Growth and Nutrition of Bacteria

 

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Growth and Nutrition of Bacteria

Question 1
Microaerophilic bacteria are those which require
A
21 % oxygen for growth
B
low levels of oxygen for growth (lesser than O$_{2}$ present in atmosphere)
C
oxygen for activation of enzymes
D
none of the above

Question 2
The ability of Vibrio fischeri to produce bioluminescence chemicals only when a certain population density has been reached is an example of
A
Liebig's law of the minimum
B
Shelford's law of tolerance
C
quorum sensing
D
Heisenberg's principle of uncertainty

Question 3
Organisms, using organic compounds as electron donors are called
A
lithotrophs
B
phototrophs
C
chemotrophs
D
organotrophs

Question 4
Nutrient content and biological structures are considered as
A
implicit factor for microbial growth
B
intrinsic factor for microbial growth
C
processing factor
D
none of the above

Question 5
Which of the following is used to grow bacterial cultures continuously?
A
Chemostat
B
Coulter Counter
C
Hemostat
D
Petroff-Hausser chamber

Question 6
Which of the following is the suitable temperature range for mesophiles?
A
20-30$^\circ$C
B
25-40$^circ$C
C
$>$40$^\circ$C
D
None of these

Question 7
A culture broth tube was very turbid at the surface but clear throughout the rest of the tube indicating that the
A
organism are aerobes
B
organism should be grown in an anaerobic chamber
C
organism cannot produce superoxide dismutase and/or catalase
D
organism cannot tolerate oxygen

Question 8
A culture broth tube was very turbid at the bottom of the tube but clear at the top of the tube indicating that the
A
broth is sterile
B
organism can tolerate oxygen
C
organism cannot produce superoxide dismutase and/or catalase
D
organism should be grown in an anaerobic chamber

Question 9
The fragmentation occurs in
A
Streptomyces species
B
Nocardia species
C
Bacillus subtilis
D
None of these

Question 10
Quantitative measurement of bacterial growth can be carried out by measuring
A
cell count
B
cell mass
C
cell activity
D
all of these
There are 10 questions to complete.

 

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