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Home » Medical Science » Microbiology » Aptitude Test - 4
1.Which is most likely to be exposed on the surface of a gram-negative bacterium?
A. Pore protein (porin)
B. Protein involved in energy generation
C. Lipoteichoic acid
D. Pore protein (porin)
2.The last step in synthesis of peptidoglycan is
A. attachment of a peptide to muramic acid
B. attaching two amino acids to form a cross-link
C. attachment of a portion of peptidoglycan to a membrane lipid
D. attachment of a peptide to muramic acid
3.Cytoplasmic inclusions include
A. ribosomes
B. mesosomes
C. fat globules
D. ribosomes
4.The cocci which forms a bunch and irregular pattern are
A. Staphylococci
B. diplococci
C. Tetracocci
D. Staphylococci
5.Chemotaxis is a phenomenon of
A. swimming away of bacteria
B. swimming towards a bacteria
C. swimming away or towards of bacteria in presence of chemical compound
D. swimming away of bacteria
6.The structure responsible for motility of bacteria is
A. pilli
B. flagella
C. sheath
D. pilli
7.The next to last step in peptidoglycan biosynthesis is
A. synthesis of the NAM-peptide subunit
B. removal of the subunit from bactoprenol
C. linking the sugar of the disaccharide-peptide unit to the growing peptidoglycan chain
D. synthesis of the NAM-peptide subunit
8.The cocci which forms a chain is
A. Streptococci
B. diplococci
C. Staphylococci
D. Streptococci
9.The arrangement, in which flagella are distributed all round the bacterial cell, is known as
A. lophotrichous
B. amphitrichous
C. peritrichous
D. lophotrichous
10.Periplasm is
A. the area between the inner and outer membranes of gram-negative bacteria
B. the area between the inner and outer membranes of Gram-positive bacteria
C. the interior portion of mitochondria
D. the area between the inner and outer membranes of gram-negative bacteria
11.Which of the following has peptidoglycan as a major constituent of cell wall?
A. Gram-negative bacteria
B. Gram-positive bacteria
C. Fungi
D. Gram-negative bacteria
12.The common word for bacteria which are helically curved rods is
A. cooci
B. pleomorphic
C. bacillus
D. cooci
13.The bacteria deficient in cell wall is
A. Treponema
B. Mycoplasma
C. Staphylococcus
D. Treponema
14.The common word for bacteria which are spherical in shape is
A. cocci
B. bacilli
C. spirilla
D. cocci
15.Single or clusters of flagella at both poles is known as
A. monotrichous
B. petritrichous
C. amphitrichous
D. monotrichous
16.Which of the following bacterial genera (that produces endospore) have medical importance?
A. Clostridium
B. Bacillus
C. Both (a) and (b)
D. Clostridium
17.Microcapsules are composed of
A. proteins
B. polysaccharides
C. lipids
D. proteins
18.Gram positive cells have a
A. second outer membrane that helps to retain the crystal violet stain
B. multiple layer of peptidoglycan that helps to retain the crystal violet stain
C. thick capsule that traps the crystal violet stain
D. second outer membrane that helps to retain the crystal violet stain
19.The common word for bacteria which are straight rod in shape is
A. cooci
B. bacilli
C. spirilla
D. cooci
20.A single polar flagella is known as
A. monotrichous
B. lophotrichous
C. amphitrichous
D. monotrichous
21.Teichoic acids are typically found in
A. cell walls of gram positive bacteria
B. outer membranes of gram positive bacteria
C. cell walls of gram negative bacteria
D. cell walls of gram positive bacteria
22.In eukaryotic cells, ribosomes are
A. 70S
B. 60S
C. 80S
D. 70S
23.Porins are located in
A. the outer membrane of gram-negative bacteria
B. the peptidoglycan layer of gram-positive bacteria
C. the cytoplasmic membrane of both gram-negative and gram-positive bacteria
D. the outer membrane of gram-negative bacteria
24.Which of the following is exposed on the outer surface of a gram-negative bacterium?
A. O-antigen of lipopolysaccharide (LPS)
B. Polysaccharide portion of lipoteichoic acid (LTA)
C. Braun lipoprotein
D. O-antigen of lipopolysaccharide (LPS)
25.Which of the following does not contain protein?
A. Pili
B. Flagellum
C. Lipoteichoic acid
D. Pili
26.Swimming towards a chemical of bacteria is termed as
A. positive chemotaxis
B. negative chemotaxis
C. phototaxis
D. positive chemotaxis
27.Chemically the capsule may be
A. polypeptide
B. polysaccharide
C. either (a) or (b)
D. polypeptide
28.Peptidoglycan is found only in the bacterial
A. cell membrane
B. glycocalyx
C. cell wall
D. cell membrane
29.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
A. α- 1,4-glycosidic bond
B. β-1,6-glycosidic bond
C. α- 1,6-glycosidic bond
D. α- 1,4-glycosidic bond
30.Which of the following organism has sterols in their cytoplasmic membrane?
A. Clostridum
B. Proteus
C. Mycoplasma
D. Clostridum
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