Microbiology Quiz

What is the primary purpose of using agar in microbiology?

• To dissolve microbial nutrients

• To provide a solid surface for microbial growth

• To disinfect the culture medium

• To provide oxygen to the microbes

Which technique is used to isolate a pure culture of microorganisms?

• Streak plate method

• Gram staining

• Serial dilution

• PCR

What is the purpose of autoclaving in microbiological practices?

• To grow microorganisms at high temperatures

• To sterilize equipment and media

• To provide nutrients to bacteria

• To enhance microbial growth

Which of the following is a characteristic of selective media?

• Supports the growth of all microorganisms

• Inhibits the growth of unwanted organisms

• Does not change color in the presence of specific bacteria

• Is used for fermenting food products

What does a gram stain differentiate between?

• Gram-positive and gram-negative bacteria

• Bacteria and viruses

• Fungi and bacteria

• Microbial growth rates

Which of the following is NOT a common laboratory technique for cultivating microorganisms?

• Pour plate method

• Streak plate method

• Wet mount preparation

• Antibody testing

What is the function of a biosafety cabinet in a microbiology laboratory?

• To provide a sterile environment for microbial growth

• To protect the researcher from harmful microorganisms

• To enhance the growth rate of microorganisms

• To store microbial cultures at low temperatures

Which type of media is used to differentiate bacteria based on metabolic activities?

• Selective media

• Differential media

• Enriched media

• Transport media

Which of the following methods is used to count bacteria in a sample?

• Streak plate method

• Microscopic count

• Polymerase chain reaction (PCR)

• Serial dilution and plating

What is the purpose of using a spread plate method?

• To isolate individual colonies

• To mix microbial cultures

• To detect bacterial infections

• To purify DNA samples