The four groups of pathogenic E.coli are enteropathogenic, enterotoxigenic, verocytotoxigenic and enteroinvasive groups. These groups can best be isolated and recoved through luria broth.
What is Escherichia coli?The pathogenic E. coli or Escherichia coli serotypes are grouped on the basis of their mechanism of causing symptoms in humans. The six groups of pathogenic E.coli are enteropathogenic, enterotoxigenic, verocytotoxigenic, enteroinvasive, enteroaggregative and diffusely adherent E. coli.
Luria broth (LB) is one of the most commonly used growth medium for E. coli. It promotes fast growth of the organism and also provides good plasmid yields, making it an excellent choice for most laboratory applications, especially the small-scale plasmid preps.
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the symbols for the nitrogen
atoms, N, is shown. What atom
besides N do you think forms the
rings that make up the bases?
O Carbon
O Oxygen
O Phosphorus
O Sulfur
HELP IM ON LIMITED TIME
A scientist compares the bone structure of the monkey arm to that of
the bat wing, and observes that the same bones are present in each
animal, but with variations in thickness, length, and shape. What
evidence of evolution is this an example of?
Select one:
DNA
Molecular
Embryological
Homologous structures
Answer:
homologous structures.
Explanation:
This evidence of evolution is an example of homologous structures. Homologous structures are structures in different species that have a similar underlying structure and are thought to have evolved from a common ancestor. In this case, the scientist is observing that the bones in the monkey arm and the bat wing are similar, but with variations in their characteristics. This suggests that these structures evolved from a common ancestor, providing evidence for the theory of evolution.
what major part of the food chain is more or less missing from the galapagos island
The part of food chain which is more or less missing from the galapagos island are the bacteria.
How bacteria are missing in galapagos island food chainFood chain simply refers to those networks of food web system transferring energy from the producers and ending at the decomposers.
That being said, the bacteria are microscopic decomposers which are missing in the food chain of the galapagos island. It shows the relationship between organisms as to who eats whom and to avoid a crash on the population.
In conclusion, we can now confirm from above that food chain shows how living organisms are related or connected with each other.
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the place where light is brought into focus (to form an image) in the human eye is called the the place where light is brought into focus (to form an image) in the human eye is called the lens. optic nerve. pupil. retina. cornea.
Together with the cornea, the lens helps to properly focus light on the retina.
What is the quiz question about how light travels via the eye?The cornea lets light through, which bends it. 2 The iris's pupil allows light to freely flow through. Vitreous humor allows for the passage of light. 4) The retina absorbs light rays and transforms them into impulses.
How does light enter the eye?It initially penetrates the cornea, where a small amount of light is refracted. The aqueous humor, a clear liquid, is the next medium through which the light travels. It passes through the pupil, which is encircled by the iris, the colored portion of the eye that regulates how much light enters the eye.
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Which of the following mechanisms uses high-velocity microprojectiles, coated with DNA, to produce a transgenic plant?
A. Agrobacterium tumefaciens
B. electroporation
C. microinjection
D. biolistic gene transfer
E. None of the answers are correct.
In order to create a transgenic plant, biolistic gene transfer techniques employ high-velocity microprojectiles coated with DNA. (Selection D)
What is DNA, and how does it work?The biological blueprints that distinguish each species are found in a molecule called deoxyribonucleic acid (DNA). DNA is transferred from adult organisms to their progeny during reproduction, along with the instructions it contains.
Why do humans possess DNA?Genes, which make up DNA and are the foundation of all life. DNA's capacity to repeatedly duplicate itself is its most significant property. When cells divide, when parents give genetic information to their children, and when RNA (ribonucleic acid) is used to code for proteins, DNA must be duplicated.
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the strongest line of attack against the response chain approach to movement sequencing is based on evidence for the existence of these
Based on evidence supporting the existence of various motor programs, the response chain approach to movement sequencing is most strongly defended.
What stroke preventive strategy is the most successful?The greatest strategy to reduce your risk of having a stroke is to eat a nutritious diet, exercise frequently, quit smoking, and drink in moderation. By making these lifestyle adjustments, you can lower your chance of issues like fatty substance buildup in your arteries (atherosclerosis).
How should a stroke patient be transported?When there are significant distances involved, air transport is preferred to ground ambulance transport. Air transport expedites the process and enables patients to receive better care than may be offered locally.
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The large Oldowan stone tool assemblages in the archaeological record of East Africa have been determined to represent what?
a) cache sites for stone tools
b) hunting blinds
c) areas in which raw materials to make stone tools was mined from the ground
d) home bases where females and their infants slept
The large Oldowan stone tool assemblages in the archaeological record of East Africa have been determined to represent areas in which raw materials to make stone tools was mined from the ground and is therefore denoted as option C.
What is Oldowan stone tool?This is referred to as a widespread stone tool archaeological industry in prehistory which served as a quarrying site.
The Oldowan stone tool assemblages were composed of pebbles of quartz, quartzite, or basalt etc which denotes that the stone tools were mined in the East Africa area and is therefore the reason why option C was chosen as the correct choice in this scenario.
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identify the fluid filled space between the cornea and iris. view available hint(s)for part a identify the fluid filled space between the cornea and iris. posterior segment anterior chamber posterior chamber anterior segment
The anterior chamber is the fluid filled space between the cornea and iris.
What are the main fluids in eye ?The area between the cornea and iris known as the anterior chamber is filled with fluid. The clear, watery fluid called aqueous humour lies between the cornea and the anterior vitreous.
A clear liquid called aqueous humour fills the space between the lens and cornea. The liquid bathes and nourishes the lens while preserving eye pressure.
The vitreous humor, also referred to as vitreous fluid, is a clear, colourless gel-like substance that fills the space in the eye between the lens and the retina.
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The tops of bulb-producing plants should be allowed to continue growing until they die naturally because
A) they add beauty to the flower garden
B) they continue to manufacture food for storage in the bulb
C) they grow larger and provide good mulch for the bulbs
D) They shade the bulbs and keep them cool
The tops of bulb-producing plants should be allowed to continue growing until they die naturally because (B) they continue to manufacture food for storage in the bulb.
Geophytes are plants that produce tubers, corms, bulbs, and other subterranean storage organs. Some epiphytic orchids (Orchidaceae family) produce pseudobulbs, which look superficially like bulbs and are above-ground storage organs.
Amaryllis, Crinum, Hippeastrum, Narcissus, and numerous other members of the amaryllis family Amaryllidaceae are among the almost all monocotyledon plants that produce real bulbs. Members of the Amaryllid subfamily Allioideae that fall within this category include onion, garlic, and other alliums.
A huge bulb can sprout from a small one. Renewal bulbs are small, medium-sized bulbs that grow to take the place of the original bulb. Increase bulbs are little bulbs that form on each of a bulb's leaves or on the ends of short subterranean stems that link to the parent bulb.
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How is the structure of a fat cell related to its function of storing fat for later use?
Answer:
Explanation:aaaaaa
in mice, and other mammals, black fur is dominant to brown fur. one gene assigns the color, while another gene deposits the pigment in the fur.
Both a dominant black pigmentation and a hereditary brown pigment can be produced by a different gene that is not connected to the agouti gene.
A gene example is what?Many of your characteristics, like your skin and hair colours, are determined by genes that are handed down to you. Perhaps Emma inherited the red hair gene from her mother, who contains the both brown and red haired genes. If her father possesses two red hair genes, then developing red hair could have a hereditary foundation.
What could make a gene useful?The main structure and function component of inheritance is a genome.. Genes are made out of DNA. However, a large part of genomes lack protein coding.
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Ardipithecus ramidus can be described as:
a) possessing thin tooth enamel
b) lacking any knuckle-walking adaptations
c) human-like lower limb proportions
d) lack of a canine diastema
Answer: All of the following statements are true about Ardipithecus ramidus:
a) possessing thin tooth enamel
b) lacking any knuckle-walking adaptations
c) human-like lower limb proportions
d) lack of a canine diastema
Ardipithecus ramidus is an early hominid species that lived about 4.4 million years ago in Africa. It is considered to be one of the oldest known hominids and is considered a key transitional species between apes and humans. Some of the characteristics that distinguish Ardipithecus ramidus from other hominids and apes include thin tooth enamel, lack of knuckle-walking adaptations, human-like lower limb proportions, and a lack of a canine diastema (a space between the upper canine tooth and the incisor tooth). These features suggest that Ardipithecus ramidus was a bipedal species that may have had some degree of social complexity and may have used tools.
What will it cost to carpet a room 12 feet wide and 15 feet long if carpet costs $20.80 per square yard?
a. $334.60
b. $374.40
c. $416.00
d. $504.60
e. $560.00
Option C, The carpet for the room will cost $416.00.
First, we have to Convert the feet to yards first.
12 feet = 4 yards
15 feet = 5 yards
4 yards x 5 yards = 20 square yards.
To calculate this we have a formula:
c=(converted square yards)x(Given cost)
The price is (20 square yards) x ($20.80 per square yard) = $416.00
If you don't convert the feet to yards first, make sure to be very careful with the number of square feet.
12 feet x 15 feet = 180 square feet.
Trying to convert to square yards by dividing by 3 will give you 60 foot-yards, which isn't right, so you have to divide by 3 again to get 20 square yards (i.e there are 9 square feet in a square yard).
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The tryptophan operon in some bacteria is a repressible operon. Which of the following statements correctly describes this operon?
A) It is permanently active.
B) It is activated only when tryptophan is present in the growth medium.
C) It is activated only when glucose is present in the growth medium.
D) It is deactivated whenever tryptophan is added to the growth medium.
The statement describing the operon is D. It is deactivated whenever tryptophan is added to the growth medium.
Operons are groups of structural genes that are expressed in a coordinated manner and are simultaneously under the control of a single regulatory signal. This makes the process of genetic expression in cells more efficient because nerve disorders are involved in the same series of metabolic reactions.
Some prokaryotes use the tryptophan operon system to control gene expression. In the tryptophan operon, the operons are transcribed together to code for components required in the production of the amino acid tryptophan. The mechanism of this operation is controlled by suppression of the end products of expression and attenuation. In some bacteria, controlling gene expression uses negative control involving the activity of a regulatory gene. This operon will be deactivated whenever tryptophan is added to the growth medium so that the process of genetic expression in cells is more efficient.
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A student measures the length of a root growing from a sprouted seed. What
determines whether the measurement is precise?
O
A. A precise measurement can be repeated multiple times.
B. A precise measurement is displayed in the largest possible units.
C. A precise measurement contains the fewest significant figures.
D. A precise measurement is close to the actual value.
A precise measurement can be repeated multiple times. The correct option is A.
What is precise measurement?Precision, also known as reproducibility or repeatability, is the extent to which repeated measurements under identical conditions yield the same results.
Precision is determined by standard deviation, which is the amount and frequency with which measurements differ. If a standard deviation is high, then it suggests low precision.
A student measures the length of a sprouted seed's root. A precise measurement can be repeated as many times as necessary.
Thus, the correct option is A.
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Which of the following occurs during apoptosis?
(A) lysis of the cell
(B) direct contact between signaling cells
(C) fragmentation of the DNA
(D) release of proteases outside the cell
The correct option is D : Fragmentation of the DNA ; The splitting or breaking of DNA strands into bits is known as DNA fragmentation. It can be done purposely by laboratory people or cells, or it might happen accidentally.
Spontaneous or inadvertent DNA fragmentation is the accumulation of fragments in a cell over time.
Blebbing, cell shrinkage, nuclear fragmentation, and DNA fragmentation are all signs of apoptosis.
Apoptotic cells, in contrast to necrosis, create apoptotic bodies that are phagocytized by surrounding cells without the loss of cellular contents.
Caspases, proteolytic enzymes that cause cell death by cleaving particular proteins in the cytoplasm and nucleus, induce apoptosis.
Caspases exist as inactive precursors, or procaspases, in all cells, and are normally triggered by cleavage by other caspases, resulting in a proteolytic caspase cascade.
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Read the statement.
Scientists have discovered that climate change is causing many animals to migrate from their local habitats in order to reach colder areas and survive.
Which of the following is a way that humans can help support the survival of animals as they make their migrations?
Put up additional fencing along borders.
Allow for regulated hunting on state-owned properties.
Install land bridges or wildlife overpasses across roads.
Require new housing developments to be “green.”
Installing land bridges or wildlife overpasses across roads helps in supporting the survival of animals as they make their migration. Thus, the correct option is C.
What causes migration of animals?Animal migration is the large-scale movement of an animal species from one place to another place. Most species migrate during a particular season in search of food, water, or for mating reasons when conditions are not favorable in their native environment.
Animals can cross large areas through the land bridges or wildlife overpasses which are built across roads. This can be worse as it subdivides animal population and fragment their habitats. This results into losing access to large areas of their living space which makes it much harder for many woodland creatures to forage for food, find mates and carry on their genetic legacies.
Therefore, the correct option is C.
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cracking the codon . picture below
The process of protein synthesis is as follows:
Original DNA sequence - GGC GAG AAT GAA ACT ATT TGT AGCReplicated DNA sequence - CCG CTC TTA CTT TGA TAA ACA TCGTranscripted RNA sequence - GGC GAG AAU GAA ACU AUU UGU AGCMystery message - Gly Glu Asn Glu Thr Ile Cys SerWhat are codons?Codons are triplets of nucleotides that are present on an mRNA molecule that code for specific amino acids.
The codons present in mRNA are complementary to the anticodons present in tRNA molecules.
During the process of protein synthesis from the genes present in the DNA, the processes involved are:
replication - copies of the DNA are made from the DNA strand.transcription - the DNA template strand is used to make mRNA moleculetranslation - the mRNA molecules are used to make proteins in the ribosomes.Learn more about protein synthesis at: https://brainly.com/question/13022587
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When naming a compound with two elements, the ending of the second element is changed to.
A. -ion
B. -ine
C. -ide
D. -ade
Answer:
C. -ide
Explanation:
Example: Sodium+chlorine turns into Sodium-chloride
the phosphorolytic cleavage of glycogen is energetically advantageous because the released sugar is already ____
The phosphorolytic cleavage of glycogen is energetically advantageous because the released sugar is already phosphorylated so we do not need and ATP molecule to allow for phosphorylation.
In its cleavage reaction, glycogen phosphorylase uses a phosphate molecule, connecting it to the sugar as it is released. A second enzyme, phosphoglucomutase, then shifts the position of the phosphate to a neighboring carbon atom in the sugar, making the sugar ready for breakdown by glycolysis.
Thereby, glucose can be obtained from glycogen. Glycogen phosphorylase causes phosphoroclastic cleavage into glycogen, and produces glycogen-1-phosphate.
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Question 1-6
The Artic tundra has an annual temperature range of -34° C to 12° C. Annual precipitation ranges from 15 cm to 25 cm.
Based on these conditions, what characteristic does the Arctic tundra exhibit
O high nutrients
Olow biodiversity
long growing season
small population changes
Answer:Low biodiversity
Explanation:
What happens when an organism has
low fitness?
A. It runs the fastest.
B. It has many offspring.
C. It eats well.
D. It struggles to survive.
Answer: D
Explanation:
briefly describe the path of blood as it circulates through the heart
In radishes the shape may be long or round or oval. The color may be red or white or purple. A long red variety was crossed with a round white variety. The F1 were all oval purple. In the F2 the following results were obtained: 8 long red, 15 long purple, 17 oval red, 31 oval purple, 7 long white, 15 oval white, 8 round red, 16 round purple, 9 round white. What is the genetic basis for these characters?
Genetic traits are passed down through the generations as genes, which are DNA molecules that contain the instructions for each trait.
What does "genetic basis" mean?The term "genetic foundation of common disease" refers to the degree to which a person's individual risk of contracting a particular common disease is influenced either by hereditary material she or he inherited at conception.
What constitutes heredity's genetic foundation?The fundamental unit of life is the gene, which is a hereditary unit. Until they are passed from parents to children and from to the next generation during sexual reproduction, genes are hereditary units. Due to the gene contained in the chromosomes, we inherit genotypic and phenotypic traits from our parents.
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Retroviruses, such as the human immunodeficiency virus (HIV), carry their genetic information as RNA and convert it to DNA using the enzyme
A. DNA polymerase II.
B. retrograde polymerase.
C. RNA to DNA polymerase.
D. reverse transcriptase.
RT is referred to as Hiv infection (HIV) and other retroviruses carry their genetic material in the form of RNA, which is then converted to DNA by an enzyme.
What kinds of viruses fall under the retrovirus classification?There are two more retroviruses that can harm humans in addition to the one that causes AIDS, the human immunodeficiency virus (HIV). The first one is referred to as human T-lymphotropic viruses type 1 (HTLV-1), and the second one is referred to as human M o virus type 2. (HTLV-II).
what are The four retroviruses ?Oncoviruses, Lentiviruses, or Spumaviruses make up the three families of retroviruses. A-type, A and, C-type, and D-type retroviruses are categorized as well depending on how they appear under an electron microscope.
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Quick breads include items such as pancakes, waffles, biscuits, scones, _____, coffee cakes, cornbreads, flatbreads, and banana nut bread.
Quick breads include items such as pancakes, waffles, biscuits, scones, _cream puffs____, coffee cakes, cornbreads, flatbreads, and banana nut bread.
What are quick breads ?Quick breads are bread-like goods that use baking powder and baking soda in place of yeast to leaven them.
Three varieties of fast breads exist:
Pour batters: These can be "poured" directly from the mixing bowl due to their thin nature. Batter drops: need to be scraped into the baking pan from the bowl because they are very thick.
A soft dough is one that can be rolled and shaped by hand.
Quick breads are rather self-explanatory; they are so named because they can be prepared quickly. Coffeecakes and quick bread loaves employ baking soda or powder as leavening agents and need little to no kneading. Flavorings include fruits, nuts, cereals, vegetables, and spices.
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. Given the brain size and pelvic dimensions of Homo erectus, their infants were likely:
b) physically active at birth
c) altricial (helpless at birth)
d) large brained
e) were strong enough to grasp onto their mothers
(C) Given the brain size and pelvic dimensions of Homo erectus, their infants were likely altricial (helpless at birth)
what is Homo erectus?This is a type of extinct human that existed between 1.6 million and 250,000 years ago, during the Pleistocene Epoch. Homo erectus was the first human species to have a flat face, a prominent nose, and probably scant body hair coverage. It also possessed a more contemporary gait and body proportions.
what is altricial ?This can simply mean a being hatched, born, or having young that are hatched, born, or having young that are hatched, born, in a very immature and defenseless condition, requiring care for a while.
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The first step in the replication of dna is catalyzed by . primase helicase dna polymerase single-strand binding protein ligase
The first step in the replication of DNA is catalyzed by the enzyme DNA helicase. The primary action of this enzyme is to unwind the section of the double-stranded DNA that will be replicated.
Helicases are a type of enzyme that is regarded to be essential to all life. Their primary role is to unpack the genetic material of an organism. Helicases are motor proteins that use ATP hydrolysis to travel directionally along a nucleic acid phosphodiester backbone, separating two hybridized nucleic acid strands.
DNA helicases catalyze the dissolution of the hydrogen bonds that connect the two strands of double-stranded DNA. This energy-demanding unwinding reaction produces single-stranded DNA, which is used as a template or reaction intermediate in DNA replication, repair, and recombination.
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What are some ways to assess the strengths and weaknesses of a graph/chart
Answer:
When assessing the strengths and weaknesses of a graph or chart, there are several key factors to consider.
Firstly, the accuracy of the data presented should be evaluated. The data should be checked for any errors or discrepancies, and the source of the data should be verified. Additionally, the data should be relevant to the topic being discussed, and should be up-to-date.
The visual presentation of the graph or chart should also be taken into account. The graph should be easy to read and interpret, with a clear title, labels, and legend. The graph should also use appropriate scales, and the axes should be labeled correctly.
The type of graph or chart should also be considered. Different types of graphs and charts are better suited to different types of data. For example, a bar graph is better suited to comparing categorical data, while a line graph is better suited to showing trends over time.
Finally, the graph or chart should be compared to other graphs or charts on the same topic. This will help to identify any potential discrepancies or inaccuracies in the data.
Overall, assessing the strengths and weaknesses of a graph or chart requires careful consideration of the accuracy of the data, the visual presentation, the type of graph or chart, and comparison to other graphs or charts on the same topic.
which of the following receptor detects pain sensations? which of the following receptor detects pain sensations? free nerve endings lamellated corpuscle meissner's corpuscle merkel discs
The skin's free nerve endings, known as nociceptors, have a high threshold for mechanical, chemical, or thermal stimuli and respond only when the strength of these stimuli is high enough to cause tissue injury. The input from these receptors is perceived as pain.
Which of the following receptors senses pain?Nociceptors are sensory receptors that detect signals from damaged tissue or the danger of injury, as well as substances generated by the damaged tissue. Nociceptors are free (bare) nerve terminals present in the skin, muscle, joints, bone, and viscera .
Meissner corpuscles respond to skin indentations of less than 10 micrometres and are especially sensitive to low-frequency vibrations ranging from 10 to 50 Hertz.
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