Microbial Growth Quiz 1 SEPT 2023

What is the primary purpose of microbial growth?

• Energy production

• DNA replication

• Cell repair

• Increase in population

Which of the following is a phase of microbial growth characterized by a constant rate of cell division and exponential increase in cell numbers?

• Lag phase

• Log phase

• Stationary phase

• Death phase

In which phase of microbial growth do cells adapt to the new environment, synthesize essential molecules, and prepare for rapid growth?

• Lag phase

• Log phase

• Stationary phase

• Death phase

What is the limiting factor that eventually leads to the entry of microbial cells into the stationary phase?

• Nutrient depletion

• Accumulation of waste products

• Presence of antibiotics

• High temperature

Which of the following is an example of a direct method for measuring microbial growth?

• Turbidity measurement

• Plate count method

• Most probable number (MPN) method

• Biosensor technology

Which environmental factor has a direct impact on microbial growth by influencing enzymatic reactions?

• Osmotic pressure

• Temperature

• Oxygen concentration

• Nutrient availability

Which type of microbial growth curve exhibits a rapid decline in cell viability due to nutrient exhaustion and accumulation of toxic by-products?

• Exponential growth curve

• Logarithmic growth curve

• Stationary growth curve

• Decline growth curve

What is the main advantage of using the Most Probable Number (MPN) method for estimating microbial growth?

• It provides absolute cell counts.

• It is the fastest method available.

• It is suitable for a wide range of microorganisms.

• It is not affected by the growth phase.

What is a microorganism that cannot use oxygen and can be harmed by the presence of oxygen?

• Aerobes

• Microaerophiles

• Facultative anaerobes

• Anaerobes

Which of the following components is a common carbon source in microbial growth media?

• Sodium chloride

• Glucose

• Magnesium sulfate

• Potassium phosphate