Why is coliform bacteria used to determine if water has been contaminated?
Answers
Because coliform bacteria are present in the digestive systems of humans and animals, their presence in water can indicate the potential for the water to be contaminated with harmful pathogens that could cause illness.
Coliform bacteria are commonly found in the intestines of warm-blooded animals, including humans, and are a type of indicator organism used to determine if water has been contaminated with fecal matter. Coliform bacteria are relatively easy to detect and are used as an indicator of water quality because they are typically present in large numbers in fecal matter and are easier to detect than other types of pathogens. Additionally, the presence of coliform bacteria in water can help to identify potential sources of contamination, which can aid in the development of effective strategies to protect public health.
The use of coliform bacteria as an indicator of fecal contamination is based on the assumption that if coliforms are present, there is a higher likelihood that other pathogenic bacteria or viruses that are also present in feces may be present in the water. Therefore, coliform bacteria are used as a screening tool to identify potential fecal contamination in water sources.
In addition to being commonly found in feces, coliform bacteria are also easy to detect and enumerate using standard laboratory methods. This makes them a convenient and cost-effective indicator for routine monitoring of water quality. If coliform bacteria are detected in a water sample, further testing can be done to determine if harmful pathogens are present and if the water is safe for human consumption.
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Related Questions
this area of the brain is embryologically derived from the forebrain and sometimes considered the most superior portion of the brain stem?
Answers
The area of the brain that is embryologically derived from the forebrain and is sometimes considered the most superior portion of the brain stem is the midbrain.
The midbrain, along with the hindbrain and forebrain, is one of the three primary regions of the developing vertebrate brain. The midbrain is located between the hindbrain and the diencephalon (part of the forebrain) and is involved in a variety of functions, including controlling eye movements, regulating attention and arousal, and processing auditory and visual information.
Despite its relatively small size, the midbrain plays a crucial role in many of the body's most basic functions and is involved in a number of important reflex pathways. It is also sometimes referred to as the mesencephalon, and its location near the top of the brain stem has led some to consider it the "superior" portion of the brain stem.
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a 67-year-old homeless man was seen in the ambulatory clinic for chest pain and sputum production. a mycobacterial culture showed the following: rough, non-pigmented colonies, which grew after two weeks at 35oc and failed to grow at other temperatures, serpentine cording, a strongly positive niacin test, nitrate reduction, and loss of catalase activity after heating at 68oc in ph 7. what is the most likely identification?
Answers
The most likely identification for the patient is mycobacterium tuberculosis infection.
Which morphological and biochemical characteristics are used for mycobacterium tuberculosis identification?Morphological: Mycobacterium tuberculosis colonies are identified by their rough, non-pigmented, irregular appearances. The optimum temperature for the growth of culture is 35°C. They have a slow growth rate and usually take a minimum of 2 weeks for visualization.
Mycobacterium tuberculosis forms rope-like aggregates with each other, called serpentine cording under acid-fast staining. This is one of the hallmarks of their identification.
Biochemical: In the Niacin Test and Nitrate Reduction Test, mycobacterium yields a strong positive result. They lose their catalase activity when heated at 68°C at pH 7.
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I really need help with this. Thank you.
Answers
Answer:
looks like two compounds so mixture
DUE IN 1 HOUR HELP! Please answer
Compare the carrying power of a small, mountain stream in the mountains with that of a slow large river that is about to enter the sea.
(Note: Needs to be detailed) [this is more of a Geology question]
Answers
Answer:
The carrying power of a small, mountain stream in the mountains with that of a slow large river that is about to enter the sea is explained below in details.
Explanation:
A mountain stream is a river or stream, normally with a sheer slope, running down a mountainside. Stream velocity is most noted in midstream near the exterior and is crawling along the stream bottom and shores due to friction.
The river stalls down at the entrance, so it doesn't have the energy to carry all the sand, dirt, and clay anymore. These deposits create the flat, regularly triangle-shaped tract of a delta.
Which include all of the forearm muscles in the deep layer of the anterior compartment?.
Answers
Flexor pollicis longus is one of the three muscles in the deep layer. Deep digitorum flexor. Infraorbital quadratus
What is the pronator quadratus's function?Function. The pronation of the radioulnar joint is a result of the pronator teres & pronator quadratus muscles working together. The radioulnar joint becomes pronated as this muscle contracts, pulling the distal end of the radii over the ulna.
How come my pronator quadratus hurts?At work or home, the pain can develop around the elbow just by lifting a bag and extending it outward. Using a screwdriver too far while extending the arm has caused some persons to get injuries. It is recognized that the muscles can tear in a number of situations, but they are all related to the muscles being stretched over their normal limits.
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Swollen and spongy petioles or leaf stalks keep the water hyacinth afloat , true or false
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True. The swollen and spongy petioles, or leaf stalks, of the water hyacinth help keep it afloat.
The petioles contain air spaces that provide buoyancy, allowing the plant to float on the water's surface. This adaptation is essential for the water hyacinth's survival, as it enables the plant to access sunlight for photosynthesis and absorb nutrients from the water.
The petioles also help in distributing the weight of the plant evenly, preventing it from sinking. Additionally, the spongy petioles act as a flotation device, allowing the water hyacinth to thrive in aquatic environments with varying water levels. So, the statement is true.
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Select the appropriate word(s) to complete the sentence.
Seedless plants alternate between
generations.
Answers
Seedless plants genetically alternate between generations.
What is the reproduction cycle of seedless plants like?
All seedless vascular plants have very similar life cycles. As in bryophytes, their life cycle has two alternating generations:
the gametophyte and the sporophyte. The sporophyte is always the dominant and free-living generation.With this information, we can conclude that seedless plants genetically alternate between generations.
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Answer:
two
Explanation: just trust me :>
Contained within the spongy sections of bones, red bone marrow is responsible for _____.
A. nutrient delivery
B. acid-base
C. movement
D. support
E. blood formation
F. communication
G. respiration
H. electrolyte balance
I. protection
Answers
Red bone marrow is responsible for blood formation. It produces red blood cells, white blood cells, and platelets, which are essential components of the circulatory and immune systems.
This process is known as hematopoiesis and occurs within the spongy sections of bones, such as the pelvis, sternum, and ribs. The red bone marrow contains stem cells that differentiate into the different types of blood cells, and these cells are then released into the bloodstream to perform their respective functions. This is a long answer, but it covers the importance and function of red bone marrow in the body.
The correct answer is:
E. blood formation
Red bone marrow is responsible for blood formation, specifically the production of red blood cells, white blood cells, and platelets. This process is known as hematopoiesis.
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What is Speciation? I am confused
Answers
Answer:
D- the formation of two or more species from a common ancestor.
What do scientists call the S-layer in archaebacteria?
Answers
Answer:
Surface layer
Answer: proteins or glycoproteins that make up the cell wall
Explanation: Hope this help
When will a recessive trait be seen
in an organism?
A. when at least one recessive allele is present
B. when there is no recessive allele present
C. when there is no dominant allele present
Answers
Answer:
c
Explanation:
Certain things need to come in and other things need to be send out of the cellWhich of the following is NOT example a the cell needs to bring into the cell?
A.Sugars
B.Oils
C.protein
D.fats
Answers
What are some things water will adhere to? and What are some things water will not adhere to?
Answers
Answer:
1. Water has an amazing ability to adhere (stick) to itself and to other substances. Hydrogen bonds form when hydrogen atoms covalently bonded to nitrogen (N), oxygen (O), or fluorine (F) in the form of covalent compounds such as ammonia (NH3), water (H2O) and hydrogen fluoride gas (HF).
2. In the case of water, hydrogen bonds form between neighboring hydrogen and oxygen atoms of adjacent water molecules. The attraction between individual water molecules creates a bond known as a hydrogen bond.
Fat and ATP are different molocules that can both be described as molocules in terms of energy storage.
This is a question from flvs and the awnsers are to long to type
Answers
The genetic basis for aggression states that ______ are important in understanding the biological basis of aggression. genes.
Answers
The genetic basis for aggression states that genes are important in understanding the biological basis of aggression.
The genetic basis for aggression refers to the idea that certain genes may contribute to the development of aggressive behavior in individuals. While environmental and social factors may also play a role, studies have shown that genetics can have a significant influence on an individual's propensity towards aggression. Understanding the specific genes involved in aggression may provide insight into potential treatments or interventions for individuals who struggle with aggressive behavior.
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Traits controlled by single genes can be considered simple traits, whereas those that are influenced by multiple genes as well as environment are complex traits. Identify each trait listed below as either simple or complex.
-lactase persistence
-skin color
-height
-sickle-cell anemia
-Tay-Sachs
Answers
Traits controlled by single genes can be considered simple traits, whereas those that are influenced by multiple genes as well as environment are complex traits. From the following options, Simple traits are : lactase persistence, sickle-cell anemia and Tay-Sachs. From the following options, Complex traits are : Skin color and Height.
Each of us is unique. And although we share some characteristics with our peers and family members, each of us has a distinctive set of traits.
Some traits are governed by genes that are passed down from parent to child. Some are acquired through learning. However, the majority of them are influenced by a mixture of genes and environmental factors.
Genes, environmental factors, or a combination of both can influence traits. Qualitative traits (such as eye color) and quantitative traits (such as height or blood pressure)
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I don't know if it is the security guard but what I put if it is wrong please tell me the correct answer.
Answers
The correct option for the function of cell membrane is like "security guard".
Define cell membrane and its functions?All cells have a cell membrane, also known as a plasma membrane, which separates the cell's internal environment from the external environment.
A semipermeable lipid bilayer makes up the cell membrane. The movement of materials into and out of the cell is controlled mostly by cell membrane.A cell is protected by its cell membrane, also known as the plasma membrane. Additionally, it maintains a constant environment inside of the cell, but that membrane serves a variety of purposes. One is to move compounds out of the cell that are harmful as well as nutrients into the cell. Another is that there will be proteins on the cell's membrane, which is its plasma membrane, that interact with some other cells.Thus, the function of cell membrane is like security guard.
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An astronaut is planning a trip to a newly-discovered planet according to the law of universal gravitation, the astronaut weight in the new planet will be greater than his weight on earth if:
Answers
The new planet has more mass than Earth but the same radius. The mass of the astronaut will be calculated by the use of Newton's gravitational equation. The weight of the astronaut depends completely on its mass and the gravitational acceleration of the planet.
Gravitational acceleration is directly proportional to the mass of the planet and indirectly proportional to the radius of the planet. Hence, when the gravitational acceleration increases the planet's mass will increase therefore the radius will decrease. The astronaut's mass will depend on these factors.
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Match the strand with the compliment. 3' - TATAGTCATGCA - 5'
Answers
5' ATATCAGTACGT 3'
AS T is complemntary to A and C is complementary to G
Describe how the water cycle moves water between the tree, the lake, and the sky in the picture below.
Describe one water cycle process you have learned about and tell how it shows that the water cycle
connects nonliving and living things.
Answers
Answer:
Explanation:
The water evaporates from the lake to form a cloud(condensation).it starts to rain(precepation)then collects back in lake.precipitation connects with living things by watering them.it also connects nonliving by processes such as evaporation, precipitation, water returns back into the atmosphere.
Evolution can only be observed Group of answer choices a. in individuals b. over many generations c. within a species d. a
Answers
Evolution can be observed over many generations and within a species (options b and c). The correct answer is option e.
Evolution is a gradual process that occurs over long periods of time, involving changes in inherited traits within a population. While it may not be directly observable within an individual's lifespan, evidence of evolution can be observed by studying populations over many generations.
Observing changes in traits and genetic frequencies within a population over time provides insights into evolutionary processes. This can be seen through the study of fossil records, comparative anatomy, embryology, and molecular genetics, among other methods.
Additionally, evolution can be observed within a species. This refers to the changes that occur in the genetic makeup of a population, leading to the emergence of new traits or variations in existing traits within that species.
Therefore, the correct answer is option e: Evolution can be observed over many generations (b) and within a species (c). By studying populations and their genetic changes over time, scientists can gather evidence and observe the process of evolution.
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Complete question:
Question 27 1 pts Evolution can only be observed
a. in individuals
b. over many generations
c. within a species
d. a & b
e. b&c
Juliet started working with a radioactive substance. In 1997, she started with 200 g. When she measured again in 2002, she had 100 g left. In 2007, she had 50 g.
Which substance is she most likely measuring?
rubidium-91
iodine-131
cobalt-60
carbon-14
Answers
A radioactive substance that Juliet is most likely measuring is known as the cobalt-60. Thus, the correct option for this question is C.
What is a Radioactive substance?A radioactive substance may be defined as a type of substance that significantly radiates as a result of nuclear decay or transition of nuclear energy level, and possesses a specific radioactivity.
Cobalt-60 is a synthetic radioactive isotope of cobalt with having a half-life of approximately 5.2714 years. It is produced artificially in nuclear reactors.
This type of radioactive element is deliberately utilized in industrial production and relies on neutron activation of bulk samples of the monoisotopic and mono Nucleo cobalt isotope.
Therefore, cobalt-60 is a radioactive substance that Juliet is most likely measuring. Thus, the correct option for this question is C.
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which organism is both a primary consumer and a secondary consumer in this web
Answers
Answer:
Omnivores
Explanation:
Omnivores, which feed on both plants and animals, can be considered as being both primary and secondary consumers.
Answer:
An organism cannot serve as both a main consumer and a secondary consumer at the same time in an ecological food web.
Explanation:
A primary consumer, usually referred to as a herbivore, consumes other producers such as plants directly. In a food chain or web, they are located on the second trophic level.
While a secondary consumer feeds on primary consumers. In a food chain or web, they are located on the third trophic level.
Each creature normally resides in a certain trophic level, which indicates its place in the movement of nutrients and energy through the ecosystem. An organism cannot occupy the primary consumer and secondary consumer levels at the same time, even if it can travel up or down the food chain/web by consuming other creatures
So, no organism can serve as both primary consumer and secondary consumer.
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Which of the following phase II metabolic reactions makes phase I metabolites readily excretable in urine?
A. Oxidation.
B. Reduction.
C. Glucuronidation.
D. Hydrolysis.
E. Alcohol dehydrogenation.
Answers
C. Glucuronidation.
Moreover, Phase II reactions consist of the addition of hydrophilic groups to the parent molecule, a toxic intermediate, or a nontoxic metabolite formed in Phase I that requires further transformation to increase its polarity. These reactions include conjugation reactions, glucuronidation, acetylation, and sulfation.
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What is the Producer-Consumer Problem? Where can there be race conditions in this problem?
Answers
The Producer-Consumer race Problem is a well-known synchronisation issue in computer science that includes producers and consumers of different kinds of activities.
What else does the producer-consumer dilemma go by?The producer-consumer problem, often known as the bounded-buffer problem, is a set of computer issues that Edsger W. Dijkstra has been describing since 1965.Unpredictable outcomes and subtle programme errors might occur from race circumstances.
How can I use a monitor to address the Producer-Consumer problem?Employing monitors to address the Producer-Consumer issue. The important portion of a programme is placed within a monitor to accomplish mutual exclusion. The monitor Producer-Consumer contains the producer and consumer's crucial parts in the code.
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Which would be a desirable trait scientists may want to create in a transgenic plant?
Answers
Answer:the ability to resist insects
Explanation:
Usually, the cells are grown in tissue culture before being transformed into plants. The modified DNA will be passed along to the seeds that these plants generate.
What is the purpose of to create transgenic plants?Producing crops with desirable features, excellent quality, and high yield is the core goal of transgenic plant breeding.
In addition to helping the agriculture industry, it has been discovered that the plants can serve as a factory for the manufacturing of pharmaceutical proteins.
DNA is inserted into an organism's genome as part of the GM technology. New DNA is introduced into plant cells to create a GM plant.
Therefore, ability to resist the insect would be a desirable trait scientists may want to create in a transgenic plant.
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Hardwired characteristics of the brain that attempt to keep us in balance by correcting deficiencies are referred to as:
Answers
Hardwired characteristics of the brain that attempt to keep us in balance by correcting deficiencies are referred to as homeostatic mechanisms.
Homeostasis is the body's ability to maintain a stable internal environment despite external changes.
In the context of the brain, homeostatic mechanisms involve various processes that regulate physiological functions and maintain optimal levels of essential substances.
These mechanisms can include feedback loops that detect imbalances and initiate corrective actions.
For example, if there is a deficiency in a particular nutrient or hormone, the brain may activate mechanisms to increase its production, decrease its consumption, or enhance its absorption from the environment.
Homeostatic mechanisms play a crucial role in ensuring the body's overall stability and functioning, helping to maintain proper levels of various substances and promoting overall well-being.
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What would occur if the repressor of an inducible operon were mutated so it could not bind the operator?.
Answers
Answer:
continuous transcription of the operon's genes
Explanation:
A twisted ladder represents a DNA molecule. In this model what are the sides of the ladder
Answers
Answer:
the sides of the ladder are composed of alternating sugar and phosphate molecules. These molecules form the backbone of the DNA molecule. The sugar molecules in DNA are deoxyribose, and the phosphate molecules are part of the DNA's phosphate backbone.
Explanation:
FITB Dweck uses the word ______ to describe the way our beliefs about ability dictate what goals we set for ourselves, what we think we can learn, and ultimately what we do learn. predictability.
Answers
Dweck uses the word predictability to describe the way our beliefs about ability dictate what goals we set for ourselves, what we think we can learn, and ultimately what we do learn.
Relation between predictability and mindset:
The sentence "Dweck uses the word predictability to describe the way our beliefs about ability dictate what goals we set for ourselves, what we think we can learn, and ultimately what we do learn" means that our belief system is responsible for our predictability, which influences the goals we set for ourselves, our knowledge, and what we learn in the end.
What is meant by mindset?
An individual's mindset is a significant predictor of their future success. The belief that our intelligence and abilities may grow and evolve over time and through the application of effort distinguishes a growth mindset from a fixed mindset. A fixed mindset is one in which a person believes that their abilities and talents are set in stone, and no amount of effort or learning can improve them.
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