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Which of the following is not the biofertilisers producing bacteria
Nostoc
Clostridium
Both (a) and (b)
Anabaena
Viruses can be purified based on their size and density by using
gradient centrifugation
differential centrifugation
precipitation
NONE OF THESE
Enterobacter can be differentiated from Klebsiella by
NONE OF THESE
Both (a) and (b)
ornithine positivity
motility
Chemotherapeutic agents must
prevent/destroy the activity of a parasite
leave unaltered the host's natural defense mechanisms
be able to come in contact with the parasite by penetrating the cells
All of the above
Phosphate regulation has been observed in the production of
antibiotics
alkaloids
All of These
gibberelins
Microbial rennet, which is used in cheese manufacture is produced by
Aspergillus spp
Mucor spp
Bacillus spp
Saccharomyces spp
Postgates assay technique is useful in determining if a cell is viable even though it is
an obligate aerobe
too small to see
a thermophile
incapable of cell division
If ΔG of a chemical reaction is positive in value and keq is less than 1 then the chemical reaction will
not take place in any of the direction
NONE OF THESE
proceed in reverse direction
proceeed in forward direction
All of the following are sporicidal except
Formaldehyde
ethylene oxide
alcohol
Glutaraldehyde
Lysozyme
(an endolysin) which will lyse the bacterial cell, releasing the mature virions is present in
late genes
All of These
delayed early genes
immediate early phage genes
Viropexis takes place in the phagocytic vacuoles and is due to the action of enzymes
lysosomal lipase
All of These
lysosomal protease
DNA gyrase
The scientist who first discovered the substance penicillin was
Joseph Lister
NONE OF THESE
Alexander Fleming
Paul Ehrlich
Who discovered the bacteria that cause cholera
Pierre Berthelot
Rudolf Virchow
Louis Pasteur
Robert Koch
Which of the following may affect proteins and nucleic acids, but not viruses
denaturation
Pressure
Enzyme treatment
All of These
Which type of plasmid can exist with or without being integrated into the host's chromosome
Episome
Lysogen
Medisome
Lisosome
The envelope of an enveloped virus is derived from
the endoplasmic reticulum of the cell
the cell membrane
NONE OF THESE
the mitochondrion of the cell
What can be coated to the plastic dish if an ELISA is performed to directly detect polio virus
Polio capsid protein
Patient serum
Colored substrate
Anti-polio antibody
Transfer of infection from cell to cell occurs mainly by direct transfer of virions via
cytodesmata
plasmodesmata
protodesmata
NONE OF THESE
Cell counting can be carried out by
direct microscopic count using petroffhansser counting chamber
plate counting
membrane filter count
All of the above
The repressor protein, since the cell is resistant to lysis from externally infecting phage, is also called
NONE OF THESE
immunity operon
immunity repressor
operon repressor
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