applied environmental microbiology

What must water be deemed after purification?

• Contaminated

• Potable

• Salty

• Acidic

Which type of organisms are detected to ensure water safety?

• Viruses

• Indicator organisms

• Algae

• Fungi

What are coliforms classified as?

• Gram positive, cocci, non-lactose fermenters

• Gram negative, bacillus, lactose fermenters

• Gram positive, bacillus, lactose fermenters

• Gram negative, cocci, non-lactose fermenters

Which of the following is an example of a coliform?

• Staphylococcus aureus

• E. coli

• Salmonella typhi

• Vibrio cholerae

What is the first step in the multiple tube fermentation test?

• Confirmed test

• Completed test

• Presumptive test

• Final test

Which broth is used in the presumptive test of the multiple tube fermentation test?

• Brilliant green lactose bile broth

• Eosin methylene blue agar

• Lactose lauryl tryptose broth

• Nutrient agar

What does the confirmed test in the multiple tube fermentation test detect?

• Non-coliforms

• True coliforms and fecal coliforms

• Gas formation

• False positives

What medium is used in the completed step of the multiple tube fermentation test?

• Lactose lauryl tryptose broth

• Brilliant green lactose bile broth

• Eosin methylene blue agar

• Durham tube

What is the purpose of the membrane filter technique in water testing?

• To detect the presence of viruses

• To filter out large particles

• To transfer the filter to agar for further analysis

• To measure the pH level of water

In the presence-absence test, which indicator is used to detect pH changes?

• Methyl red

• Bromocresol blue

• Phenolphthalein

• Litmus