Online Microbiology Test - Microbiology Test 9

Instruction:

  • This is a FREE online test. Beware of scammers who ask for money to attend this test.
  • Total number of questions: 20.
  • Time allotted: 30 minutes.
  • Each question carries 1 mark; there are no negative marks.
  • DO NOT refresh the page.
  • All the best!

Marks : 2/20


Total number of questions
20
Number of answered questions
0
Number of unanswered questions
20
Test Review : View answers and explanation for this test.

1.
Which of the following may be most likely to be missing from a gram-positive bacterium?
Penicillin binding protein
Peptidoglycan
Lipopolysaccharide
Phospholipid bilayer membrane
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2.
Which of the following bacteria dies quickly after drying?
Treponema pallidium
Mycobacterium tuberculosis
Staphylococcus aureus
Pseudomonas aeruginosa
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3.
Intestinal bacteria can grow in the presence of __________ whereas nonintestinal bacteria are usually inhibited.
bile salts
low concentration of various dyes
sugars
low levels of nitrogen
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4.
The ability of Vibrio fischeri to produce bioluminescence chemicals only when a certain population density has been reached is an example of
Liebig's law of the minimum
Shelford's law of tolerance
quorum sensing
Heisenberg's principle of uncertainty
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5.
The fragmentation occurs in
Streptomyces species
Nocardia species
Bacillus subtilis
None of these
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6.
What is the primary source of food for marine life?
Phytoplankton
Zooplankton
Sea weed
Grass
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7.
The acquisition energy by glucose fermentation requires
substrate-level phosphorylation
electron transport of electrons from NADH
long-chain fatty acid oxidation
the enzyme formic-hydrogen lyase
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8.
When acetate is the sole source of carbon for some microorganisms, the cycle which is used, is called
pentose phosphate pathway
glycolyic pathway
glyoxylate pathway
oxaloacetate pathway
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9.
Which of the following type of recombination does not require homologous sequences and is utilized by mobile genetic elements that move about chromosomes?
Mutagenic recombimation
Site-specific recombination
Replicative recombination
General recombination
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10.
The plasmid-mediated properties is/are
fermentation of lactose
production of enterotoxin
resistance to antibiotics
all of these
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11.
T cell receptors (or TCR) on CD4+ T cells
recognize peptides not associated with MHC molecules
recognize peptides associated with MHC class I molecules
recognize peptides associated with MHC class II molecules
are secreted out into the environment to bind antigens
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12.
The gram-positive bacteria lack __________ structure/component?
outer membrane
murein
teichoic acid
plasma membrane
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13.
Which of the phage types of Mycobacterium tuberculosis occurs most frequently in India?
Type A
Type B
Type C
Type I
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14.
Which of the following has been linked to Kaposi's sarcoma?
Epstein-Barr virus
Human T-cell lymphotropic virus
Human papilloma virus
Human herpes virus 8
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15.
Mumps vaccine is prepared from the cultures of
chick fibroblasts
African green monkey cells
healthy calves
sheep
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16.
The magnitude of BOD of wastewater is related to
bacterial count
amount of organic material
amount of inorganic material
all of the above
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17.
Group I C. botulinum strains generally includes in
all types of strains (proteolytic)A, B and F
all types of strains (non-proteolytic) E and F
all types of strains (proteolytic)C, D and F
none of the above
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18.
Which is not a major defense mechanism in the stomach?
Proteolytic enzymes
Low pH
Dense normal flora
All of these
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19.
A major difference between EHEC and EPEC is
EHEC secretes a Shiga-like toxin and EPEC does not
EHEC possesses a type III secretion system and EPEC does not
EPEC rearranges host cell actin and EHEC does not
EPEC passes through the placenta to infect the fetus and EHEC does not
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20.
An "International Unit" of penicillin activity established in 1944 is amount of penicillin equivalent to
0.6 micrograms of crystalline penicillin G of about 98% purity
0.6 micrograms of crystalline penicillin F of about 98% purity
0.8 micrograms of crystalline penicillin G of about 98% purity
0.8 micrograms of crystalline penicillin G of about 90% purity
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*** END OF THE TEST ***
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