Quiz on Prokaryotic Microbes and Microbial Growth

What temperature range do psychrophiles prefer for optimal growth?

• 20° to 40°C

• 0° to 20°C

• 40° to 60°C

• 80°C or higher

Which type of bacteria can grow in the absence of oxygen?

• Obligate aerobes

• Anaerobic bacteria

• Facultative anaerobes

• Microaerophiles

What is the optimum temperature range for mesophiles?

• 0° to 20°C

• 20° to 40°C

• 40° to 60°C

• 80°C or higher

What is the primary gas that influences microbial growth?

• Argon

• Hydrogen

• Oxygen

• Nitrogen

What is the term for organisms that thrive in high salt concentrations?

• Thermophiles

• Mesophiles

• Psychrophiles

• Halophiles

Which type of bacteria can tolerate but do not prefer high salt concentrations?

• Neutrophiles

• Acidophiles

• Halotolerant organisms

• Halophiles

What is the process by which bacteria reproduce asexually?

• Fragmentation

• Binary fission

• Spore formation

• Budding

During which phase of the bacterial growth curve does cell division decrease?

• Lag phase

• Log phase

• Death phase

• Stationary phase

What is the effect of hypertonic solutions on microbial cells?

• Cells swell and burst

• Cells remain unchanged

• Cells shrink and inhibit growth

• Cells grow rapidly

What pH range do most bacteria prefer for optimal growth?

• 0.1 to 5.4

• 5.4 to 8.5

• Above 12

• 7 to 12