The lymphatic nodules are compact masses of lymphatic tissue.
Small bean-shaped structures known as lymph nodes are typically less than 2.5 cm long. Throughout the body, they are widely dispersed along the lymphatic routes where they filter the lymph before it is returned to the blood. In the central nervous system, there are no lymph nodes. Lymph nodes often collect in three superficial areas on either side of the body. The inguinal nodes in the groyne, axillary nodes in the armpit, and cervical nodes in the neck are these regions.
A connective tissue capsule surrounds the normal lymph node, which is split into lymph nodules. The lymph nodules are surrounded by lymph sinuses, which are dense collections of lymphocytes and macrophages.
Hence, node are the reservoir of the lymph and immune cell.
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why is the presence of clay particles important in soil? why is the presence of clay particles important in soil? clay particles allow water to percolate through the soil, making oxygen-rich air pockets available. the negative charges on clay bind to positively charged ions, which would be toxic if absorbed by plants. the negative charges on clay bind to positively charged ions and prevent them from leaching. clay particles provide macronutrients-particularly nitrogen, phosphorus, and potassium.
The negative charges on clay bind to positively charged ions and prevent them from leaching. The soil in clays protects nutrients from leaching and reacts with aluminium and hydrogen ions.
Upon degradation, the clay itself might become a source of plant nutrients. This is partially due to the fact that correlative studies have overlooked the intricacies of real clays in soil and that their impacts on bulk soil properties are not well understood. Future studies should focus on these two aspects as well as the development of methods for defining the numerous structural flaws in clays. Because they enable cations to bond, clay soil particles are crucial to soil composition. Because they are negatively charged, cations attach to them, keeping them from washing away and keeping them in the soil. The environment around the plant must contain the required cations to allow for so-called cation exchange.
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Write a testable question that could be used to further investigate the topic of stimulus-response time.
Does muscle memory facilitate quicker reaction times? is a a testable question that could be used to further investigate the topic of stimulus-response time.
Define reaction time.
Reaction time is the amount of time it takes for someone to react to a stimuli. Since it takes time for the information to travel from your hand to your brain, where it is processed, and then a response is started, there may be a brief delay between touching something that is really cold and taking your hand away.
Your arm should be extended as you hold the ruler's top. You should have your fingers on the largest measurement. Ask a buddy to hold the ruler between their fingers with their thumb and index finger placed at the bottom. Drop the ruler, then mark the distance on it where the other person's fingers are. Repeat this for every participant. Allow three tries for each person, then calculate the average.
The individual who reacts most quickly is the one who successfully catches the ruler at its lowest measurement because the sooner the ruler is caught, the less time it has had to fall. Our eyes see that the ruler has been dropped, alerting the brain, which then instructs the arm and hand muscles to grab the ruler. These messages move really swiftly because to our body's advanced intelligence.
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PLS HELP!!!!
Which option best describes a scientific consensus?(1 point)
A. a general agreement among a few scientists that is supported by experimentation and investigation
B. an observation made by a scientist that is supported by experimentation and investigation
C. a general agreement among many scientists that is supported by evidence and reasoning
D. an observation made by a scientist that is supported by evidence and reasoning
_______________________________________________________
How is “lock and key” used to describe the action of enzymes? (1 point)
A. Enzymes are able to create gaps in cell walls that allow products to leave cells.
B. Enzymes have a shape that specifically fits the reactants, like a key in a lock.
C. Enzymes have a shape that specifically fits the reactants, like a key in a lock.
D. Enzymes have a shape that specifically fits the products, like a key in a lock.
The option that best describes a scientific consensus is a general agreement among many scientists that are supported by evidence and reasoning.
The correct option is C.
The lock and key model of enzyme catalysis is described as follows:
Enzymes have a shape that specifically fits the reactants, like a key in a lock.
The correct option is B.
What is a scientific consensus?A scientific consensus is a common agreement about a particular idea or theory that has achieved general acceptance among scientists.
A scientific consensus is arrived at after several corresponding experiments or research on a particular theory or idea by scientists all over the world.
When a scientific consensus is reached, the idea becomes a theory upon which other scientific ideas are based on and used to explain other ideas.
Enzymes are specific in their action and the mechanism of their action has been described using the lock and key model.
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which type of t cell is most likely to promote acute neutrophillic inflammatory responses that defend against extracellular bacteria and fungi?
TH17 type of t-cell is most likely to promote acute neutrophilic inflammatory responses that defend against extracellular bacteria and fungi.
The cytokines IL-1 and TNF, as well as the chemokines IL-8 and IL-17 generated by TH17 cells, all promote the migration of neutrophils into tissues. The most common association between TH1 cells and CTLs, which secrete IFN, and persistent inflammatory infiltrates containing activated macrophages is TH2 cells with eosinophil-rich inflammation. T follicular helper cells aid B cells in germinal center reactions rather than promoting inflammatory responses.
Additional T cells are drawn to inflammatory regions in the vulnerable host through bystander activation or by stimulation with self-antigens produced from inflammatory tissues. Chronic cytokine production causes significant nondeletional T-cell hyporesponsiveness as the inflammatory process intensifies.
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The following is now known about biofeedback as an effective relaxation technique.People can be taught to control their physiological functions, and researchers are still uncertain why biofeedback works. t or f
The following is now known about biofeedback as an effective relaxation technique. People can be taught to control their physiological functions, and researchers are still uncertain why biofeedback works. This is a true statement.
In order to receive information about your body during biofeedback, electrical sensors are connected to you. This feedback enables you to adjust your body subtly to get the desired effects, such as pain relief, by relaxing particular muscles.
The three most popular types of biofeedback are as follows: electromyography (EMG) (EMG) Biofeedback measures the evolution of muscular tension across time. temperature or thermal biofeedback tracks alterations in body temperature over time. Electroencephalography: tracks the evolution of brain wave activity.
Reduce stress, anxiety, sadness, PTSD, and drug/alcohol cravings. Reduce chronic pain, which is a typical symptom of many mental health problems like alcohol and drug abuse, depression, and eating disorders. Reduce hyperarousal and sleeplessness to improve the quality of sleep.
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Which scientist developed the planetary model that stated electrons were found in specific energy levels around the nucleus?
Ernest Rutherford developed the planetary model that stated electrons were found in specific energy levels around the nucleus.
The Rutherford model, also known as the Rutherford atomic model, nuclear atom, or planetary model of the atom, is a description of the structure of atoms that was put out in 1911 by physicist Ernest Rutherford, who took birth in a city of New Zealand. According to the idea, an atom consists of a small, compact, positively charged core called a nucleus, which is where almost all of the mass is concentrated.
The light, negatively charged electrons then orbit the nucleus at a slight distance, much like planets orbit the Sun. Under the guidance of Rutherford and German physicist Hans Geiger in 1909, Ernest Marsden, a student, conducted a series of experiments that revealed the scattering of alpha particles from thin gold foil.
This resulted in the hypothesis that the nucleus was tiny and dense.
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what might be the possible mechanism for the effect of gymnema on the perception of taste
The effect of gymnema on the perception of taste is that it leads to a change in the way an individual will perceive the food.
What is the effect of gymnema on the perception of taste?The term "destroyer of sugar" is the gymmama. Gymnema is now utilized to treat diabetes, metabolic syndrome, obesity, cough, and In addition, it is employed as a diuretic, digestive stimulant, laxative, and antidote for snakebites in addition to treating malaria. Miraculin binds to the receptors for sweetness when taste buds are exposed to it.
Acidic foods that are typically sour in flavor, like citrus, are perceived as sweet as a result. The impact can last up to an hour. Gymnema sylvestre is a taste modulator that prevents sucrose and other sugars from triggering the tongue's sweet receptors. It also effectively illustrates a few key principles of gustatory sensation in a dramatic, trustworthy, and reversible manner.
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if natural fires and herbivores can both reduce the abundance of competitively superior plants, how should this affect the number of other plant species that can persist in the community?
It can cause woody plants to proliferate and outcompete plants that have adapted to fire, reducing the number of plant species that can survive in the community.
Resources are often scarce in a habitat, and many species could compete for them. Plants in a garden, for example, may compete for soil nutrients, water, as well as light. Interspecific competition has a negative overall effect on both species involved. That is, if the other species did not exist, each species would fare better.
Interspecies competition occurs when two species compete for the same limited resource. Both species suffer as a result of competition. The ecological role of a species is defined by the set of conditions, resources, as well as interactions that it requires. According to the competitive exclusion principle, two species cannot coexist if they occupy the same niche.
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what are deep ocaen currents
Deep ocean currents are described as continuous, directed movement of sea water generated by a number of forces acting upon the water, including wind, the Coriolis effect, breaking waves, cabbeling, and temperature and salinity differences.
Where are deep ocean currents?Deep ocean currents generally occur in the higher latitude regions of the Earth, such as North Atlantic Deep Water and Antarctic Bottom Water, and from these frigid poleward regions the deep currents flow at a relatively slow pace towards the equator.
The deep ocean currents play an important role in controlling the climate by moving heat from the equator toward the poles.
They also carry nutrients and food to organisms that live permanently attached in one place, and carry reproductive cells and ocean life to new places.
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sexual selection in a population choose one: a. can lead to physical differences between the males and females of a species. b. does not lead to evolution. c. reduces genetic variation in the population. d. always favors individuals with a higher survival potential.
The right response is option a, which states that morphological distinctions between males and females of a species can result from sexual selection in a population.
The tail of a peacock is a good illustration of partner selection. Peahens choose peacocks with huge, vibrant tails, which allows those peacocks to mate more frequently and produce younger ones. The genes for a long, colourful tail will be passed down from the father to the male peachicks, who will inherit these genes and develop comparable tails. There are two main factors that influence sexual selection. One is the preference of one sex (typically females) for members of the opposite sex who display particular features. The other is higher strength, which (often in males) results in better success in courting females.
So, we can conclude that option a, which claims that sexual selection can lead to physical differences between males and females of a species in a population, is the appropriate response.
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Plants are dependent on water. In most plants, water is absorbed by the roots and then moves up the stem of the plant and into the leaves by capillary action. The tissue responsible for moving the water throughout the plant is
Answer:
The tissue responsible for moving the water throughout the plant is the xylem
cells differentiate according to the chemical environment they are immediately exposed to.T/F
THYMUS. T-cell differentiation occurs within the thymus and is characterized by ordered expression of various CD surface molecules and V, D, and J gene rearrangements.
Gene expression alterations lead to cell differentiation. This happens when various environmental signalling molecules activate or repress certain transcription factors that are required for the expression of particular genes. Environmental variables can also affect cell differentiation and gene expression. For instance, temperature, salinity, and the amount of available nutrients may all affect how an organism's genes are expressed. The Himalayan rabbit's genes that control fur colour are activated and inactivated in response to temperature. Chemicals, extracellular proteins, hormones, and other substances, as well as signals from other cells and the physical environment, converge on the cell, often starting a signalling cascade that results in gene expression. These particular proteins alter the phenotypic to that of a cell that is more specialised.
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Physiological or psychological thinking was given official recognition in the 17th century when the Roman Church officially supported -----.
Physiological or psychological thinking was given official recognition in the 17th century when the Roman Church officially supported Cartesian dualism.
What is Cartesian dualism?The Cartesian dualism the view held by René Descartes that there are two different and incompatible classes of matter in the world. According to Cartesians, the mind is completely distinct from the physical body. The only trustworthy truths are believed to be found in the existence of a metaphysical mind, with sensation and the perception of reality thought to be the sources of falsehood and illusions.
According to René Descartes, who popularized the concept, there are two different types of foundations: mental and physical. According to this philosophy, the mind can exist independently of the body and the body is incapable of thought. In conclusion, ehen the Roman Church formally endorsed Cartesian dualism in the 17th century, physiological or psychological thinking received official recognition.
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(03.03 MC)
The diagram below shows two waves. At which letter (A-D) on the diagram is constructive
interference going to occur?
a
b
c
d
A and C is the letter where constructive interference going to occur.
What is constructive interference?
Constructive interference is a phenomenon that occurs when two waves of the same frequency meet and combine to create a single, larger wave. This larger wave is the result of the two waves amplifying each other due to their identical frequency. When this occurs, the combined wave is larger in magnitude than either of the individual waves. This can be observed when ripples of water come together on a body of water, or sound waves combine to create a louder sound. Constructive interference can also be seen in optics when light waves combine to create a more intense beam of light.
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Answer:c
Explanation:
because the highest point of the graph is c
epidemiologists have specialized expertise directly applicable to policy development. accordingly, which of the statements) about epidemiologists is/are correct?
1. They can provide quantitative evidence for proposed health strategies.
2. Can take an objective approach to data collection
3. Can provide comments on the need for health policy efficacy
Who are epidemiologists?Epidemiologists are on the field assessing disease outbreaks and other potential threats. Epidemiologists, sometimes known as "Disease Detectives," seek out the cause of a disease, identify those who are at risk, and determine ways to control or stop the spread of the disease or prevent it from occurring again. "Disease Detective" training is regularly provided to physicians, veterinarians, biologists, and other health professionals.
What exactly do epidemiologists do?Disease detectives, like investigators at a crime scene, begin by looking for clues. They collect information in a systematic manner, asking questions such as:
Who is sick?What are their signs and symptoms?When did they become ill?Where may they have gotten caught?Epidemiologists study the answers to these questions using statistical analysis to identify how a particular health problem originated.
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where did human waste go before the creation of waste water legislation and waste water treatment plants in new york and elsewhere in the us?
Waste was disposed of through covered up holes in the earth before the creation of waste water legislation and waste water treatment plants
AMRDs and antimicrobials have a substantial point source in WWTPs. WWTPs emit both solid and liquid by-products that can spread AMRDs. They are relatively nutrient-rich, highly contaminated settings that accept waste from a range of AMRD-loaded locations, including hospitals, industrial, and agricultural sites.
A technique called wastewater treatment is used to clean up impurities from wastewater and turn it into an effluent that can be reintroduced to the water cycle. The wastewater is reused or has an acceptable impact on the environment after it is added back into the water cycle (called water reclamation).
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a group of organisms that can breed and produce fertile offspring is known as a ...
A group of organisms that can breed and produce fertile offspring is known as a specise.
A species is a collection of unique organisms that interbreed and give birth to healthy offspring. This definition states that two species are distinct from one another when, in the wild, it is impossible for individuals of the two species to mate and have fruitful offspring.
When a group of organisms can interbreed or exchange DNA and consists of individuals with similar traits, that group of organisms is referred to as a "species." The species, which also functions as a taxonomic rank, is the most fundamental classificational unit in biology. The biological classification system's second taxonomic rank after an individual is called a genus.
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Blood pressure is usually measured in the ________ artery with a sphygmomanometer.
what is the viral envelope, and what does the presence (or absence) of it tell you about the type of virus?
The envelope, which is derived from the host cell membrane, surrounds the viral capsid and serves as just an additional barrier to a external environment. The vast majority of animal viruses are enveloped, whereas the vast majority of viruses that infect plants or bacteria are not.
The viral genome is packaged in a protein coat known as the capsid in virus particles. For some viruses, the capsid is surrounded by a lipid bilayer containing viral proteins, which typically include proteins that allow the virus to bind to host cells. The virus envelope is a lipid and protein structure derived from the host cell membranes. Viral genetic material is contained within protein structures known as capsids.
Viruses are classified into two types: enveloped viruses, which have an outer lipid membrane, and nonenveloped viruses, which do not. The envelope, when present, contains viral proteins that mediate binding to host cells. When there is no envelope, the outer capsid proteins perform this function. Nonenveloped viruses, in general, are more stable and can survive in the environment for much longer. The method of viral entry and exit from host cells is determined by capsids and envelopes.
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Normal cells have a contact inhibition feedback mechanism that prevents the cells
from replicating when other cells are touched. A diagram of cells with contact
inhibition and cells without contact inhibition is shown.
Which statement best describes what will happen to cells in an organism that lack
contact inhibition?
ANSWER CHOICES
The cells will stop replicating once one layer is produced as other body cells will crowd them out.
The cells replicate into the food supply for each cell is used, causing each cell to die
The cells will continue to grow causing a tumor in the body
The cells will replicate normally replacing body cells that die
The statement that best describes what will happen to cells in an organism that lacks contact inhibition is that the cells will continue to grow to cause a tumor in the body.
The correct option is C.
Contact inhibition refers to a process by which cells that are growing when they come in contact with each other will stop the growth of more cells.
Contact inhibition is a form of feedback inhibition mechanism that enables cells to prevent the excessive growth of cells in the body.
Normal cells have a contact inhibition feedback mechanism. However, some cells lack this feedback mechanism of regulation. Hence, the cells have excessive growth resulting in the formation of tumors.
Examples of cells that lack this feedback mechanism of regulation are cancer cells.
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in multiple sclerosis the myelin sheaths around the axons of the brain and spinal cord are damaged and demyelination results. how does this disease manifest at the level of the action potential? i) action potentials move in the opposite direction on the axon. ii) action potentials move more slowly along the axon. iii) no action potentials are transmitted. in multiple sclerosis the myelin sheaths around the axons of the brain and spinal cord are damaged and demyelination results. how does this disease manifest at the level of the action potential? i) action potentials move in the opposite direction on the axon. ii) action potentials move more slowly along the axon. iii) no action potentials are transmitted. only i only ii only iii only ii and iii request answer
This attack causes inflammation and injury to the nerve sheath and ultimately to the surrounding nerve fibers. The process can result in multiple areas of scarring.
When the myelin sheath is damaged, the nerves do not conduct electrical impulses normally. Sometimes nerve fibers are also damaged. If the sheath can be repaired and regenerated, normal nerve function can return. However, if the sheath is severely damaged, the underlying nerve fiber may die. Your bodys immune system produces inflammatory substances that damage myelin and eventually kill the cells, oligodendrocytes, and Schwann cells that produce myelin. Where the myelin is attacked determines your symptoms. The destruction of the myelin sheath is called demyelination. Axonal demyelination leads to an increase in the refractory period for propagation of the action potential. Computer simulations were used to investigate the mechanism by which changes in the passive properties of the internodal membrane increase the refractory period.
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three or more consecutive premature ventricular complexes (pvc) at a rate greater than 100 is called:
Three or more consecutive premature ventricular complexes (pvc) at a rate greater than 100 is called Ventricular tachycardia (VT).
Ventricular tachycardia (V-tach or VT) is a fast heart rate arising from the lower chambers of the heart. Although a few seconds of VT may not result in permanent problems, longer periods are dangerous; and multiple episodes over a short period of time are referred to as an electrical storm. Short periods may occur without symptoms, or present with lightheadedness, palpitations, or chest pain. Ventricular tachycardia may result in ventricular fibrillation (VF) and turn into cardiac arrest. This conversion of the VT into VF is called the degeneration of the VT. It is found initially in about 7% of people in cardiac arrest.
Ventricular tachycardia can occur due to coronary heart disease, aortic stenosis, cardiomyopathy, electrolyte problems, or a heart attack.
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Most of life on Earth depends on which of the following? *
O
animals that eat plants
O photosynthetic organisms
O animals that eat other animals
O consumers on the second trophic level
Answer:
Explanation:
B photosynthetic organisms did the exam good luck
Our sense of taste originally was thought to involve only the following four
sensations
A) sweet, salty, starch, and bitter.
B) salty, fatty, bitter, and sweet.
C) sour, bitter, sweet, and starchy.
D) bitter, sweet, sour, and salty.
E) fruity, fatty, silky, and coarse.
Answer:
D) bitter, sweet, sour, and salty
Explanation:
Our sense of taste originally was thought to involve only the following four sensations: bitter, sweet, sour, and salty. These four sensations are the primary tastes that humans can detect, and they are thought to be the basis of our sense of taste. Other tastes, such as fat and umami (savory), are thought to be detected by other senses, such as touch and smell.
Answer: C
Explanation:
1. What makes Charles Darwin an important person to learn about?
Answer: Charles Darwin is an important person to learn about because he is the scientist who developed the theory of evolution by natural selection. This theory explains how species change over time through the process of natural selection, where individuals with traits that are better suited to their environment are more likely to survive and reproduce.
Darwin's theory of evolution by natural selection has had a profound impact on the scientific understanding of the natural world, and it is considered to be one of the most important scientific theories of all time. It has been supported by a vast body of scientific evidence and has helped to explain a wide range of phenomena in biology, including the diversity of life on Earth and the adaptations of organisms to their environment.
In addition to his contributions to science, Darwin is also an important figure in the history of science. He was one of the first scientists to systematically study and document the process of evolution, and his work laid the foundation for many of the advances that have been made in the field of biology over the past 150 years. His ideas have also had a significant impact on other fields, including psychology, sociology, and anthropology. As such, learning about Charles Darwin and his contributions to science can help us to better understand the natural world and the forces that shape it.
Name a product of cellular respiration that is used as a reactant in photosynthesis? (SC.912.L.18.9)
02
O ATP
Glucose
CO 2
Carbon dioxide is a product of cellular respiration that is used as a reactant in photosynthesis (option 4).
What are the processes of photosynthesis and cellular respiration?Photosynthesis is a metabolic pathway that plants and algae use to generate simple carbs such as glucose by using reactant carbon dioxide, water, and also sunlight.
Conversely, cellular respiration is a series of chemical reactions used by all aerobic cells in order to generate ATP, which is considered the energy coin of the cells. In cellular respiration, the reactants include foods such as glucose molecules and oxygen, while the products of this pathway include carbon dioxide and also the generation of ATP.
Therefore, with this data, we can see that photosynthesis and cellular respiration are different in terms of reactants and products and both metabolic pathways may be considered complementary in terms of the generation and use of substrates.
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Which of the following can lead to cancer?
A. a disruption in the cell cycle
B a cell entering the G0
C. A cell never leaving G0
D. The death of a cell
The option that can lead to cancer is a disruption in the cell cycle (option A).
What causes cancer?Cancer is a disease in which the cells of a tissue undergo uncontrolled (and often rapid) proliferation.
Cell cycle is the life cycle of eukaryotic cells from a quiescent beginning, growth, duplication of DNA followed by mitosis and division. The period of time in the cell cycle when nothing is happening is known as the G0 phase i.e. inactivity.
Cancer is a genetic disorder. It happens when genes that manage cell activity mutate and create abnormal cells that divide and multiply, eventually disrupting how the body works.
Therefore, disruption or alteration in the normal procedure of the cell cycle can lead to cancer.
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4) A hospital in Vienna noted that many of their female patients were dying of "childbed fever" after they had given
birth in the hospital. The rates of this fever were much higher in the hospital than they were for women who had given
birth at a different clinic. In fact, 10% of the women at the hospital contracted fever compared to 4% at the clinic.
Ignatz Semmelweis thought that the fever was being transmitted on the hands of doctors when they went from the
He asked the doctors to wash their hands and the number of cases of "childbed fever"
morgue to examine women.
He also noted that a doctor contracted the same fever after he cut himself with a scalpel that had been
were reduced.
used on an autopsy.
Semmelweis concluded that the fever was caused by some element that could be transferred from person to person.
REASONING: If fever is something that could be transferred from person to person, then...
Answer:
Explanation:
#
if cooking a beef roast with significant amounts of collagen, how can the meat be most effectively tenderized? a.mechanically tenderize meat or cut the collagen from the meat b.use a moist-heat cooking method to change the collagen to gelatin c.slice thinly across the grain of the meat d.roast to rare or medium rare
Option B - Whenever roasting beef that contains a lot of collagen, To make gelatin, cook the collagen using a wet heat method.
At 160/70, collagen begins to break down into gelatin. The meat becomes dryer, but at 160F the collagen-containing connective tissues start to turn into gelatin. Muscle fibers that had been tightly bound start to easily stretch apart over time. The flesh appears more tender because of the succulence that the gelatins produce, despite the fact that the fibers are still very stiff and dry.
Therefore, we want our meat to be cooked tenderly so that the rough collagen is transformed into gelatin while minimizing moisture loss. The fact that these techniques conflict with one another is what makes cooking meat difficult or problematic. However, temperatures must be lower than 130F in order to avoid moisture loss. It takes longer and higher temperatures to transform collagen into gelatin.
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which of the following represents the most likely sequence of the evolution of plants? seedless vascular plants, angiosperms, gymnosperms, bryophytes, charophyceans charophyceans, seedless vascular plants, bryophytes, angiosperms, gymnosperms bryophytes, charophyceans, gymnosperms, seedless vascular plants, angiosperms bryophytes, charophyceans, seedless vascular plants, angiosperms, gymnosperms charophyceans, bryophytes, seedless vascular plants, gymnosperms, angiosperms
Unlike angiosperms, or flowering plants, whose seeds are encased by fully developed , or fruits, gymno, or any vascular plant, reproduce by the use of an exposed seed, or ovule. Many gymnobear their seeds in cones, which are known as " seeds" because they are not visible until they are fully developed.
Tracheophyte predecessors, Rhynia-type plants, Psilophyton, and Gymnosperms are all descendants of chlorophytes. This is the right order. Because they discovered a method of moving materials throughout the plant body, seedless vascular plants achieved a significant advancement in plant evolution. Phloem is used by plants to transport sugars from photosynthesis, and xylem is used to carry water and minerals throughout the plant body. About 420 million years ago, the first vascular plants began to emerge. They most likely descended from bryophyte ancestors that resembled mosses, but their life cycle was dominated by the formation of diploid sporophytes. Early vascular plants changed over time, becoming more like plants in other ways as well.
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