Microbial Growth Quiz 1B

What is the minimum growth temperature for psychrophiles?

• 10°C

• 25°C

• 40°C

• 60°C

Which type of microbes are cold-tolerant and cause food spoilage?

• Mesophiles

• Psychrotrophs

• Thermophiles

• Psychrophiles

Most bacteria grow between which pH range?

• 3.0 and 4.0

• 10.0 and 11.0

• 6.5 and 7.5

• 8.0 and 9.0

What is used to make DNA, RNA, ATP, and membranes?

• Carbon

• Nitrogen

• Sulfur

• Phosphorus

Which inorganic elements are required in small amounts as enzyme cofactors?

• Nitrogen

• Oxygen

• Carbon

• Trace Elements

What is used to distinguish colonies of different microbe types?

• Hemolysis on blood agar

• Mannitol fermentation

• pH indicator (color)

• Agar

Which method is used to remove oxygen in anaerobic culture?

• CO2-packet

• Candle jar

• Anaerobic jar

• Oxyrase

What is the time period for one cell to divide?

• 1 hour

• 10 minutes

• 12 hours

• Generation Time varies

What is used for small population samples in direct measurements of microbial growth?

• Turbidity measurement

• Agar

• Filtration

• Plate Counts

Which method is used to preserve bacteria by freezing and dehydrating in a vacuum?

• Budding

• Binary fission

• Lyophilization

• Deep-freezing