Q.1
Chloramphenicol/ chloromycetin is produced by … .. [ AIIMS 2001]
  • a) Streptomyces rimosus
  • b) Streptomyces venezuelae
  • c) Streptomyces griseus
  • d) Streptomyces scoleus
Q.2
Gram (+) and Gram (-) forms of bacteria are differentiable through staining with … [ CET Chd1997]
  • a) Safranin + Gentian Violet
  • b) Safranin + Iodine
  • c) Acetocarmine + Iodine
  • d) Crystal Violet + Iodine
Q.3
In Whittaker’s classification, non-nucleated unicellular organisms/ prokaryotes are included under … .. [ BHU 1997]
  • a) Plantae
  • b) Monera
  • c) Protista
  • d) Animalia
Q.4
Phages which show lysogenic cycle are known as … .. [ JIPMER 1997]
  • a) Lytic phages
  • b) Temperate phages
  • c) Virulent phages
  • d) Avirulent phages
Q.5
Black death is … … [ MPPMT 1995]
  • a) Cancer
  • b) Plague
  • c) AIDS
  • d) Gonorrhoea
Q.6
In which bacterial reproduction phage is required …. [ CET Chd. 2000]
  • a) Conjugation
  • b) Transformation
  • c) Binary fission
  • d) Transduction
Q.7
Staphylococcus has … … [ MPPMT 1998 ]
  • a) Cubical colony
  • b) Bunch-like irregular colony
  • c) Chain like colony
  • d) Plate like colony
Q.8
Procaryotes possess … [ JKCMEE 1999]
  • a) Nucleus
  • b) Nucleoid
  • c) Nucleolus
  • d) Nucellus
Q.9
Leprosy is caused by … . [ Bih PMT 1995]
  • a) Spirillum
  • b) Mycobacterium
  • c) Pseudomonas
  • d) Bibrio
Q.10
Modern system of classification divided organisms into Kingdoms … .. [ Har PMT 2005]
  • a) 1
  • b) 2
  • c) 4
  • d) 5
Q.11
Thermococcus, Methanococcus and Methanobacterium exemplify … [ CBSE 2008]
  • a) Bacteria whose DNA is relaxed or positively supercoiled but which has a cytoskeleton as well as mitochondria
  • b) Bacteria that contain a cytoskeleton and ribosome
  • c) Archaebacteria that contain protein homologous to eukaryotic core histones
  • d) Archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled
Q.12
Bacterial plasmids are … [ CBSE 1997]
  • a) Circular dsRNA
  • b) Circular dsDNA
  • c) Linear dsDNA
  • d) Linear dsRNA
Q.13
Heat killed S-cell along with live R-cells of Diplococcus pneumonia where injected in mice .. [ kerala 2002]
  • a) Mice survived and had live S-cells
  • b) Mice survived and had dead R-cells
  • c) Mice died and had dead R-cells
  • d) Mice died and showed live S-cells
Q.14
Two bacteria commonly employed in genetic engineering are … .. [ CBSE 1998]
  • a) Rhizobium and Diplococcus
  • b) Escherichia and Agrobacterium
  • c) Nitrobacter and Azotobacter
  • d) Nitrosomonas and Klebsiella
Q.15
All bacterial cells get stained with … [ MPPMT 1999]
  • a) Mercuric chloride
  • b) Crystal violet
  • c) Crystal violet + iodine
  • d) Safranin
Q.16
One of the useful activities of several bacteria is … [ MPPMT 1998]
  • a) Nitrification
  • b) Biogeochemical cycles
  • c) Nitrogen fixation
  • d) Sulphurification
Q.17
When milk is heated at 62°C for 30 minutes and then cooled, the process is called …… [ CBSE 1996 ]
  • a) Sterilization
  • b) Pasteurisation
  • c) Nitrification
  • d) Freezing
Q.18
Organisms without any specific shape are … [ MPPMT 1997]
  • a) Viruses
  • b) Mycoplasmas
  • c) Bacteria
  • d) Cyanobacteria
Q.19
Chemoautotrophs derive their energy from … .. [ Pb PMT 1998]
  • a) Sun
  • b) Inorganic chemicals
  • c) Dead organisms
  • d) Living organisms
Q.20
Transfer of genetic information through transduction involves … [ CBSE 1998]
  • a) Conjugation
  • b) Bacteriophage released from donor cell
  • c) Another bacterium
  • d) Physical contact between donor and recipient strains
Q.21
Azotobacter and Bacillus polymyxa are … [ CBSE 1996]
  • a) Decomposers
  • b) Non-symbiotic nitrogen fixer
  • c) Symbiotic nitrogen fixer
  • d) Pathogenic bacteria
Q.22
Which do not give out O2 … [ CPMT 2003]
  • a) Green algae
  • b) Blue green algae
  • c) Green plants
  • d) Photosynthetic bacteria
Q.23
Heterocysts present in Nostoc are specialized for … .. [ MPPMT 1990]
  • a) Fragmentation
  • b) Nitrogen fixation
  • c) Storage
  • d) Photosynthesis
Q.24
During conjugation, bacteria attach by means of … .. [ RPMT 1998]
  • a) Flagella
  • b) Pili
  • c) Cilia
  • d) Hair
Q.25
Wine turns sour … .. [ MPPMT 1991 ]
  • a) On exposure to light
  • b) Contamination by aerobic bacteria Acetobacter aceti
  • c) Contamination by anaerobic bacteria
  • d) On heating
Q.26
A filament of Nostoc without its mucilage sheath is called … [ AIIMS 1998]
  • a) Mycelium
  • b) Trichome
  • c) Hypha
  • d) Colony
Q.27
The motile bacteria are able to move by : …[AIPMT 2014]
  • a) cilia
  • b) pili
  • c) fimbriae
  • d) flagella
Q.28
Archaebacteria differ from eubacteria in : ….[AIPMT 2014]
  • a) Cell shape
  • b) Mode of reproduction
  • c) Cell membrane structure
  • d) Mode of nutrition
Q.29
Viruses have : …[AIPMT 2014]
  • a) Single chromosome
  • b) Both DNA and RNA
  • c) DNA enclosed in a protein coat
  • d) Prokaryotic nucleus
Q.30
Which of the following shows coiled RNA strand and capsomeres ? [AIPMT 2014]
  • a) Measles virus
  • b) Retrovirus
  • c) Poliovirus
  • d) Tobacco mosaic virus
Q.31
Which one of the following is not an inclusion body found in prokaryotes? …[AIPMT 2015]
  • a) Polysome
  • b) Phosphate granule
  • c) Cyanophycean granule
  • d) Glycogen granule
Q.32
The active form of Entamoeba histolytica feeds upon: …[AIPMT 2015]
  • a) blood only
  • b) erythrocytes; mucosa and submucosa of colon
  • c) mucosa and submucosa of colon only
  • d) food in intestine
Q.33
Which of the following statements is wrong for viroids? …[AIPMT-2016]
  • a) They lack a protein coat
  • b) They are smaller than viruses
  • c) They cause infections
  • d) Their RNA is of high molecular weight
Q.34
Which of the following is not a feature of the plasmids? …[AIPMT-2016]
  • a) Independent replication
  • b) Circular structure
  • c) Transferable
  • d) Single - stranded
Q.35
Which of the following rRNAs acts as structural RNA as well as ribozyme in bacteria ? …[NEET 2016]
  • a) 23 S rRNA
  • b) 5.8 S rRNA
  • c) 5 S rRNA
  • d) 18 S rRNA
Q.36
Methanogens belong to : …[NEET 2016]
  • a) Dinoflagellates
  • b) Slime molds
  • c) Eubacteria
  • d) Archaebacteria
Q.37
Which of the following are found in extreme saline conditions? ….[NEET- 2017]
  • a) Archaebacteria
  • b) Eubacteria
  • c) Cyanobacteria
  • d) Mycobacteria
Q.38
Which of the following are found in extreme saline conditions? ….[NEET- 2017]
  • a) Archaebacteria
  • b) Eubacteria
  • c) Cyanobacteria
  • d) Mycobacteria
Q.39
Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen? ….[NEET- 2017]
  • a) Bacillus
  • b) Pseudomonas
  • c) Mycoplasma
  • d) Nostoc
Q.40
Viroids differ from viruses in having : ….[NEET- 2017]
  • a) DNA molecules with protein coat
  • b) DNA molecules without protein coat
  • c) RNA molecules with protein coat
  • d) RNA molecules without protein coat
Q.41
Which of the following components provides sticky character to the bacterial cell? ….[NEET- 2017]
  • a) Cell wall
  • b) Nuclear membrane
  • c) Plasma membrane
  • d) Glycocalyx
Q.42
Cell wall is absent in : [ ReAIPMT 2015]
  • a) Nostoc
  • b) Aspergillus
  • c) Funaria
  • d) Mycoplasma
Q.43
Select the wrong statement : [ ReAIPMT 2015]
  • a) Mosaic disease in tobacco and AIDS in human being are caused by viruses
  • b) The viroids were discovered by D.J. Ivanowski
  • c) W.M. Stanley showed that viruses could be crystallized
  • d) The term 'contagium vivum fluidum' was coined by M.W. Beijerinck
Q.44
Engler and Prantl published a phylogenetic system in the monograph … [ kerala 2005]
  • a) Genera Plantarum
  • b) Origin of Species
  • c) Die Naturlichen Pflazenfamilien
  • d) Species Plantarum
Q.45
Bacteria involved in two-step conversion of ammonia into nitrate are … [ CPMT 2004]
  • a) Azotobacter and Nitrosomonas
  • b) Pseudomonas and Nitrobacter
  • c) Azotobacter and Achromobacter
  • d) Nitrosomnas and Nitrobacter
Q.46
Heterocysts, specialized for nitrogen fixation, occur in certain … .. [ BHU 1995]
  • a) Red algae( batrachospermum)
  • b) Green algae ( Spirogyra)
  • c) Blue-green algae (Anabaena)
  • d) Brown algae ( Laminaria)
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