Chloramphenicol/ chloromycetin is produced by … .. [ AIIMS 2001]
33%
a) Streptomyces rimosus
40%
b) Streptomyces venezuelae
27%
c) Streptomyces griseus
0%
d) Streptomyces scoleus
Q.2.
Gram (+) and Gram (-) forms of bacteria are differentiable through staining with … [ CET Chd1997]
36%
a) Safranin + Gentian Violet
29%
b) Safranin + Iodine
7%
c) Acetocarmine + Iodine
29%
d) Crystal Violet + Iodine
Q.3.
In Whittaker’s classification, non-nucleated unicellular organisms/ prokaryotes are included under … .. [ BHU 1997]
8%
a) Plantae
33%
b) Monera
33%
c) Protista
25%
d) Animalia
Q.4.
Phages which show lysogenic cycle are known as … .. [ JIPMER 1997]
36%
a) Lytic phages
29%
b) Temperate phages
29%
c) Virulent phages
7%
d) Avirulent phages
Q.5.
Black death is … … [ MPPMT 1995]
30%
a) Cancer
40%
b) Plague
30%
c) AIDS
0%
d) Gonorrhoea
Q.6.
In which bacterial reproduction phage is required …. [ CET Chd. 2000]
38%
a) Conjugation
25%
b) Transformation
38%
c) Binary fission
0%
d) Transduction
Q.7.
Staphylococcus has … … [ MPPMT 1998 ]
29%
a) Cubical colony
29%
b) Bunch-like irregular colony
43%
c) Chain like colony
0%
d) Plate like colony
Q.8.
Procaryotes possess … [ JKCMEE 1999]
14%
a) Nucleus
14%
b) Nucleoid
57%
c) Nucleolus
14%
d) Nucellus
Q.9.
Leprosy is caused by … . [ Bih PMT 1995]
0%
a) Spirillum
29%
b) Mycobacterium
71%
c) Pseudomonas
0%
d) Bibrio
Q.10.
Modern system of classification divided organisms into Kingdoms … .. [ Har PMT 2005]
0%
a) 1
43%
b) 2
14%
c) 4
43%
d) 5
Q.11.
Thermococcus, Methanococcus and Methanobacterium exemplify … [ CBSE 2008]
29%
a) Bacteria whose DNA is relaxed or positively supercoiled but which has a cytoskeleton as well as mitochondria
43%
b) Bacteria that contain a cytoskeleton and ribosome
0%
c) Archaebacteria that contain protein homologous to eukaryotic core histones
29%
d) Archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled
Q.12.
Bacterial plasmids are … [ CBSE 1997]
14%
a) Circular dsRNA
43%
b) Circular dsDNA
29%
c) Linear dsDNA
14%
d) Linear dsRNA
Q.13.
Heat killed S-cell along with live R-cells of Diplococcus pneumonia where injected in mice .. [ kerala 2002]
20%
a) Mice survived and had live S-cells
20%
b) Mice survived and had dead R-cells
20%
c) Mice died and had dead R-cells
40%
d) Mice died and showed live S-cells
Q.14.
Two bacteria commonly employed in genetic engineering are … .. [ CBSE 1998]
17%
a) Rhizobium and Diplococcus
33%
b) Escherichia and Agrobacterium
50%
c) Nitrobacter and Azotobacter
0%
d) Nitrosomonas and Klebsiella
Q.15.
All bacterial cells get stained with … [ MPPMT 1999]
0%
a) Mercuric chloride
0%
b) Crystal violet
60%
c) Crystal violet + iodine
40%
d) Safranin
Q.16.
One of the useful activities of several bacteria is … [ MPPMT 1998]
0%
a) Nitrification
0%
b) Biogeochemical cycles
100%
c) Nitrogen fixation
0%
d) Sulphurification
Q.17.
When milk is heated at 62°C for 30 minutes and then cooled, the process is called …… [ CBSE 1996 ]
17%
a) Sterilization
67%
b) Pasteurisation
17%
c) Nitrification
0%
d) Freezing
Q.18.
Organisms without any specific shape are … [ MPPMT 1997]
0%
a) Viruses
60%
b) Mycoplasmas
40%
c) Bacteria
0%
d) Cyanobacteria
Q.19.
Chemoautotrophs derive their energy from … .. [ Pb PMT 1998]
0%
a) Sun
80%
b) Inorganic chemicals
20%
c) Dead organisms
0%
d) Living organisms
Q.20.
Transfer of genetic information through transduction involves … [ CBSE 1998]
20%
a) Conjugation
40%
b) Bacteriophage released from donor cell
0%
c) Another bacterium
40%
d) Physical contact between donor and recipient strains
Q.21.
Azotobacter and Bacillus polymyxa are … [ CBSE 1996]
0%
a) Decomposers
40%
b) Non-symbiotic nitrogen fixer
40%
c) Symbiotic nitrogen fixer
20%
d) Pathogenic bacteria
Q.22.
Which do not give out O2 … [ CPMT 2003]
0%
a) Green algae
20%
b) Blue green algae
20%
c) Green plants
60%
d) Photosynthetic bacteria
Q.23.
Heterocysts present in Nostoc are specialized for … .. [ MPPMT 1990]
17%
a) Fragmentation
50%
b) Nitrogen fixation
0%
c) Storage
33%
d) Photosynthesis
Q.24.
During conjugation, bacteria attach by means of … .. [ RPMT 1998]
17%
a) Flagella
17%
b) Pili
33%
c) Cilia
33%
d) Hair
Q.25.
Wine turns sour … .. [ MPPMT 1991 ]
14%
a) On exposure to light
57%
b) Contamination by aerobic bacteria Acetobacter aceti
29%
c) Contamination by anaerobic bacteria
0%
d) On heating
Q.26.
A filament of Nostoc without its mucilage sheath is called … [ AIIMS 1998]
17%
a) Mycelium
83%
b) Trichome
0%
c) Hypha
0%
d) Colony
Q.27.
The motile bacteria are able to move by : …[AIPMT 2014]
0%
a) cilia
14%
b) pili
14%
c) fimbriae
71%
d) flagella
Q.28.
Archaebacteria differ from eubacteria in : ….[AIPMT 2014]
0%
a) Cell shape
25%
b) Mode of reproduction
62%
c) Cell membrane structure
12%
d) Mode of nutrition
Q.29.
Viruses have : …[AIPMT 2014]
17%
a) Single chromosome
17%
b) Both DNA and RNA
67%
c) DNA enclosed in a protein coat
0%
d) Prokaryotic nucleus
Q.30.
Which of the following shows coiled RNA strand and capsomeres ? [AIPMT 2014]
14%
a) Measles virus
43%
b) Retrovirus
29%
c) Poliovirus
14%
d) Tobacco mosaic virus
Q.31.
Which one of the following is not an inclusion body found in prokaryotes? …[AIPMT 2015]
0%
a) Polysome
40%
b) Phosphate granule
0%
c) Cyanophycean granule
60%
d) Glycogen granule
Q.32.
The active form of Entamoeba histolytica feeds upon: …[AIPMT 2015]
17%
a) blood only
17%
b) erythrocytes; mucosa and submucosa of colon
50%
c) mucosa and submucosa of colon only
17%
d) food in intestine
Q.33.
Which of the following statements is wrong for viroids? …[AIPMT-2016]
20%
a) They lack a protein coat
20%
b) They are smaller than viruses
20%
c) They cause infections
40%
d) Their RNA is of high molecular weight
Q.34.
Which of the following is not a feature of the plasmids? …[AIPMT-2016]
17%
a) Independent replication
0%
b) Circular structure
67%
c) Transferable
17%
d) Single - stranded
Q.35.
Which of the following rRNAs acts as structural RNA as well as ribozyme in bacteria ? …[NEET 2016]
33%
a) 23 S rRNA
17%
b) 5.8 S rRNA
50%
c) 5 S rRNA
0%
d) 18 S rRNA
Q.36.
Methanogens belong to : …[NEET 2016]
0%
a) Dinoflagellates
0%
b) Slime molds
67%
c) Eubacteria
33%
d) Archaebacteria
Q.37.
Which of the following are found in extreme saline conditions? ….[NEET- 2017]
67%
a) Archaebacteria
0%
b) Eubacteria
33%
c) Cyanobacteria
0%
d) Mycobacteria
Q.38.
Which of the following are found in extreme saline conditions? ….[NEET- 2017]
75%
a) Archaebacteria
25%
b) Eubacteria
0%
c) Cyanobacteria
0%
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]
0%
a) Bacillus
0%
b) Pseudomonas
100%
c) Mycoplasma
0%
d) Nostoc
Q.40.
Viroids differ from viruses in having : ….[NEET- 2017]
25%
a) DNA molecules with protein coat
25%
b) DNA molecules without protein coat
25%
c) RNA molecules with protein coat
25%
d) RNA molecules without protein coat
Q.41.
Which of the following components provides sticky character to the bacterial cell? ….[NEET- 2017]
0%
a) Cell wall
0%
b) Nuclear membrane
17%
c) Plasma membrane
83%
d) Glycocalyx
Q.42.
Cell wall is absent in : [ ReAIPMT 2015]
0%
a) Nostoc
0%
b) Aspergillus
25%
c) Funaria
75%
d) Mycoplasma
Q.43.
Select the wrong statement : [ ReAIPMT 2015]
0%
a) Mosaic disease in tobacco and AIDS in human being are caused by viruses
25%
b) The viroids were discovered by D.J. Ivanowski
25%
c) W.M. Stanley showed that viruses could be crystallized
50%
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]
75%
a) Genera Plantarum
25%
b) Origin of Species
0%
c) Die Naturlichen Pflazenfamilien
0%
d) Species Plantarum
Q.45.
Bacteria involved in two-step conversion of ammonia into nitrate are … [ CPMT 2004]
0%
a) Azotobacter and Nitrosomonas
0%
b) Pseudomonas and Nitrobacter
50%
c) Azotobacter and Achromobacter
50%
d) Nitrosomnas and Nitrobacter
Q.46.
Heterocysts, specialized for nitrogen fixation, occur in certain … .. [ BHU 1995]
0%
a) Red algae( batrachospermum)
0%
b) Green algae ( Spirogyra)
80%
c) Blue-green algae (Anabaena)
20%
d) Brown algae ( Laminaria)
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