Answer:
The only part of the body that has no blood supply is the cornea in the eye. It takes in oxygen directly from the air.
What environmental parameters would need to be monitored as DDTmoves up the food web of an ecosystem?How much DDT is in the ecosystem
DDT is a persistent organic pollutant that is known to move up the food web of an ecosystem when it is released into the environment.
The Impact of DDT on Ecosystems: Monitoring Environmental Parameters Up the Food WebSoil and water levels of DDT and its metabolites.Air quality of the environment.Concentration of DDT in the tissues of top predators.Abundance and diversity of plants, insects, and animals in the food web.Concentrations of DDT in forage and prey items.Concentrations of DDT in the eggs of birds and other species.Reproductive success of species in the food web.Incidence of disease in species in the food web.It is important to monitor the levels of DDT and its metabolites in the soil, water, and air, as well as its concentrations in the tissues of top predators, in order to understand how it moves through the food web and affects the environment.
Additionally, monitoring the abundance and diversity of species, concentrations of DDT in forage and prey items, and concentrations in the eggs of birds and other species can provide important insights into the effects of DDT on the environment.
Finally, it is also important to monitor the reproductive success of species in the food web and the incidences of disease in order to gain an accurate understanding of the impacts of DDT on the environment.
DDT in the ecosystemThe amount of DDT in the ecosystem depends on the amount that has been released into the environment, as well as the rate of its breakdown and transport. DDT levels can be measured in the soil, water, air, and tissues of top predators, as well as in forage and prey items, eggs, and other biota.
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which of these animal taxa has the highest proportion of species threatened with extinction?
The only groups to contain a higher proportion of threatened species are cycads (63% threatened species 5), amphibians (41% 5, 11), corals (33% 5, 21) and conifers (34% 5). Therefore, three of the five most threatened groups assessed to date are plants. By comparison, 25% of mammal species 5, 12 and 13% of bird species are threatened 5.
What type of reaction is burning of fuel releases heat and light?
Combustion is the name for the sort of chemical reaction that occurs when fuel burns, releasing heat and light.
Combustion is a chemical process that takes place between a fuel and an oxidizing agent to create energy, which is often in the form of heat and light. Exergonic or exothermic chemical reactions include combustion.
It is sometimes referred to as burning. Combustion is said to be one of the first chemical processes that humans purposefully regulated. Because the double bond between oxygen atoms in O2 is weaker than single bonds or other double bonds, combustion produces heat.
So, while energy is taken during the reaction, it is released when stronger bonds form to produce carbon dioxide (CO2) and water (H2O). While the fuel contributes to the energy of the reaction, its contribution is minimal in contrast since the energy of the chemical bonds in the fuel is equivalent to the energy of the bonds in the products.
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What is the term for the contractile response of a single muscle fiber to a single muscle impulse?
Twitch is the term for the contractile response of a single muscle fiber to a single muscle impulse.
Twitch is the sudden involuntary movement in the muscle. This happens when the muscle contract on their own. It is also called muscle fasciculation. There are several reason for twitch like: stress, too much caffeine, a poor diet, exercise, or even side effect of some medicines.
Muscles are the loose tissues in the body that mediate the movement of the body parts. They also provide support of the bones. There are three types of muscles in human body: skeletal, cardiac and smooth muscles.
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dna fragments can be separated out by size using gel electrophoesis. what property of dna allows this process to occur?
Because the DNA molecule is negatively charged, an electric field can draw it through the gel. This property of DNA allows this process to occur.
What is gel electrophoresis? Describe how this is used to separate and detect DNA fragments.
The technique of gel electrophoresis is used to separate mixture components according to their sizes. DNA, RNA, or even a combination of proteins could make up the mixture. On the electrophoresis plate, a gel matrix made of a suitable material is spread (for example, agarose gel). A grove in the gel is loaded with the mixture, and an electrical field is then applied to it. Depending on the size and charge of their molecules, the particles in the mixture move away from the initially charged end and toward the oppositely charged end. It has been observed that smaller particles travel more quickly and farther from the initial position.
What is DNA?The molecule that is found inside cells that carries the genetic material necessary for an organism to develop and function. This knowledge can be passed on from one generation to next thanks to DNA molecules.
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the growth hormone axis contains at least one example of a negative feedback loop. t or f
It is true that the growth hormone axis contains at least one example of a negative feedback loop.
What is negative feedback loop?Growth hormone secretion is part of a negative feedback loop involving IGF-I. High blood levels of IGF-I causes decreased secretion of growth hormone by directly suppressing the somatotroph and also by stimulating release of somatostatin from the hypothalamus.
An important example of a negative feedback loop is in control of thyroid hormone secretion. The thyroid hormones that are thyroxine and triiodothyronine are synthesized and secreted by thyroid glands and affects metabolism throughout the body.
Example of biological negative feedback is : Human body temperature.- Hypothalamus of a human responds to temperature fluctuations and also responds accordingly.
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write a comment for this do you agree or disagree and tell me why I think heart disease is so prevalent in the United States because theres a lot of smoking that everyone does out here.Heart disease is the leading cause of death among both men and women in the United States.Also if people will stop smoking or keep there body healthy in United States a lot of people wouldn't be having to worry about heart disease.Heart disease is very important because a lot of things can cause it and people should stop smoking in United States.
Heart disease could be prevalent in the United States but not because people do smoke alot, because there are other factors that can as well result to heart disease apart from smoking.
What are the Cuases of Heart disease?A buildup of fatty plaques in the arteries can be described as one of the common cause of coronary artery disease and this can be regarded as the atherosclerosis, however some of the risk factors that can be attributed to this is the poor diet, lack of exercise as well as obesity and smoking.
It should be noted that the Healthy lifestyle choices can contribute to the decrease in the risk of atherosclerosis however leading risk factors for heart disease can as well be attributed to the high blood pressure as well as the high low-density lipoprotein but one of the common of this is the , smoking as well as unhealthy diet, and physical inactivity.
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deep homology of homeotic genes is also seen in plants. for example, the mads-box genes have been used to work out phylogenetic relationships within flowering species of plants. what was also documented in these studies across many plant lineages?
The MADS-box homeotic genes are also instrumental in nonflowering plant species, where they are involved in developmental pathways in leaf and root systems.
The development of anatomical traits in a range of animals, such as echinoderms, insects, mammals, and plants, is governed by homeotic genes. Homeotic genes typically express transcriptional factor proteins, which have an impact on development by regulating downstream gene networks involved in body patterning. Displaced body parts result from errors in the homeotic genes, such as antennae growing on the fly's back instead of its head. Mutations with ectopic structure-growing are frequently deadly. There are several different subgroups that make up the homeotic gene set. They contain a number of segmentation-related Hox and ParaHox genes. Hox genes are present in all bilateral animals, including Drosophila (where they were first discovered) and humans.
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The small intestine has extensions of what cell part, which helps it absorb more nutrients?.
The small intestine has extensions of the plasma membrane, which helps it absorb more nutrients.
Three sections make up the small intestine: the jejunum, ileum, and duodenum. It aids in the continued digestion of stomach-derived food. In order for the body to utilize the nutrients (vitamins, minerals, carbohydrates, fats, proteins, and water) in food, it absorbs them. The digestive system includes the small intestine.
The mucosal lining of the small intestine is highly specialized for maximizing nutrient digestion and absorption. The lining is extremely folded to form tiny, finger-like projections known as villi. These villi are extensions of the plasma membrane and increase the surface area which aid in absorption.
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regarding gi function, which of the following best describes the actions of atropine? a. atropine enhance the release of gastric juices. b. atropine is a competetive antagonist of cholinergic muscarinic post- synaptic receptors. c. atropine is a competetive antagonist of adrenergic post- synaptic receptors. d. atropine is secreted by chief cells in the stomach.
The simultaneous induction of two second messenger reactions—adenylyl cyclase inhibition, which reduces cAMP accumulation, and stimulation of phospholipase C (PLC), which hydrolyzes phosphoinositides to produce inositol 1,4,5-trisphosphate (InsP3) and diacylglycerol—is a characteristic of mAChR activation in gastrointestinal smooth muscle (DAG). A number of proteins are phosphorylated as a result of IP3 releasing Ca2+ from intracellular reserves and DAG activating protein kinase C (PKC) [1,9,15]. Additionally, intricate reciprocal regulation of second messenger pathways is shown by muscarinic subtypes.
In ileal longitudinal muscles from mAChR-KO and wild-type mice, Sakamoto et al. (2007) [23] investigated the effects of the powerful non-subtype-selective muscarinic agonist carbachol on buildup of cAMP evoked by the -adrenoceptor agonist isoprenaline, which activates adenylyl cyclases. A greater amount of isoprenaline-stimulated cell death was inhibited by carbachol (1 M).
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what term is used to describe a period characterized by very high rates of speciation?
Adaptive radiation is the phrase used to indicate a time when the rate of speciation was extremely high.
A fast growth in the number of species sharing a common ancestor that is marked by high ecological and morphological variety is known as adaptive radiation.
It is fueled by organisms' capacity for ecological adaptation. Adaptive radiation may not necessarily be significant at the scale of the species, but may be significant at a higher taxonomic level, according to Simpson.
Adaptive radiation is the cause of the Galapagos finch variety that was previously explored. It may even be said that their instance is the most well-known and typical adaptive radiation case ever investigated.
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muscular dystrophy (md) is a group of disorders that involve muscle weakness and loss of muscle tissue. duchenne muscular dystrophy (dmd) is a rapidly-worsening form of md. dmd is caused by a defect in the dystrophin gene. the dystrophin protein is a vital part of a protein complex involved in muscle support and structure. dmd is much more common in boys than in girls ( about 1/3500 boys have dmd, girls rarely have dmd). which statements about dmd are accurate? check all that apply.
Summary. An umbrella term for more than 30 hereditary disorders, muscular dystrophy (MD) is. They all contribute to muscular wasting and weakness. Some MD variants develop throughout childhood or adolescence. Others might not show up until their middle years or later.
How is muscular dystrophy contracted?
Muscular dystrophy (MD) typically runs in families. It typically manifests after receiving a defective gene from either one or both parents. MD is brought on by changes (mutations) in the genes in charge of normal muscle structure and function.
Can muscular dystrophy be cured?
Muscular dystrophy (MD) does not yet have a known cure, however a number of treatments can assist manage the condition. The treatment you receive will be personalized for you because different types of MD might lead to rather particular difficulties.
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true or false: the great diversity in the types of antibodies an individual can produce is largely due to each b cell of that individual being able to express antibodies that can bind to a variety of antigenic epitopes.
The answers is False ; In response to pathogens such as bacteria and viruses, our systems produce a diverse range of that may bind to particular antigens.
This is referred to as an antibody's "diversity." The combination of variable regions of H chains and L chains results in antibody diversity.
V(D)J recombination, which involves the shuffling and joining of variable, diversity, joining, and constant region (abbreviated V, D, J, and C, respectively) gene segments, is primarily responsible for variation among B and T cell receptors.
An individual antibody molecule, on the other hand, always has identical light chains and identical heavy chains: an IgG molecule, for example, may have either or light chains, but not both.
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All organisms are composed of
A. diatoms
B. cellulose
C. cells
D. none of the above
Which term best describes a chemical process in which the temperature
increases?
OA. Endothermic
OB. Closed system
C. Combustion
D. Exothermic
Answer: I believe the anser is D( exothermic
Explanation: Exothermic is when the temperature of the reaction mixture increases.
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Animals breathe in air containing oxygen and breathe out air containing less oxygen. The consumed oxygen is used: a. in the glycolysis pathway. b. in the citric acid cycle. c. as an electron acceptor in the respiratory electron transport chain. d. in photosynthesis. e. in the conversion of pyruvate to acetyl Co-A.
The consumed oxygen is used c. as an electron acceptor in the respiratory electron transport chain.
In the field of biology, the electron transport chain can be described as a process where electrons are taken from compounds that are electron donors to compounds that are electron acceptors. The electron transport chain is a series of redox reactions that occur in the mitochondrial matrix.
Animals breath in the air and the consumed oxygen serves as an electron acceptor in the respiratory electron chain process. The consumed oxygen is changed into an ion by accepting two electrons and circulating it via the electron transport chain.
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Drooping of the upper eyelid, and double vision are potential symptoms of damage to the ______ nerve.
Select one:
a. oculomotor
b. trigeminal
c. optic
d. trochlear
e. abducens
Damage to a oculomotor nerve may manifest as double vision and drooping of a upper eyelid.
What in the name of god is speed within physics, and how is it measured?The rate at which a location shifts over time is what constitutes speed. It has a time-based dimension of distance. The Vernier scaling of speed is comprised of the basic units of time and distance. Meters per second (m/s) is the unit of velocity in the metric system.
The definition of speedWhat is speed, exactly? the rate of a directionally changing object's location. The ratio of the length to the time it has taken to travel a distance is known as speed. Speed is in fact a scalar number, having only a direction and no magnitude.
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you are working at a hominin fossil site in east africa when you come across a skull. you note that the brain size is small compared to modern humans, but the canines are nonhoning. additionally, the face seems very flat. to which species does this skull most likely belong?
The skull is most likely to belong to the species of Australopithecus africanus and Australopithecus robustus.
The first was a predecessor of the homo sapiens, the second shared its time on earth with early humans. Among the inscribed locations is the Taung Skull site, where in 1924 the first example of the Australopithecus africanus was discovered.
The oldest fossils date to 3.5 million years ago. The oldest stone tools have been discovered here too, and the oldest evidence of controlled use of fire. Hundreds of specimens of hominids and early humans have been found, these high numbers contribute to the value of these sites.
According to the given conditions, it was noticed that the brain size is small compared to other humans. Also, according to the information hominids were the first ancestors to human and as the evolution took place it increased.
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why are proteins treated with ionic detergent (sds), reducing agents (dtt), and heat before sds-page?
These processes get the protein samples ready for effective gel migration. Large biomolecules and macromolecules known as proteins are made up of one or more extended chains of amino acid residues.
Large biomolecules and macromolecules known as proteins are made up of one or more extended chains of amino acid residues. Among the many tasks that proteins carry out in living things include catalyzing metabolic processes, replicating DNA, reacting to stimuli, giving cells and organisms structure, and moving molecules from one place to another. The primary way that proteins differ from one another is in the order of their amino acids, which is determined by the nucleotide sequence of their genes and typically causes a protein to fold into a certain 3D structure that controls its activity. A polypeptide is an ordered sequence of amino acid residues. At least one lengthy polypeptide is present in every protein. Less than 20–30 residue polypeptides are frequently referred to as peptides and are rarely thought of as proteins. Peptide bonds and nearby amino acid residues hold the individual amino acid residues together. The sequence of a gene, which is encoded in the genetic code, determines the arrangement of amino acid residues in a protein.
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What is the definition of a common ion as it applies to Le Chatelier’s principle?
an ion that is found in a wide variety of compounds
an ion that is present in every sample of pure water
an ion that is found dissolved in most aqueous solutions that are widely used in labs
an ion that is present in an equilibrium system and a compound added to the system
Answer: answer is below
Explanation: Answer: D) an ion that is present in an equilibrium system and a compound added to the systemExplanation: Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.This principle states that if there is any change in a equilibrium reaction, the equilibrium will shift in a direction so as to minimize the effect.Thus when a common ion is introduced to an equilibrium reaction, the equilibrium will shift in a direction where the concentration of common ion is decreasing.For example: In a equilibrium reaction for dissociation of acetic acid:If HCl is introduced wth as common ion.The equilibrium will shift in backward direction where the concentration of is decreasing.
consider a dihybrid cross (aabb x aabb). how many offspring would be predicted to be heterozygous for both traits?
It would be expected that 1 in 4 offspring will be heterozygous for both features.
Based on the gametes of the parents, the checkerboard method is used to identify the potential children from a specific cross. To be able to comprehend all the possibilities kids can be generated, the parents precisely produce the gametes that are placed in a checkerboard pattern. The checkerboard approach can be used to calculate the likelihood of each potential offspring.
The dihybrid parents' homozygous gametes separate. When these gametes combine, the heterozygous progeny is created.
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7.The graph below compares the worldwide population of humans with the number of animal species now extinct.
What is an inference that can be made about the relationship between human population and animal extinctions based on this graph?
Responses
In 1860, less than 10,000 species had gone extinct.
, , In 1860, less than 10,000 species had gone extinct. ,
Human population size increased from 1800 to 2010.
, , Human population size increased from 1800 to 2010. ,
The number of animal extinctions decreased as the population of humans grew.
, , The number of animal extinctions decreased as the population of humans grew. ,
When humans move into new areas, they change the environment, causing animals to go extinct.
Less than 10,000 species had disappeared by 1860.
What is graph?
A graph is a mathematical structure used to represent relationships between objects and their relationships. It consists of nodes, which represent the objects, and edges, which represent the relationships between those objects. Graphs can be used to represent a wide variety of data, from social networks to the physical world. Graphs can also be used to analyze complex data, to find patterns and to predict future outcomes. Graphs can be used to model and solve problems in a variety of fields, such as computer science, business, engineering, and biology.
Less than 10,000 species were extinct in 1860.
Between 1800 and 2010, there were more people on the planet.
Between 1800 and 2010, there was a growth in the human population.
As the human population increased, fewer animals went extinct.
As the human population increased, fewer animals were wiped out.
Animal species become extinct as a result of environmental changes brought about by human settlement in new places.
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anthro which are the most distinctive traits demonstrating the adaptation of neanderthals to cold conditions? group of answer choices their body shape and the length of their arms and legs the retromolar space and heavy wear on their teeth their thick bones with evidence of strong muscles their vertical foreheads and globular shape of the skulls anthro
The most distinctive trait demonstrating the adaptation of Neanderthals to cold conditions is their body shape and the length of their arms and legs.
Thus, the correct answer is A.
Neаnderthаls аre а hominin species thаt existed for аt leаst 200,000 yeаrs throughout Europe аnd western Аsiа, аnd disаppeаred аbout 27,000 yeаrs аgo. During this time, they witnessed some of the coldest climаtic conditions ever known in these regions. Mаny of their physicаl feаtures suggest thаt they were аdаpted for the cold, such аs their bаrrel-shаped chests, shorter limbs, аnd lаrger brаins, аll of which suggest а body shаpe аdаpted for retаining heаt.
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check all that are true statements regarding the effects of the parasympathetic division.
The true statements about effects of the parasympathetic division are:
(1) The lack of divergence in the preganglionic axons prevents the mass activation that is seen in the sympathetic division.
(3) Parasympathetic activity can affect only one group of organs without affecting all other organs.
(4) The parasympathetic division is most active when the body must process nutrients and conserve energy.
Parasympathetic is the type of autonomic nervous system that functions after the body's flight and fight response to calm down the vitals of the body. It relaxes the body and brings it back to its normal state.
Axons are the part of the nerve cells that are elongated in structure. Its function is the carry the signals from one neuron to another. they are very thin in shape.
The given question is incomplete, the complete question is:
Check all that are true statements regarding the effects of the parasympathetic division.
The lack of divergence in the preganglionic axons prevents the mass activation that is seen in the sympathetic division.The effects of the parasympathetic division tend to be widespread. Parasympathetic activity can affect only one group of organs without affecting all other organs.The parasympathetic division is most active when the body must process nutrients and conserve energy.To know more about parasympathetic, here
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a shark eats a penguin that has recently been feeding on some krill. the penguin has 100 joules worth of energy, but the shark ultimately gains only about 10 joules. where does the rest of the energy go? (2 points)
Answer: answer below
Explanation: A shark eats a penguin that has recently been feeding on some krill. The penguin has 100 joules worth of energy, but the shark ultimately gains only about 10 joules. Where does the rest of the energy go? It is used for cell functions or transformed to heat energy.
What is the importance of positive parent involvement regarding sexuality?
The important is that sexuality is in the Parental tracking is the attention and supervision in their offspring's behavior.
Well-monitored teenagers document much less sexual activity, fewer sexual partners, and expanded use in comparison to poorly-monitored adolescents. Parent involvement motivates kids to learn, main to better grades.
The stage of involvement is critical in generating a excessive effect at the student's performance. The better the diploma of parental involvement, the better the effect at the toddler's educational achievement. Research has discovered that properly determine-toddler communique round sexuality has many effective results for teens – inclusive of assisting them defend their personal sexual health.
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Archaeologists discovered a new set of mummies in egypt with what unique feature?
Numerous mummies were discovered during the excavations, some of which had a golden tongue or amulet inserted into the mouth of the corpse. This custom was designed to ensure that the deceased could speak in front of the court of the Ancient Egyptian god Osiris and converse in the hereafter.
What did researchers find in Egypt?
4,300-Foot Tunnel Under Ancient Egyptian Temple Found by Archaeologists At Taposiris Magna, a temple to the deity of death Osiris, archaeologists in Egypt found an underground tunnel.
What recent archaeological find took place in Egypt?
The pyramid of an unidentified ancient Egyptian queen has been discovered in Egypt, together with a trove of coffins, mummies, antiques, and a network of connected tunnels. It was located next to King Tut's tomb in the historic necropolis Saqqara in Giza, which is only 20 miles south of Cairo.
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RNA polymerase adds ribonucleotides onto the _____ end of a growing rna by forming _____ bonds.
In order to create an RNA-DNA hybrid of around 8 base pairs in length, RNA polymerase is able to add ribonucleotides that are complementary to the DNA sense strand as the DNA is unwound. As RNA polymerase catalyses the production of phosphodiester bonds between the ribonucleotides, a developing RNA chain is generated.
Does the 3 end get added to by RNA polymerase?
RNA polymerase, which creates a complementary strand of RNA using a single-stranded DNA template, is the primary enzyme involved in transcription. Each new nucleotide is added to the 3' end of the strand as RNA polymerase constructs an RNA strand in the 5' to 3' orientation.
Do ribonucleotides get added by RNA polymerase?
Based on complementary base pairing, RNA Polymerase adds ribonucleotides to the template strand to produce an mRNA. The promoter region of the DNA strand is where the sigma protein initially breaks apart the double helix. The RNA polymerase then passes the DNA template strand through it.
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Without buying points, a monthly mortgage payment will be $1,250. buying 1 point at closing would reduce the payment to $1,236. to the nearest year, how long would it take to break even by buying 1 point, with a $100,000 mortgage?
a. 5 years
b. 6 years
c. 7 years
d. 8 years
please select the best answer from the choices provided a b c d
It would take b. 6 years to break even by buying 1 point, with a $100,000.
The point at which total expenses and revenues are equal, or "even," is known as the break-even point. Even though opportunity costs have been paid and capital has received the risk-adjusted, expected return, there is no net loss or gain and one has "broken even."
how to figure out what break even is.
The information indicates that the mortgage payment will be $1,250 per month. The closing cost would be $1,236 if one point were bought.
The time taken will be:
Monthly savings = 4250/1236 = 14
Time taken = 7
1000/14 = 71.4 months= 6 years
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a specialized plasmid vector that has an e.coli promoter upstream of a restriction site into which foreign genes can be inserted is known as a:_____.
A specialized plasmid vector that has an e.coli promoter upstream of a restriction site into which foreign genes can be inserted is known as a expression vector.
What kind of gene transfer is employed by E. coli?Recombination through horizontal gene transfer (HGT) has been identified as a crucial element in the long-term evolution of the E. coli genome, however it is still unclear how much HGT causes sequence divergence in comparison to mutations (6).Place DNA (more...) An suitable restriction site in the plasmid vector is ligated to a segment of the insert DNA, which is then utilized to convert E. coli with the recombinant molecule. They choose colonies with plasmid DNA that are antibiotic-resistant. A fundamental molecular biology approach is the heat shock method of transforming plasmid DNA into E. coli. It involves putting an alien plasmid or ligation product inside of bacteria.To learn more about E. coli genome refer to:
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