Identify the process by which natural selection acts on Change in Population the surviving insects reproduce. The frequency of resistant insects in the population increases.
Pesticides are any poisonous substances that are employed to kill animals, fungi, or plants and cause financial loss to crops or ornamental plants or pose a risk to domestic animals' or humans' health. A pesticide is used on an insect population. Some insects possess a trait that renders them pesticide resistant. These flies remain. Without the gene, insects perish. Insects that are still alive reproduce. Insects that are resistant are becoming more prevalent. Ecological Change Insecticide is used on a population of them. Choosing Pressure Some insects have a trait that renders them pesticide resistant. These bugs are persistent. Without the gene, insects perish.To learn more about Pesticides.
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The results of Thomas Hunt Morgan’s last cross are shown in the Punnett square below.
Which of Thomas Hunt Morgan's hypotheses was valid based on these results?
White eyes are lethal in female Drosophila.
White eyes are lethal in male Drosophila.
Female Drosophila with white eyes are homozygous recessive.
White eyes are the dominant trait in female Drosophila.
Thomas Hunt Morgan's hypotheses was valid based on these results of White eyes are lethal in male Drosophila.
Morgan's Hypotheses- The gene that determines eye color is located on the X chromosome, Morgan theorized that the first generation of flies in his breeding experiment comprised solely males with white eyes. Due of the white eye trait's location on their lone X chromosome, males exhibited it.
On the other hand, genes on the same chromosome that were more apart from one another were more likely to be split apart during recombination. As a result, Morgan was right when he suggested that the distance between two genes on a chromosome determines how strong a linkage between them is.
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Answer:B
Explanation:
you disrupt all hydrogen bonds in a protein. what level of structure will be preserved? you disrupt all hydrogen bonds in a protein. what level of structure will be preserved? primary structure secondary structure tertiary structure quaternary structure
You disrupt all hydrogen bonds in a protein. Primary structure of structure will be preserved you disrupt all hydrogen bonds in a protein.
Hydrogen bond :A hydrogen bond (or H-bond) is a predominantly electrostatic force of attraction between a hydrogen (H) atom covalently bonded to a more electronegative "donor" atom or group (Dn) and another electronegative atom bearing a lone pair of electrons—the hydrogen bond acceptor (Ac).
What is a hydrogen bond vs covalent?When atoms in a molecule share electrons, they form a covalent connection. An electrostatic attraction between an atom and the positive charge of a hydrogen atom covalently bonded to something else is referred to as a hydrogen bond. It is less strong than a covalent link and can be inter- or intramolecular.
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The innate immune system recognizes double-stranded rna (dsrna), an indicator of viral replication in the host cell, and signals the immune response with?
The innate immune system recognizes double-stranded rna (dsrna), an indicator of viral replication in the host cell, and signals the immune response with interferons.
What are interferons?
A collection of signaling proteins known as interferons are produced and released by host cells in response to the presence of certain viruses. Typically, a virus-infected cell will release interferons, boosting the antiviral defenses of neighboring cells. IFNs are a member of the broad group of proteins known as cytokines, which are employed as a means of intercellular communication to activate the immune system's defenses that aid in the eradication of infections. IFNs also have a number of additional roles, including activating immune cells like natural killer cells and macrophages and boosting host defenses through modulating antigen presentation by raising the expression of MHC antigens.Learn more about the interferons with the help of the given link:
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20pts i need this for an essay.
Think about the role of both biotic and abiotic factors within an ecosystem.
Describe a scenario in which one abiotic or biotic factor is added or removed from an ecosystem.
Explain the possible side effects on that ecosystem.
Be sure to –Address the prompt, provide support, and conclude your thoughts.
Answer:One abiotic factor that could have a side affect on the ecosystem is air.One biotic factor that would have side effect on the ecosystem would be plants.
Explanation:
Which of these properties is the best measure of a star's brightness?
age
size
absolute magnitude
apparent magnitude
According to the statement made, the best measure of a star's luminosity is its apparent magnitude.
The correct option is D.
What is the apparent magnitude?The apparent magnitude m of a star is a number that indicates the luminosity of this star at a great distance from Earth. The scale is "upside down" and logarithmic. Larger magnitudes correspond to dimmer stars.
What is the apparent magnitude of a star?Astronomers determine the luminosity of stars by their apparent magnitude - the star's luminosity from Earth - and absolute magnitude - the star's luminosity at a standard distance of 32, 6 light years or 10 parsecs.
How is apparent magnitude measured?The apparent magnitude of an object, such as a star or galaxy, is the brightness measured by an observer at a particular distance from the object. The smaller the distance between the observer and the object, the greater the apparent brightness.
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A twelve-tone scale, including all the semitones of the octave, is called? diatonic. major. minor. chromatic.
The twelve-tone scale that includes the semitones of the octave is called the chromatic scale.
How to set the chromatic scale?Also called the twelve-tone scale.The notes are interspersed with semitones.It is performed with Western instruments.The chromatic scale is very popular, especially when accompanied by pianos. It is common for it to be used together with diatonic, where one manages to supply the possible flaws of each other.
The chromatic scale is mostly used within music theory and it is rare for concerts or performances to be performed by it, but when this happens we can see the use of piano, violin, and trombone.
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How can an enzyme cofactor needed for a process that is vital to all animals be an essential nutrient (vitamin) for only some?
All creatures need the cofactor, so those that don't need it in their food must be able to make it from other organic molecules.
What is cofactor?A cofactor is a chemical or metallic ion that is not a protein and is necessary for the catalytic function of an enzyme (a catalyst is a substance that increases the rate of a chemical reaction). Cofactors are characterized as "helper molecules" that speed up biological processes. Enzyme kinetics is a field of study that focuses on characterizing the rates at which things occur. In contrast to ligands, cofactors frequently derive their function from staying bound. Inorganic ions and sophisticated organic compounds known as coenzymes are the two main categories of cofactors. In modest levels, coenzymes are mostly derived from organic vitamins and other vital elements.Learn more about the cofactor with the help of the given link:
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Which body membrane protects the body from water loss and harm to internal organs?.
The body membrane that protects the body from water loss and harm to internal organs is called cutaneous membrane.
What is cutaneous membrane?Cutaneous is a term relating to, existing on, or affecting the exterior skin, especially the cutis.
The cutaneous membrane is the technical term for our skin whose primary role is to help protect the rest of the body's tissues and organs from physical damage such as abrasions, chemical and biological damage.
The skin or cutaneous membrane is the outer protective layer of the body of any animal, including of a human.
Therefore, the body membrane that protects the body from water loss and harm to internal organs is called cutaneous membrane.
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In mammals, milk production by mammary glands is controlled by prolactin and prolactin-releasing hormone. Draw a simple sketch of this pathway, including glands, tissues, hormones, routes for hormone movement, and effects.
The correct answer is A hormone produced by the pituitary gland, such as prolactin, travels through the bloodstream of a live organism. The mammary gland is stimulated to release milk by the prolactin hormone.
Milk is a nutrient-rich fluid that comes from a mammal's mammary glands and serves as a strong source of calcium and protein. Cattle, donkeys, bears, goats, buffalo, monkeys, rabbits, sheep, and camels are a few examples of mammals that produce milk.
Water, lactose, protein, fat, and minerals are all present in milk. Milk has a number of health advantages, including improved immunity, healthy teeth, hydration, increased vitamin consumption, energy production, muscle tissue growth, and strong bones.
Prolactin is the endocrinology term for the polypeptide hormone produced by the anterior pituitary gland that is essential for milk production and mammary gland development.
Breast milk production, lactation induction, fetal lung development, osmolarity regulation, and milk protein (casein and lactoalbumin) synthesis are all reliant on the many prolactin actions.
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An mri showed that one of their dorsal roots was severed. how would the patient present upon a neurological examination?
An mri showed that one of their dorsal roots was severed. The patient present upon a neurological examination they would have lost all sensation in the corresponding body part.
The dorsal root :The dorsal root is sensory, and the ventral root is motor; the dorsal root may be absent in the first cervical nerve. The dorsal roots are distinguished by oval swellings known as spinal ganglia. They are made up of nerve cells, which give rise to sensory nerve fibers. The dorsal roots of the spinal nerve are in charge of sensory perception, whereas the ventral roots are in charge of motor control and functioning.
What is ventral root and dorsal root?The dorsal root of the spinal nerve (also known as the posterior root of the spinal nerve or the sensory root) is one of the two "roots" that emerge from the spinal cord. It passes directly from the spinal cord to the dorsal root ganglion. The ventral root and nerve fibers then join to produce a spinal nerve.
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Which of the following is true with respect to oligotrophic lakes and eutrophic lakes? a. Oligotrophic lakes are more subject to oxygen depletion. b. Rates of photosynthesis are lower in eutrophic lakes. c. Eutrophic lakes are richer in nutrients. d. Sediments in oligotrophic lakes contain larger amounts of decomposable organic matter.
The correct option is (c) Eutrophic lakes are richer in nutrients.
Eutrophic lakes feature high concentrations of plant nutrients, such as nitrogen and phosphorus, and therefore sustain high plant productivity.
They are generally more nutrient rich than oligotrophic or mesotrophic lakes. Two times a year, in the spring and the fall, dimictic lakes change. This re-mixes the nutrients and dissolved oxygen that the lake's plants and creatures need. The top water cools and gets denser in the fall than the bottom waters do. The lake water is mixed as the cooler water sinks to the bottom. As the temperature drops in the winter, ice builds up on top of the lake and prevents any more mixing. When the lake is heated by the sun in the spring, the cooler, less dense water rises to the surface while the warmer, denser water sinks. The temperature and density disparities between the upper and bottom water layers grow increasingly pronounced as the summer goes on. In the summer and winter, these lakes typically physically stratify into three discernible strata.Learn more about the Eutrophic lake with the help of the given link:
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What are chemical messengers that diffuse through tissue fluid and affect only nearby cells called?
Chemical messengers that diffuse through tissue fluid and affect only nearby cells are called paracrine.
In the field of science, paracrine can be described as cell signaling molecules that are produced in a cell and affect the nearby cells without having the requirement to be transported through the blood.
As paracrine travel through tissue fluids hence it can induce changes in nearby cells only, unlike the hormones, which travel long distances through the blood. Hence, paracrine is involved in the creation of local action. There are certain receptors and pathway system that is followed by the paracrine in order to cause a reaction in the nearby cells.
Examples of paracrine chemical messengers include growth factors or clotting factors.
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Which layers of a vessel contains collagen fibers with scattered bands of elastic fibers?
Tunica externa are the layers of a vessel containing collagen fibers with scattered bands of elastic fibers.
Every artery and vein has three layers. The tunica intima is the innermost layer. The tunica medium is the muscular middle layer, while the tunica adventitia is the outermost layer. Capillaries have no tunica intima since they are only one cell layer thick.
The tunica externa, also known as the tunica adventitia, is the blood vessel's outermost tunica (layer) that surrounds the tunica medium. It is mostly made of collagen and is supported by an exterior elastic lamina in arteries.
Except for the major arteries, it is the thickest layer. The tunica externa is mostly a connective tissue layer, however it does contain some smooth muscle in veins. Vasoconstriction and vasodilation in vessel walls can have a significant impact on blood flow.
Below is the histological microscopic slide view of Tunica externa.
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Ouabain, a plant substance used in some cultures to poison hunting arrows, disables the sodium-potassium pump. What change in the resting potential would you expect to see if you treated a neuron with ouabain? Explain.
With ouabain, the sodium-potassium pump will be inactivated and thus the concentration of the sodium-potassium gradient would disappear slowly which will result in reducing resting potential greatly.
What is ouabain?A cardiac glycoside called ouabain, which is comparable to the drug digitoxin, is used to treat persistent atrial fibrillation, supraventricular arrhythmias brought on by reentry processes, and congestive heart failure.
As a result of ouabain's inhibition of the Na-K-ATPase membrane pump, intracellular calcium and sodium concentrations rise. Calcium concentrations that are higher inside cells may encourage contractile protein activation (e.g., actin, myosin).
The heart's electrical activity is also affected by ouabain, which reduces the maximum diastolic potential, shortens the action potential duration, and increases the slope of phase 4 depolarization.
Therefore, the loss in activity of the sodium-potassium pump would result in a decrease in its concentration.
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Hodgkin and huxley proposed that sodium was the predominant ion associated with the firing of an action potential because?
Hodgkin and huxley proposed that sodium was the predominant ion associated with the firing of an action potential because the membrane potential approaches the Na+ Nernst potential during the rising phase.
In 1952, Hodgkin and Huxley proposed that sodium was the predominant ion associated with the firing of an action potential. This was based on their observation that the membrane potential approaches the Na+ Nernst potential during the rising phase of the action potential.
Since then, many studies have confirmed that Hodgkin and Huxley were correct in their proposal. Sodium ions play a vital role in the firing of action potentials and are responsible for the fast depolarization phase of the action potential.
Without sodium ions, action potentials would not be able to propagate along axons and nerves would not be able to transmit signals. This discovery has helped to further our understanding of how the nervous system works and has laid the foundation for subsequent research in this field.
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Pancreatic ___________________ is one of the main pancreatic enzymes that digests carbohydrates.
Answer:
amylase
Explanation:
Pancreatic amylase is one of the main pancreatic enzymes that digest carbohydrates.
according to mendel's law of segregation, what is the probablity that a gamete (egg or sperm) from an rr parent carries an r allele?
According to Mendel's law of segregation, 50% is the probability that a gamete (egg or sperm) from an rr parent carries an r allele.
Law of segregation- Each gamete produced by an organism has a single gene copy that is chosen at random. This is referred to as the law of segregation. The genotyping (allele combinations) and phenotypic (observable qualities) of progeny from genetic crossings may be predicted using a Punnett square.
Allele- At a certain genomic region, an allele is one of two or more variations of the DNA sequence (a single base or a segment of nucleotides). For each genomic region with such variation, an organism receives two alleles, each from each parent.
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If an enzyme is inhibited by a substance that binds away from the active site this substance must be?
If an enzyme is inhibited by a substance that binds away from the active site this substance must be an allosteric inhibitor.
What is an allosteric inhibitor?An inhibitor is a substance that prevents an enzyme from acting. The inhibitor may or may not bind to the active site of the enzyme. Hence not all the inhibitors binds to the active site.
If an enzyme is inhibited by a substance that binds away from the active site this substance must be an allosteric inhibitor.
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Explain why a constant rate of increase ( r_Inst ) for a population produces a growth curve that is J-shaped.
A constant rate of increase ( r_Inst ) for a population produces a growth curve that is J-shaped because the population accumulates more new individuals per unit of time,
What does the J curve represent about population growth ?J-shaped development curve A graph curve that depicts the circumstance in which an organism's population density develops fast in an exponential (logarithmic) form in a new habitat, but then abruptly stops due to environmental resistance (e.g. seasonality) or some other factor.
What causes a S shaped logistic growth curve for a population ?When resources are scarce, populations expand logistically. Population increase in logistic growth diminishes as resources become scarce, and ultimately levels off when the carrying capacity of the ecosystem is met, resulting in an S-shaped curve.
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If dehydrogenation reactions were not possible and cells could only carry out basic redox reactions, how would this affect the ability of cells to harness energy from the breakdown of carbohydrates?.
Answer:
Since only one electron can be taken at a time, breaking down carbohydrates to produce energy will probably need more stages.
Explanation:
How does the potential energy connected to chemical bonding alter as a result of redox reactions?
Whenever an electron lost potential energy with the help of the transference in redox processes, it releases energy. When coupled with fewer electronegative atoms (like C or H), electrons possess greater potential energy. Similarly, when linked with an additional electronegative atom, they have much less potential energy. Redox reactions are the more frequent name for oxidation-reduction processes. Because of the transport of electrons, oxidation, and reduction reactions include the simultaneous reduction as well as oxidation of 2 separate molecules. An additional substance is decreased by a reducing agent. A reducing agent undergoes oxidation throughout the process.
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What biological process allows humans, mammals, and birds to maintain high body temperatures?.
The biological processes of endotherms and ectoderms enable mammals, birds, and humans to sustain high body temperatures.
What is a biological process?The processes necessary for an organism to survive and that mold its propensities for interacting with its environment are referred to as biological processes. The persistence and evolution of living forms are made up of several chemical reactions and other phenomena known as biological processes.
Why are biological processes essential to life?They are required to survive. Life processes are the fundamental tasks carried out by an organism. Nutrition, movement, metabolism, respiration, reproduction, and excretion are vital life functions that aid in the upkeep of living things.
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what are the feeding strategies with each ocean zone
Answer:
Suspension feeders and predators
Explanation:
I hope it helps!
What do many of the regulators of complement activation (rcas) that ensure c3b is deposited on the surface of pathogens and not on the surfaces of healthy host cells and tissues contain?
The regulators of complement activation is Complement control protein (CCP) modules
This is further explained below.
What are tissues?Generally, A collection of cells that have a similar structure and work together to perform a certain job is called a tissue.
The gaps in between the cells are filled with an inorganic substance that is referred to as the intercellular matrix. It's possible that certain tissues have a lot of this, while others have very little.
a live cell that has been invaded by an infectious agent or is capable of being invaded by such an agent
The pathogen, in the original and largest use of the word, refers to any organism or agent that might cause illness.
The CCP modules responsible for this are part of the immune system. In addition to "germ," "infectious agent," and "pathogen" are all terms that may be used to describe the same thing.
In the 1880s, researchers studying the complement system coined the word "pathogen."
In conclusion, The complement system is activated by certain components of complement control protein (CCP).
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uniformitarianism allows evolutionary biology to be an experimental science. which of the following are examples of uniformitarianism? group of answer choices members of a natural population of finches that deviate from the norm are identified as monstrosities. observations of erosion on a streambank demonstrate how a canyon was formed. when choosing between competing hypotheses without other evidence, the simplest explanation is usually the most likely. experiments with decomposing animal corpses are used to help explain how fossils form. the development of a fish embryo shows how vertebrates evolved from simpler invertebrates.
Among the most effective instances of uniformitarianism are:
How a canyon was created can be seen from studies of erosion on a streambank. The right answer is therefore b.
The belief that the same natural laws and processes that govern the universe today and have always governed it in the past and apply to all of it is known as uniformitarianism, also known as the Doctrine of Uniformity or the Uniformitarian Principle.
According to the uniformitarian principle, the same processes that change the earth's crust now happened millions of years ago. Additionally, the outcomes of processes today are the same as their outcomes millions of years ago.
A tsunami that reshapes a coastline, a river that floods and deposits mud, a volcanic eruption that causes damage, or an asteroid collision that causes a mass extinction are all suitable examples.
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In Figure 2.7 , if two or more elements are in the same row, what do they have in common? If two or more elements are in the same column, what do they have in common?
The elements in a row all have the same number of electron shells and in same coloumn they have same number of electrons in the outer orbital
What qualities do the members of a group share? Why?Because they all have the same amount of electrons in their outermost shell, or the face they present to the outside world, a set of elements frequently looks and behaves similarly. For instance, the group 18 elements, which are located on the extreme right side of the table, have entirely full outer shells and are infrequently involved in chemical reactions.
So, in same coloumn they have same number of electrons in their valence shell and in same row they have same number of atomic Orbitals.
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A valley is noticeably lower than the surrounding area. What is one way a
valley might form?
A. Continental plates slip past each other.
B. Magma rises at a divergent plate boundary.
C. Basaltic lava flows from cracks in the ground.
D. A stream or a glacier erodes the crust.
According to the research, the correct option is A. Continental plates slip past each other is one way a valley might form.
What is a valley?It is a lowland area with a river course considered a natural channel of the earth's surface.
In this sense, it is one of the most common geographical plain on the earth's surface and can be caused by the movement of tectonic plates that are in continuous movement with respect to each other and generate depressions with shapes that vary in steepness.
Therefore, we can conclude that according to the research, the correct option is A. Continental plates slip past each other is one way a valley might form.
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Microbes were first considered for bioremediation after marjory stephenson observed that they were digesting enormous quantities of waste from a sugar beet factory. the waste was accumulating in:__________
Microbes were first considered for bioremediation after marjory stephenson observed that they were digesting enormous quantities of waste from a sugar beet factory. the waste was accumulating in River water. microorganisms are creatures that are too small to be seen without a microscope, such as bacteria, archaea, and single cell eukaryotes, which are nucleated cells like amoebas .
At times, we also refer to viruses as microorganisms. Despite the truly astounding diversity of microbes, they can all be divided into five major categories: viruses, bacteria, archaea, fungi, and protists. Almost every area of the human body is home to microbes, which can be found on the skin, in the gut, and even up the nose.
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how would living things differ if cell divison took place only for reproduction
Answer:
How would living things differ if cell division took place only for reproduction? All living things would be single celled. How is meiosis related to sexual reproduction? Meiosis produces the sex cells that join to form new offspring during sexual reproduction.
How does human anatomy indicate that our primate ancestors were not strict vegetarians?
The presence of teeth in our mouths and the limited length of our cecum indicate that the digestive systems of our ancestors were not designed specifically for the digestion of plant material.
With the majority of the length in the small intestine and no discernible fermentation chamber, our digestive tract is longer than that of an obligate carnivore but shorter than that of a monogastric herbivore. Our cecum is a vestigial organ. We create pepsin, cannot synthesis B-12 on our own because our ileum serves as its receptor, cannot digest cellulose, have a gastric pH slightly below 2, and do not chew our food in the manner of a cow. Furthermore, meat actually digests more easily than a lot of plant things, far from "rotting" in our intestines.Learn more about the omnivores with the help of the given link:
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Coupled transporters that move solutes in the same direction are called _______.
The coupled transporters that move solutes in the same direction are called symport.
Three means of transport are present in living cells- diffusion, facilitated diffusion, and active transport.
In facilitated diffusion, the movement of solutes occurs through special transport proteins.
These proteins form channels inside them to facilitate the transport of solutes through them.
Depending upon the direction of movement of solutes, facilitated diffusion is further of three types
Symport - In this case, two solutes move together in the same direction.
Antiport - In the case of antiport two solutes move together in the opposite direction.
Uniport - When a solute moves across the membrane independent of the movement of other solutes it is known as uniport.
The conditions mentioned above are represented in the adjoining diagram.
Hence, the coupled transporters that move solutes in the same direction are called symport.
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