
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
GEN COMBO LOOSELEAF MICROBIOLOGY:A SYSTEMS APPROACH; CONNECT ACCESS CARD
- What is this?arrow_forwardMolecular Biology A-C components of the question are corresponding to attached image labeled 1. D component of the question is corresponding to attached image labeled 2. For a eukaryotic mRNA, the sequences is as follows where AUGrepresents the start codon, the yellow is the Kozak sequence and (XXX) just represents any codonfor an amino acid (no stop codons here). G-cap and polyA tail are not shown A. How long is the peptide produced?B. What is the function (a sentence) of the UAA highlighted in blue?C. If the sequence highlighted in blue were changed from UAA to UAG, how would that affecttranslation? D. (1) The sequence highlighted in yellow above is moved to a new position indicated below. Howwould that affect translation? (2) How long would be the protein produced from this new mRNA? Thank youarrow_forwardMolecular Biology Question Explain why the cell doesn’t need 61 tRNAs (one for each codon). Please help. Thank youarrow_forward
- Molecular Biology You discover a disease causing mutation (indicated by the arrow) that alters splicing of its mRNA. This mutation (a base substitution in the splicing sequence) eliminates a 3’ splice site resulting in the inclusion of the second intron (I2) in the final mRNA. We are going to pretend that this intron is short having only 15 nucleotides (most introns are much longer so this is just to make things simple) with the following sequence shown below in bold. The ( ) indicate the reading frames in the exons; the included intron 2 sequences are in bold. A. Would you expected this change to be harmful? ExplainB. If you were to do gene therapy to fix this problem, briefly explain what type of gene therapy youwould use to correct this. Please help. Thank youarrow_forwardMolecular Biology Question Please help. Thank you Explain what is meant by the term “defective virus.” Explain how a defective virus is able to replicate.arrow_forwardMolecular Biology Explain why changing the codon GGG to GGA should not be harmful. Please help . Thank youarrow_forward
- Stage Percent Time in Hours Interphase .60 14.4 Prophase .20 4.8 Metaphase .10 2.4 Anaphase .06 1.44 Telophase .03 .72 Cytukinesis .01 .24 Can you summarize the results in the chart and explain which phases are faster and why the slower ones are slow?arrow_forwardCan you circle a cell in the different stages of mitosis? 1.prophase 2.metaphase 3.anaphase 4.telophase 5.cytokinesisarrow_forwardWhich microbe does not live part of its lifecycle outside humans? A. Toxoplasma gondii B. Cytomegalovirus C. Francisella tularensis D. Plasmodium falciparum explain your answer thoroughly.arrow_forward
- Select all of the following that the ablation (knockout) or ectopoic expression (gain of function) of Hox can contribute to. Another set of wings in the fruit fly, duplication of fingernails, ectopic ears in mice, excess feathers in duck/quail chimeras, and homeosis of segment 2 to jaw in Hox2a mutantsarrow_forwardSelect all of the following that changes in the MC1R gene can lead to: Changes in spots/stripes in lizards, changes in coat coloration in mice, ectopic ear formation in Siberian hamsters, and red hair in humansarrow_forwardPleiotropic genes are genes that (blank) Cause a swapping of organs/structures, are the result of duplicated sets of chromosomes, never produce protein products, and have more than one purpose/functionarrow_forward
- Basic Clinical Lab Competencies for Respiratory C...NursingISBN:9781285244662Author:WhitePublisher:Cengage
- Comprehensive Medical Assisting: Administrative a...NursingISBN:9781305964792Author:Wilburta Q. Lindh, Carol D. Tamparo, Barbara M. Dahl, Julie Morris, Cindy CorreaPublisher:Cengage Learning
