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This quiz contains multiple-choice problems on isolation and industrially screening microbes, feedback control, industrial microorganisms’ preservation and improvement.
Which of the following dye is colourless at acidic pH and becomes red at basic pH?
Which of the following method is useful for detection and isolation of those microorganisms which are capable of growing on a particular nutrient medium?
Which of the following is not a criterion for the choice of an organism?
The organism must be genetically stable
The organism must be able to produce a high yield of product
The optimum temperature for the growth of an organism must be above 50°C
The organism must be able to grow in an easily available nutrient medium
The full-form of ATCC is
American Type Culture Collection
Automatic Type Counter and Classifier
American Type Counter Collection
American Type Classifier and Collection
Which of the following methods is not used in the isolation and screening of desired microorganisms?
Crowded plate technique
Auxanographic technique
Enrichment culture technique
Hanging drop technique
Screening involves the detection and isolation of microorganisms of interest. True or false?
True
False
Which of the following method is useful for the isolation and detection of organisms having the ability to produce antibiotics?
Crowded plate technique
Auxanographic technique
Enrichment culture technique
Indicator dye technique
Which of the following shows the inhibition zone when a particular organism is grown on a petri dish?
Growth factor producers
Antibiotic producers
Organic acid producers
Amino acid producers
Prototrophs are organisms that cannot synthesise all growth requirements for themselves. True or false?
True
False
Which of the following method is useful for isolation and detection of organisms having the ability to produce organic acids?
Crowded plate technique
Auxanographic technique
Enrichment culture technique
Indicator dye technique
What is the pH range of bromophenol blue?
3.0 – 4.6
8.0 – 10.0
5 – 8
6.4 – 8.0
Which of the following method is useful for isolation and detection of organisms having the ability to produce growth factors?
Crowded plate technique
Auxanographic technique
Enrichment culture technique
Indicator dye technique
Which of the following methods proceeds with two-plate preparation?
Crowded plate technique
Auxanographic technique
Enrichment culture technique
Indicator dye technique
Which of the following plate is used to detect and isolate organic acid producers?
Phenol red plate
Potato dextrose agar plate
MacConkey’s agar plate
Rose Bengal agar plate
A test tube contains 9 mL of distilled water. 1g of soil is added to that test tube, and the soil is allowed to settle down. Now, 1 mL of that stock solution is taken and transferred to the test tube containing 9 mL of distilled water. The process is repeated several times until the requirement is met. For this dilution, it may be said that the solution was diluted
100-fold
10-fold
1000-fold
2-fold
