E-PolyLearning

91. Semi-solid media, prepared with agar at concentrations of 0.5% or less are useful for the cultivation of
a. Microaerophillic bacteria
b. Lactobacilli
c. E.coli
d. all of these
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Answer: (a).Microaerophillic bacteria

92. The cell mass can be measured optically by determining the amount of light scattered by a suspension of cells. The measurements are usually at a wavelength of
a. 300-400nm
b. 400-500nm
c. 500-600nm
d. 600-700nm
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Answer: (d).600-700nm

93. Which of the following is not an indirect method for the measurement of cell mass?
a. Nutrient composition
b. Cell dry weight
c. Viscosity
d. Heat evolution
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Answer: (b).Cell dry weight

94. Callus cultures are amorphous cell aggregates arising from the unorganized growth of explants on an
a. liquid medium
b. solid nutrient medium
c. aseptic solid nutrient medium
d. solid or liquid medium
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Answer: (c).aseptic solid nutrient medium

95. The protoplast can be used to
a. modify genetic information
b. create plant hybrid
c. study plant viral infections
d. all of these
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Answer: (d).all of these