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Growth and Nutrition of Bacteria

Growth and Nutrition of Bacteria
Which of the following is the suitable temperature range for mesophiles?

20-30°C
25-40°C
>40°C
None of these

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Growth and Nutrition of Bacteria
A culture broth tube was very turbid at the bottom of the tube but clear at the top of the tube indicating that the

organism should be grown in an anaerobic chamber
organism cannot produce superoxide dismutase and/or catalase
organism can tolerate oxygen
broth is sterile

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Growth and Nutrition of Bacteria
In the exponential phase, the cells and cell mass

double at a constant rate
are constant
decreases
first increases then decreases

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Growth and Nutrition of Bacteria
What is the primary source of food for marine life?

Sea weed
Grass
Phytoplankton
Zooplankton

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Growth and Nutrition of Bacteria
An organism is completely dependent on atmospheric O2 for growth. This organism is

osmotolerant
acidophile
obligate aerobe
facultative anaerobe

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Growth and Nutrition of Bacteria
Which of the following procedures uses a photocell to measure absorbance of a culture to regulate the flow of culture media?

Petroff-Hausser chamber
Hemostat
Coulter Counter
Trubidostat

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