
DNA and RNA
none of these
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
prophage
vegephaege
cyanophage
phycophage
can grow inside a living host
can multiply inside a living host
can undergo mutation inside a living host
are non-cellular
bacteriophage
coliphage
phytophage
zoophage
DNA
RNA
DNA and RNA
None of these
are colourless
have enzymes
have nucleic acids
none of these