Concept explainers
Drinking water utilities monitor their production system for the occurrence of
- a. methanogens.
- b. coliform bacteria.
- c. nematodes.
- d. yeasts.
Introduction:
Indicator organism serves as an indicator for the presence of another organism in a system. In water, indicator organism is used to detect other disease-causing pathogens and bacteria which have a high potential for health hazards.
Answer to Problem 1MCQ
Correct answer:
Drinking water utilities monitor their production system for the occurrence of coliform bacteria. Therefore, option (b) is correct.
Option (b) is given as “coliform bacteria”.
Explanation of Solution
Justify the reason for the correct statement:
Indicator organisms are used to test the water quality. Their presence notifies the possible contamination of the pathogen in water; the presence of coliforms and E.coli specify the fecal and sewage contamination and it also indicates the presence of a pathogen in water. Coliforms and E. coli presence works as an indicator organism in contaminated water.
Hence, option (b) is correct.
Justify the reasons for the incorrect statements:
Option (a) is given as “methanogens”.
Methanogens are used to break down the organic pollutant from the water. They are used in the production of methane. Hence, it is a wrong answer.
Option (c) is given as “nematodes”.
Nematodes are used to remove fecal bacteria from contaminated water. Hence, it is a wrong answer.
Option (d) is given as “yeast”.
Yeast is used to treating the water contaminated with a starch such as vermicelli water. Hence, it is a wrong answer.
Hence, options (a), (c), and (d) are incorrect.
The presence of indicator organism in contaminated water identifies the presence of other disease-causing pathogens.
Want to see more full solutions like this?
Chapter 25 Solutions
Microbiology: A Systems Approach
- Why antibacterial drugs are ineffective against: A. Fungal Infections B. Viral infections C. Helminthic worm infectionsarrow_forwardAn infectious dose of several million cells in enteric infections seems like a lot. a. In terms of the size and abundance of microbes, could you see a cluster containing that many cells with the naked eye? b. About how long would it take an average bacterial species to reach the infectious dose of a million cells starting from a single cell? c. Why do enteric diseases require a relatively higher infectious dose than nonenteric diseases? d. Explain why antimicrobic therapy used on gram-negative bacterial infections could actually lead to illness rather than cure itarrow_forwardWhy does secondary treatment of wastewater require O2? A. Secondary treatment relies on anaerobic microbes to oxidize organic material. B.Secondary treatment relies on anaerobic microbes to reduce organic material. C.Secondary treatment relies on aerobic microbes to oxidize organic material. D.Photosynthetic bacteria are involved in secondary treatment and they require O2. E. Flocs require oxygen to facilitate biofilm formation.arrow_forward
- 1. Some bacteria have the ability to survive heat, lack of moisture, cold or acidic conditions by Forming: a. Parasites b. Vegetative states c. Colonies d. Spores 2. The primary responsibility of food establishment managers in pest control is to ensure: a. Pesticides are applied safely. b. The parking area is kept free of lifter. c. Good sanitation that will eliminate food, water, and harbourage areas. d. The pest control operator they use employs integrated pest management. 3. What are the proper steps in manual and mechanical dishwashing operations after pre- flushing? a. Wash, rinse, sanitize, and air-dry. b. Wash, rinse, sanitize, and towel dry c. Rinse, wash, sanitize, and towel dry. d. Rinse, wash, sanitize, and air dry.arrow_forwardEvery year, supposedly safe municipal water supplies causeoutbreaks of enteric illness.a. How in the course of water analysis and treatment might thesepathogens be missed?b. Why is there less tolerance for a fecal coliform in drinking orrecreational water than for other bacteria?arrow_forwardSelect the letter of the choice that best completes the statement. The processes used for the total elimination of all microorganisms, including spores, include all buta. steam.b. radiation.c. ethylene gas.d. alcohol.arrow_forward
- Which of the following types of patients should be placed into protective isolation? Select one: a. A leukopenic patient b. A patient with pneumonic plague c. A patient with tuberculosis d. A patient infected with MRSAarrow_forwardThe patient with ulcers on his face came to see a doctor. It's known that he has been recently returned to Ukraine from Turkmenia. The doctor diagnosed cutaneous leishmaniasis. How did the disease agent get into the patient's organism? Select one: a. By a sexual contact O b. By food O c. By a direct contact d. By an inoculation way e. By a respiratory wayarrow_forwardAll of the following bacteria cause food poisoning EXCEPT: a. Staphylococcus aureus b. Treponema pallidum c. Bacillus cereus d. Escherichia coli O157: H7arrow_forward
- Secondary metabolites of microbes are formed during thephase of growth.a. exponential b. stationary c. lag d. deatharrow_forwardWhich of the following treatments of sewage involves the use of anaerobic bacteria?A. Primary sedimentation tanksB. Aeration tanks in secondary treatmentC. Settling tanks in secondary treatmentD. Flat plate collectorE. Sludge digesterarrow_forwardWhich of the following statements is correct? a. Serial interval is the length of time a person can transmit or shed an infectious agent b. Contamination of the drinking water source of a community by infectious agent(s) will likely result in a continuous common source epidemic c. It is not possible for people who have not shown symptoms of measles yet, to transmit measles infection d. Mary Mallon was a chronic carrier of Vibrio choleraearrow_forward
- Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSONBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxAnatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
- Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & CompanyLaboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education