Ch.9 Microbiology
Terms
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Most of the fungi grow optimally between the pH,
a. 9.0-10.0
b. 4.0-5.0
c. 5.0-6.0
d. 7.0-8.0 - 5.0-6.0
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2. Microorganisms grow at the highest rate during,
a. Stationary phase
b. Log phase
c. Lag phase
d. Death phase - Log phase
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Which one of the following temperature can kill mesophile?
a. -50ï‚°C
b. 9ï‚°C
c. 60ï‚°C
d. 0ï‚°C - 60ï‚°C
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The term trace elements refers to,
a. vitamins
b. The elements CNHOPS
c. Nitrogen, Phosphorus
d. Small mineral requirements - Small mineral requirements
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The autotrophs are the organisms which,
a. Utilize CO2 as carbon source
b. Utilize organic source of carbon
c. Utilize chemicals as energy source.
d. Both a and b. - Utilize CO2 as carbon source
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Most bacteria grow between the pH,
a. 9.0-10.0
b. 4.0-5.0
c. 5.0-6.0
d. 6.0-8.0 - d. 6.0-8.0
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7. High salt concentration kills bacteria by causing,
a. Osmolysis
b. Plasmolysis
c. Affecting respiration
d. Changing pH - a. Osmolysis
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Which one of the following is the indirect way of measuring growth?
a. Turbidity
b. Plate count
c. Filtration
d. Microscopic count - a. Turbidity
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Growth of anaerobic bacteria is inhibited by,
a. Nitrogen
b. Sugar
c. Sulfur
d. Molecular oxygen - Molecular oxygen
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Thermophiles grow between the temperature range,
a. –10C to 20C
b. 40ï‚°C to 72ï‚°C
c. 10ï‚°C to 50ï‚°C
d. 0ï‚°C to 30ï‚°C - b. 40ï‚°C to 72ï‚°C