Microbiology Quiz 4

What is the primary purpose of total microbial count?

• To identify specific pathogens.

• To measure the general level of hygiene or contamination.

• To observe microorganisms under a microscope.

• To sterilize equipment.

Which of the following is NOT a method for total microbial count?

• Plate count method.

• Turbidity test.

• PCR.

• Membrane filtration.

What is the principle behind the plate count method?

• Measuring cloudiness in liquid.

• Counting colonies on agar plates.

• Filtering bacteria from liquid.

• Using selective media.

Which of the following is a pathogen?

• Yeast.

• E. coli.

• Algae.

• Protozoa.

What is the primary function of selective media?

• To allow all bacteria to grow.

• To inhibit certain bacteria.

• To differentiate bacterial species.

• To sterilize equipment.

Which of the following is a molecular method for detecting pathogens?

• Culture on selective media.

• Biochemical tests.

• PCR.

• Gram staining.

What is the recommended dilution factor for calculating CFU/mL?

• 1:10.

• 1:100.

• 1:1000.

• 1:10,000.

Which of the following is NOT a component of culture media?

• Antibiotics.

• Vitamins.

• Carbohydrates.

• Oxygen.

What is the primary function of a colony counter?

• To measure pH.

• To count colonies on agar plates.

• To sterilize equipment.

• To prepare culture media.

Which of the following is a natural medium?

• Minimal salt medium.

• Potato dextrose agar.

• Milk.

• Synthetic medium.