A cluster of polar flagella is called
1.lophotrichous
2.amphitrichous
3.monotrichous
4.petritrichous
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A single polar flagella is known as
1.monotrichous
2.lophotrichous
3.amphitrichous
4.none of these
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 This about cell wall of gram-positive bacteria is true
1.cell wall comprises of many layers
2.the cell wall is thicker than the associated gram-negative bacteria
3.Cell wall comprises of teichoic acids
4.All of the above
Posted Date:-2021-03-06 14:16:54
 Which of these is exposed on the outer surface of a gram-negative bacterium?
1.Braun lipoprotein
2.O-antigen of lipopolysaccharide (LPS)
3.Polysaccharide portion of lipoteichoic acid (LTA)
4.Electron transport system components
Posted Date:-2021-03-06 14:16:54
 Which one of these has a Chinese letter arrangement?
1.Clostridium tetani
2.Mycobacterium tuberculosis
3.Bacillus anthracis
4.Corynebacterium diphtheriae
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Bacteria having no flagella are unable to
1.move
2.reproduce
3.stick to tissue surfaces
4.grow in nutrient agar
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Chemically the capsule may be
1.polypeptide
2.polysaccharide
3.either (a) or (b)
4.none of these
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Chemotaxis is a phenomenon of
1.swimming away of bacteria
2.swimming towards a bacteria
3.swimming away or towards of bacteria in presence of chemical compound
4.none of the above
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Cyanobacteria have
1.a gram-positive cell wall
2.a gram-negative cell wall
3.Neither (a) nor (b)
4.No cell wall
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Cytoplasmic inclusions include
1.ribosomes
2.mesosomes
3.fat globules
4.all of these
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Flagella in bacteria enable them to
1.reproduce
2. locomote
3.Thrive in nutrient agar
4.Adhere to tissue surfaces
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Flagella move the cell by
1.many flagella beating in a synchronous, whip-like motion
2.an individual flagellum beating in a whip-like motion
3.spinning like a propeller
4.attaching to nearby particles and contracting
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Genetic system is located in the prokaryotes in
1.nucleoid
2.chromatin
3.nuclear material
4.all of these
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Gram positive cells have a
1.second outer membrane that helps to retain the crystal violet stain
2.multiple layer of peptidoglycan that helps to retain the crystal violet stain
3.thick capsule that traps the crystal violet stain
4.periplasmic space that traps the crystal violet
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he protein from which hook and filaments of flagella are composed of, is
1.keratin
2.flagellin
3.gelatin
4.casein
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In eukaryotic cells, ribosomes are
1.70S
2.60S
3.80S
4.Not specific
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In which of the following, lipo-polysaccharide is a major constituent of outer membrane of the cellwall?
1.Gram-positive bacteria
2.Gram-negative bacteria
3.Fungi
4.None of these
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Which of this bacteria is resistant to penicillin as it lacks a cell wall?
1.Spirochetes
2.Cyanobacteria
3. Mycoplasmas
4.Bdellovibrios
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Microcapsules are composed of
1.proteins
2.polysaccharides
3.lipids
4.all of these
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Name the component of flagellum.
1.Filament
2.Hook
3.Basal body
4.All of these
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Peptidoglycan accounts for __________ of the dry weight of cell wall in many gram positive bacteria
1.50% or more
2.About 10%
3.11%+ 0.22%
4.About 20%
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Peptidoglycan is also known as
1.N-acetyl muramic acid
2.murein mucopeptide
3.N acetylglucosamine
4.mesodiaminopimetic acid
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Peptidoglycan is found only in the bacterial
1.cell membrane
2.glycocalyx
3.cell wall
4.spore
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Periplasm is
1.the area between the inner and outer membranes of gram-negative bacteria
2.the area between the inner and outer membranes of Gram-positive bacteria
3.the interior portion of mitochondria
4.the area outside the cell membrane that is influenced by the polymers
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Porins are located in
1.the outer membrane of gram-negative bacteria
2.the peptidoglycan layer of gram-positive bacteria
3.the cytoplasmic membrane of both gram-negative and gram-positive bacteria
4.the periplasmic space of gram-negative bacteria
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Single or clusters of flagella at both poles is known as
1.monotrichous
2.petritrichous
3.petritrichous
4.none of these
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Swimming towards a chemical of bacteria is termed as
1.positive chemotaxis
2.negative chemotaxis
3.phototaxis
4.magnetotaxis
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Teichoic acids are typically found in
1.cell walls of gram positive bacteria
2.outer membranes of gram positive bacteria
3.cell walls of gram negative bacteria
4.outer membranes of gram negative bacteria
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The arrangement, in which flagella are distributed all round the bacterial cell, is known as
1.lophotrichous
2.amphitrichous
3.peritrichous
4.monotrichous
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The bacteria deficient in cell wall is
1.Treponema
2.Mycoplasma
3.Staphylococcus
4.Klebsiella
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The cell wall of
1.gram-positive bacteria are thicker than gram-negative bacteria
2.gram-negative bacteria are thicker than gram-positive bacteria
3.both have same thickness but composition is different
4.none of these
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The cell walls of Gram positive bacteria contain two modified sugar, viz. N- acetylgucosamine (NAG) and N- acetylmuramic acid (NAM). They are covalently linked by
1.α- 1,4-glycosidic bond
2.β-1,6-glycosidic bond
3.α- 1,6-glycosidic bond
4.β- 1,4-glycosidic bond
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The cell walls of many gram positive bacteria can be easily destroyed by the enzyme known as
1.lipase
2.lysozyme
3.pectinase
4.peroxidase
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The cocci which forms a bunch and irregular pattern are
1.Staphylococci
2.diplococci
3.Tetracocci
4.Streptococci
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The cocci which forms a chain is
1.Streptococci
2.diplococci
3.Staphylococci
4.Tetracocci
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The common word for bacteria which are helically curved rods is
1.cooci
2.pleomorphic
3.bacillus
4.spirilla
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The common word for bacteria which are spherical in shape is
1.cocci
2.bacilli
3.spirilla
4.pleomorphic
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The common word for bacteria which are straight rod in shape is
1.cooci
2.bacilli
3.spirilla
4.pleomorphic
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The cooci which mostly occur in single or pairs are
1.Streptococci
2.Diplococci
3.Tetracocci
4.None of these
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The covalent bond which links the cell walls of gram-positive bacteria containing two modified sugars – N – acetylmuramic acid (NAM) and N-acetyl glucosamine (NAG) is
1.glycosidic bond
2.1,4-glycosidic bond
3. 1,6-glycosidic bond
4.glycosidic bond
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The last step in synthesis of peptidoglycan is
1.attachment of a peptide to muramic acid
2.attaching two amino acids to form a cross-link
3.attachment of a portion of peptidoglycan to a membrane lipid
4.binding of penicillin to a membrane protein
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The location where the bacterial chromosome concentrates is called
1.nucleus
2.nuclein
3.nucleoid
4.nucleose
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The next to last step in peptidoglycan biosynthesis is
1.synthesis of the NAM-peptide subunit
2.removal of the subunit from bactoprenol
3.linking the sugar of the disaccharide-peptide unit to the growing peptidoglycan chain
4.cross-linking the peptide side chains of peptidoglycan
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The other name for peptidoglycan is
1.mucopeptide
2.murein
3.both (a) & (b)
4.none of these
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The structure responsible for motility of bacteria is
1.pilli
2.flagella
3.sheath
4.capsules
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This is analogous to mesosomes of bacteria
1.Golgi apparatus of eukaryotes
2.Lysosomes of eukaryotes
3.Mitochondria of eukaryotes
4.None of the above
Posted Date:-2021-03-06 14:16:54
What is a cluster of polar flagella called?
1. Petritrichous
2.Monotrichous
3.Amphitrichous
4. Lophotrichous
Posted Date:-2021-03-06 14:16:54
What is Chemotaxis?
1.Swimming towards a bacteria
2. Swimming away of a bacteria
3.In the presence of a chemical compound, swimming towards or away of a bacteria
4.None of these
Posted Date:-2021-03-06 14:16:54
Which is most likely to be exposed on the surface of a gram-negative bacterium?
1.Pore protein (porin)
2.Protein involved in energy generation
3.Lipoteichoic acid
4.Phospholipids
Posted Date:-2021-03-06 14:16:54
Which of the following bacteria lack a cell wall and are therefore resistant to penicillin?
1.Cyanobacteria
2.Mycoplasmas
3.Bdellovibrios
4.Spirochetes
Posted Date:-2021-03-06 14:16:54
Which of the following bacterial genera (that produces endospore) have medical importance?
1.Clostridium
2.Bacillus
3.Both (a) and (b)
4.None of these
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Which of the following does not contain protein?
1.Pili
2.Flagellum
3.Lipoteichoic acid
4.Porin
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Which of the following has Chinese letter arrangement?
1.Bacillus anthracis
2.Mycobacterium tuberculosis
3.Clostridium tetani
4.Corynebacterium diphtheriae
Posted Date:-2021-03-06 14:16:54
Which of the following has peptidoglycan as a major constituent of cell wall?
1.Gram-negative bacteria
2.Gram-positive bacteria
3.Fungi
4.None of these
Posted Date:-2021-03-06 14:16:54
Which of the following is analogous to mesosomes of bacteria?
1.Mitochondria of eukaryotes
2.Golgi apparatus of eukaryotes
3.Lysosomes of eukaryotes
4.None of these
Posted Date:-2021-03-06 14:16:54
Which of the following is exposed on the outer surface of a gram-negative bacterium?
1.O-antigen of lipopolysaccharide (LPS)
2.Polysaccharide portion of lipoteichoic acid (LTA)
3.Braun lipoprotein
4.Electron transport system components
Posted Date:-2021-03-06 14:16:54
Which of the following is not true about peptidoglycan?
1.It is a polymer consisting of N-acetyl glucosamine, N-acetyl muramic acid and amino acids (alanine, lysine, etc.)
2.It is present in prokaryotic cell wall
3.It occurs in the form of a bag shaped macro molecule surrounding the cytoplasm membrane
4.None of the above
Posted Date:-2021-03-06 14:16:54
Which of the following is true about cell wall of gram-positive bacteria?
1.It consists of multiple layers
2.It is thicker than that associated with gram-negative bacteria
3.It contains teichoic acids
4.All of these
Posted Date:-2021-03-06 14:16:54
Which of the following may be most likely to be missing from a gram-positive bacterium?
1.Penicillin binding protein
2.Peptidoglycan
3.Lipopolysaccharide
4.Phospholipid bilayer membrane
Posted Date:-2021-03-06 14:16:54
Which of the following may contain fimbriae?
1.Gram-positive bacteria
2.Gram-negative bacteria
3.Both (a) and (b)
4.None of these
Posted Date:-2021-03-06 14:16:54
Which of the following organism has sterols in their cytoplasmic membrane?
1.Clostridum
2.Proteus
3.Mycoplasma
4.Bacillius
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Which of the following structure(s) is /are external to cell wall?
1.Flagella
2.Stalks
3.Sheath
4.All of these
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Which of these is a cocci occurring in single or pairs?
1. Diplococci
2.Streptococci
3.Tetracocci
4.None of the above
Posted Date:-2021-03-06 14:16:54