Bacteriology Quiz
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The equation used to obtain bacterial population by binary fission is
A. N=No2n
B. log N/No = (0.3010)n
C. log (N/No) = nlog2
D. All of the above
Staphylococcus epidermidis causes pimples
A. TRUE
B. FALSE
Which phase in a population growth curve is associated with no increase or decrease in population?
A. lag phase
B. logarithmic phase
C. stationary phase
D. death phase
An intermediary ring of the gram-negative bacterium:
A. L-ring
B. Basal ring
C. P-ring
D. S-ring
Which of the following is absent in Gram positive bacteria?
A. Teichoic acid
B. LPS
C. Murein
D. Capsules
Which of the following can be easily washed off?
A. S-Layer
B. Outer membrance
C. Capsules
D. Slime layer
Microaerophilic bacteria are those which require
A. 21% oxygen for growth
B. low levels of oxygen for growth (lesser than O2 present in atmosphere)
C. oxygen for activation of enzymes
D. none of the above
Because penicillin prevents peptidoglycan synthesis, it is more effective on cells.
A. Gram negative
B. Gram positive
C. mamalian
D. fungi
crystal violet during gram staining of bacteria is retained in ?
A. gram positive
B. gram negative
C. ziehl neelson stain
D. none of the above
Propionic acid fermentation is carried out by several bacteria that belong to the genus Propionibacterium and to the species clostridium propionicum. What is the initial material used to start propionic acid fermentation?
A. Glucose only
B. Lactate only
C. Both glucose and lactate
D. None
Psychrophiles would be expected to grow
A. in hot spring
B. on the human body
C. at refrigenation temperature
D. at low pH
CreS deficient or mutant cell will become
A. Spherical in shape
B. Straight rods
C. Curve shape
D. Comma shape
Which of the following is the causative agent of dental caries?
A. S. pneumoniae
B. S. pyogenes
C. S. mutans
D. S. faecalis
Below are the general characteristics nitrogen-fixing bacteria except
A. Free living or symbiotic
B. Non-spore forming
C. Non-motile
D. Use nitrogen gas as their energy source
Exponential phase of growth curve of bacteria is of limited duration because of
A. rise in cell density
B. accumulation of toxic metabolites
C. exhaustion of nutrients
D. all of the above
Microorganisms that can be found thriving in icy-cold climates would be considered….
A. barophiles
B. thermophiles
C. mesophiles
D. psychrophiles
E. bibliophil
The amorphous version of a glycocalyx:
A. Capsule
B. Vi antigen
C. Slimy layer
D. None of the choices
New Flagellin protein are added at the ______ of flagella.
A. Base
B. Tip
C. Middle
D. Hook
The term obligate anaerobe refers to an organism that
A. doesn’t use oxygen but tolerate it
B. is killed by oxygen
C. uses oxygen when present or grows with oxygen when oxygen is absent
D. prefers to grow without oxygen
Example of aerobic bacteria ?
A. bacillus cereus
B. clostridium perfringens
C. clostridium botulinum
D. all of the above
What is the color of the pigment xanthomonadin?
A. Blue
B. Yellow
C. Purple
D. Pink
which phase refers to maturation of individual bacteria without division ?
A. lag phase
B. log phase
C. exponential phase
D. stationary phase
Darting motility:
A. Capnocytophaga spp.
B. Campylobacter spp.
C. Corynebacterium spp.
D. Clostridium spp.
Which plasmid contains the genes required for conjugation?
A. R Plasmids
B. T Plasmid
C. F Plasmid
D. Col plasmid
Head lice are a type of parasite responsible for contagious diseases and conditions
A. TRUE
B. FALSE
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