true/false. when dna is replicated or copied the ladder splits as the bases separate. new units are added to each half of the dna molecules

The best describes how a scientist could accurately study the effects of soil buffering on plant growth in a region that is affected by acid deposition downwind of a coal-burning power plant is measuring the changes in plant height over a year in two different groups of trees the same distance from the power plant; one group is in topsoil and one group is in topsoil with limestone added.

Thus, the correct answer is A.

Аcid rаin is one of the iconic environmentаl problems of the postindustriаl аge. Cаused primаrily by pollution from coаl-burning power plаnts, the deposition of strong аcids in precipitаtion hаs led to degrаdаtion of terrestriаl аnd аquаtic ecosystems аcross eаstern North Аmericа аnd western Europe.

To study the effects of soil buffering on plant growth in a region that is affected by acid deposition downwind of a coal-burning power plant, a scientist must measure the changes in plant height over a year in two different groups of trees the same distance from the power plant; one group is in topsoil and one group is in topsoil with limestone added.

Your options are incomplete, but most probably your full options can be seen in the Attachment.

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Answer: Lakes and freshwater rivers

Explanation: While about 96.5 percent of Earth's water is salt water found in oceans and seas, there are freshwater sources that make up a small percentage of Earth's water.  Freshwater is essential for life and is found in lakes, rivers, and underground aquifers.

Lakes are large bodies of freshwater that are surrounded by land.  They can vary in size, from small ponds to massive lakes like the Great Lakes in North America.  These freshwater sources are replenished by precipitation, such as rain and snowmelt, and are often home to diverse ecosystems.

Freshwater rivers are flowing bodies of water that carry freshwater from higher elevations to lower elevations.  They are essential for providing water to plants, animals, and human communities.  Rivers are often used for transportation, agriculture, and as a source of drinking water.

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When colorblind woman married a color sighted man. They have no daughters, but all of your sons are colorblind. This same X chromosome is associated with both the gene underlying color vision.

A molecule that might be discovered in the nucleus of a cell. Genes are organized into a chromosome from proteins and DNA. Duplicated chromosomes dictate whether you will be a male or a girl when you were born.

Your DNA, genetics, and chromosome all play a role in who you are. Chromosomes transfer DNA within cells. Genes are parts of human DNA that are responsible for your unique physical characteristics.

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After an action potential's hyperpolarization phase, the Na/K pump aids in the axon segment's recovery to its resting potential.

The potassium channel close after hyperpolarization, allowing the neuron to revert to its resting state of -70 mV thanks to its inherent permeability to sodium and potassium. Depolarization, a sudden rise in potential, occurs all-or-nothing in neurons and is brought on by the activation of sodium channels in the cell membrane. Repolarization, the ensuing restoration to the resting potential, is facilitated by the activation of potassium channels. Potassium rushes out from the cell along its electrical potential as a series of voltage-gated ion channel open. The membrane potential is quickly reduced by these occurrences, returning it to its regular resting condition.

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An rise in contractility typically results in an increase in stroke volume and, as a result, preload. As according Starling's law of a heart, a rise in preload causes an increase in the force of contraction.

The intensity of myocyte contract, also known as inotropy, is referred to as contractility. The volume of the heart's stroke grows even as force of contraction rises because the heart can circulate more blood out of it.

ABSTRACT. When pressure (aortic pressure) and preload are present, the relative capacity of the heart to evacuate a stroke volume (SV) is known as contractility (end-diastolic volume; EDV).

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Cerebrum is the largest portion and is responsible for reasoning, remembering, including voluntary actions.

The cerebrum, which is the biggest component of the brain, controls temperature as well as initiating and coordinating movement. Speech, perception, thought and reasoning, real concern, emotions, as well as learning are all made possible by different regions of the cerebrum. Other functions deal with the senses of sight, sound, touch, others and.

Right and left hemisphere, or sides, of the cerebrum exist. Any or all of these abilities may be hampered by a stroke, depending on the region and portion of the cerebral cortex affected: both motion and feeling. Speaking and writing. The mechanism of plasticity allows the brain, which is highly resilient, to heal itself.

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because the truck is moving to the east faster than the ball is moving west.

The option is A; Endocrine signaling (ex. hormones secreted into the blood stream travel and bind to receptors on distant cells) .

Hormones produced into extracellular fluid disperse into the blood or lymph, where they can travel long distances throughout the body. Lipid-derived (soluble) hormones, such as steroid hormones, permeate through endocrine cell membranes.

They attach to transport proteins as they leave the cell, keeping them soluble in the circulation. Hormones search for target cells throughout the body, either in the bloodstream or in the fluid surrounding them. When hormones attach to particular protein receptors within or on the surface of a target cell, they precisely affect the cell's actions.

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In polar solvents, such as water, polar molecules are much more soluble. Hydrophobic nonpolar compounds are insoluble in water. Acidity rises with electronegativity whereas basicity falls.

When something is hydrophobic, it won't dissolve in water. Hydrophobic compounds tend to have -CH2- sequences and rings as chemical groups (hydrocarbons). These chemicals are incapable of forming hydrogens, hence therefore have pretty modest surface free energies.

The hydrophobic effect, as defined by thermodynamics, is the change in free energy in the water enclosing a solute. While a deleterious free energy fluctuation denotes hydrophilicity, a positive energy storage change of something like the aspect indicates hydrophobicity.

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Cell theory explains the origin of cells and that all cells are originated from pre-existing cells.

Cell theory is given by Matthias Schleiden and Theodor Schwann through observation of animal and plant cells.

The cell theory is crucial because it clarifies the idea of a cell and contains the subsequent postulates: The primary building block of life is the cell. All cells, or omnis cellula e cellula, develop from pre-existing cells. Cells comprise the basis of every living thing on Earth.

Organisms can be unicellular or multicellular.

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Answer:

please explain what you want to know about this

Explanation:

(c) transcription factors are likely to be the cytoplasmic proteins to which dioxin binds

Transcription factors are proteins involved in the process of converting, or transcribing, DNA into RNA. Transcription factors include a wide number of proteins, excluding RNA polymerase, that initiate and regulate the transcription of genes. The transcription factors Oct4, Sox2, Klf4 and Nanog act as triggers for the induction of somatic cells to pluripotent stem cells. Oct4, Sox2, Klf4 and Nanog are all essential in stem cells and play an important role in biological processes. According to recent data, the human genome encodes about 1500 regulatory sequence-specific DNA-binding factors (transcription factors, TFs) [7–9]. TFs constitute a large functional family of proteins directly regulating the activity of genes. There are 3 types of transcription factors: general, specific, and regulatory transcription factors.

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Since the m/v (mass/volume) ratio of solution B is higher than that of solution A, therefore the semi-permeable membrane will cause the decrease in volume of solution A due to osmosis.

Osmosis is the process of movement of solvent particles from the region of their higher concentration to the region of lower concentration through a semi-permeable membrane. It can be conversely said that the movement of solvent occurs from low solute region to high solute region.

A semi-permeable membrane is a thin membrane which allows the transfer of only solvent and very small sized molecules through it. Large sized solute particles cannot pass through it.

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The founder effect, in which a small group of people departs from their native population and finds a brand-new, isolated community, is one factor contributing to genetic drift.

The founder effect, in terms of genetics, is the reduction in genomic variability that occurs when a small population splits off from a larger one. In terms of genotypes and physical characteristics, which may be very different from the original bigger population, the resulting new subpopulation will eventually resemble the original small, isolated group. The fact that some subgroups of the population are more likely to have certain genetic illnesses may also be explained by the founder effect. On rare occasions, a founder effect may aid in the emergence of new species. Due to the founder effect, the smaller group that separated from the larger population may have had less genetic diversity.

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A- The parental genotype is VvPrBm/vprbm. B- the gene order is v-pr-bm. C- the genetic map of the three loci is v -- 0.003 -- pr -- 0.004 -- bm. D- the interference is: I = 0.999993

A- The parental genotype is VvPrBm/vprbm. The double crossover genotypes are Vvprbm/vprBm and vprBm/Vvprbm.

B. There are 40 recombinant offspring out of a total of 784 offspring. This gives a recombination frequency of 40/784 = 0.051, or 5.1%.

the recombination frequency between v and pr is 2/784 = 0.003, while the recombination frequency between pr and bm is 3/784 = 0.004. Since the recombination frequency between v and pr is lower, we can conclude that v is located closer to pr than to bm. Therefore, the gene order is v-pr-bm.

C. the recombination frequency between pr and bm is 0.004. Therefore, the genetic map distance between v and pr is 0.003 map

The total genetic map distance between v and bm is the sum of the distances between v and pr and between pr and bm, which is 0.003 + 0.004 = 0.007 map units.

The genetic map of the three loci is as follows:

v -- 0.003 -- pr -- 0.004 -- bm

D. the coefficient of coincidence is:

C = observed double crossovers / expected double crossovers

C = 2 / (1.2 x

[tex] {10}^{5} [/tex]

) = 1.7 x

The interference (I) is a measure of the degree to which one crossover interferes with the occurrence of another crossover nearby.

I = 1 - (observed double crossovers / expected double crossovers)

In this case, the interference is:

I = 1 - (2 / (1.2 x

[tex] {10}^{5} [/tex]

)) = 0.999993

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The Eustachian tube's functions include bringing fresh air into the middle ear cavity and balancing pressure between both the outer and center ears.

The bottom of your esophagus and the middle ears are connected by eustachian tubes. They aid in ear fluid drainage and ear pressure balancing. Your eustachian tubes may occasionally become obstructed as a result of diseases, allergies, or colds.

Decongestants or antihistamines are two popular treatments for Eustachian tube dysfunction. Sometimes, the problem could get worse as a result of this treatment. Contact your doctor if prescription medications or antidepressants do not relieve your symptoms. For treatment, you must visit an expert in ears, noses, and throats.

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A gymnosperm, or pine tree leaf cell, has 20 chromosomes. This pine tree's seeds should include some cells with 10 and 20 chromosomes, if you were to inspect one.

The right response is 3n. In the endosperm, there are 3n chromosomes. Triple fusion, as it is known, refers to the process of fusing three haploid nuclei to create the endosperm. There are 2n chromosomes in both plants and mammals.

Gymnosperms have haploid endosperm. It is post-fertilization tissue in angiosperms, where it is often triploid in nature. In pre-fertilization tissues, it is equivalent to the female gametophyte, making it haploid in nature.

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B lymphocytes, mast cells and the CD4 T lymphocytes are the cells which are responsible for stimulating the type I hypersensitivity.

The correct option is option d.

Type I hypersensitivity which is also known as the immediate hypersensitivity is basically an allergic reaction which basically provoked by the re-exposure to a particular type of an antigen which called as an allergen.

In type I hypersensitivity, B cells basically get stimulated by the CD4⁺ T cells in order to produce IgE antibodies which are specific to an antigen. During the process of sensitization, these IgE antibodies which were produced bind to FcεRI receptors which are present on the surface of the tissue mast cells as well as the blood basophils.

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A group of sprinters given the diet will show a greater decrease in race times compared to an otherwise similar group of sprinters not given the diet. Hence, option D is correct.

Sports performance can be improved by a proper diet. The majority of an athlete's vitamin and mineral requirements should be covered by a well-planned, nutrient-rich diet, which also includes adequate protein to support muscle growth and repair. The diet should be built around foods high in unprocessed carbohydrates, such as wholegrain bread and cereals.

Thus, a group of sprinters given the diet will show a greater decrease in race times compared to an otherwise similar group of sprinters not given the diet. Hence, option D is correct.

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Your question is incomplete, most probably the full question is this:

Alex is a physiologist studying the effect of diet on Olympic athletes. He hypothesizes that a calcium-enriched diet will decrease the race times of sprinters. Which of the following is the best argument of expected outcome?

Incorrect    

 A. A group of sprinters given the diet will show a decrease in muscle mass compared to an otherwise similar group of sprinters not given the diet.    

B. A group of sprinters given the diet will show an increase greater increase in race times compared to an otherwise similar group of sprinters not given the diet.    

C. A group of sprinters given the diet will show a greater increase in vigor compared to an otherwise similar group of sprinters not given the diet.    

D. A group of sprinters given the diet will show a greater decrease in race times compared to an otherwise similar group of sprinters not given the diet.    

E. A group of sprinters given the diet will show a greater increase in muscle mass compared to an otherwise similar group of sprinters not given the diet.    

A large-scale wildfire that clears a large area of forest would begin the process of secondary succession.

Ecologicаl succession is the process of chаnge in the species structure of аn ecologicаl community over time. It is а process by which аn ecologicаl community undergoes more or less orderly аnd predictаble chаnges following а disturbаnce or the initiаl colonizаtion of а new hаbitаt. Succession thаt begins in new hаbitаts, uninfluenced by pre-existing communities is cаlled primаry succession, whereаs succession thаt follows disruption of а pre-existing community is cаlled secondаry succession.

А clаssic exаmple of secondаry succession occurs in oаk аnd hickory forests cleаred by wildfire. Wildfires will burn most vegetаtion аnd kill those аnimаls unаble to flee the аreа. Their nutrients, however, аre returned to the ground in the form of аsh. Thus, even when аreаs аre devoid of life due to severe fires, the аreа will soon be reаdy for new life to tаke hold.

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Answer:

A. a way to test for chromosomal mutations

Explanation:

You're welcome.

We define karyotype as the set of chromosomes contained in the cells of an organism.

Morphologically, these chromosomes are identified, differentiated and classified according to the size and location of the centromere (region of the chromosome intermediate to the symmetrical or asymmetrical, short or long arms).

Classification of chromosomes:

Metacentric → Centromere positioned at the center of the chromosome; Submetacentric → Centromere displaced to one end of the chromosome; Acrocentric → Chromosome bearing a terminal sphere (satellite), located at the end of the short arm; Telocentric → Chromosome formed by only one arm, with strictly terminal centromere.

In order to determine and visualize the karyotype, making it possible to quantify the typical number of chromosomes of a species, it is necessary to interrupt the cell division process at the time of metaphase, the phase in which the chromosomes reach the maximum condensation.

In the human species, the karyotype of a diploid cell, for example, consists of 46 chromosomes, the last sex-defining pair (XX or XY – allosomal pair), differing the male and female gender (man and woman) and the other 22 pairs (autosomal - AA) responsible for decoding the other characteristics.

Thus, we have for a normal karyotype of the human species, the following possible representations:

Male karyotype → 22AA + XY or 46,XY

A woman's karyotype → 22AA + XX or 46,XX

Answer:

acid

Explanation:

An acidic solution has a high concentration of hydrogen ions (H

+

+

start superscript, plus, end superscript), greater than that of pure water.

Answer:

degranulation

Explanation:

The single word for the behavior of mast cells is "degranulation."

When the population is big and selection is strong, weak, or ineffective, drift is predicted to be dominant.

A population is the entire set of people in a group, whether that group is a country or a collection of people who share a certain trait. A population is the group of people from which a quantitative sample is taken in statistics.

Chinese people make up the largest nationality in the world, and Mandarin is the language that their native speakers use the most. The majority of people on earth live in cities and suburbs, so there has been substantial migration into metropolitan areas.

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Sucrose is the smallest carbohydrate amongst the given carbohydrates as it is a disaccharide.

The correct option is option a.

Carbohydrates are basically macronutrients and are one of the main ways by which the human body derives its energy. They are known as carbohydrates as they consist of carbon, hydrogen and oxygen atoms. The carbohydrates can be monosaccharides, disaccharides or polysaccharides.

Among the given carbohydrates, sucrose is basically the only disaccharide and is composed of two monosaccharide units which are held together by the help glycosidic bond. Rest of the given carbohydrates, that is, cellulose, glycogen, chitin and starch are basically polysaccharides.

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The following describes two partially reproductively isolated populations that have become sympatric are

Speciаtion is the process by which new species form. It occurs when groups in а species become reproductively isolаted аnd diverge. In аllopаtric speciаtion, groups from аn аncestrаl populаtion evolve into sepаrаte species due to а period of geogrаphicаl sepаrаtion. In sympаtric speciаtion, groups from the sаme аncestrаl populаtion evolve into sepаrаte species without аny geogrаphicаl sepаrаtion.

Your question is incomplete, but most probably your full options were

A. Gene flow between the populations will occur.

B. The populations may eventually become separate species through reinforcement.

C. The populations will continue to be partially reproductively isolated.

D. The populations may eventually lose their genetic distinctiveness.

E. Hybrids will be inviable or infertile.

Thus, the correct options were A, B, and D.

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Answer: yes atom is the smallest level of organization

Explanation:

Answer:

Its True

Explanation:

Simple diffusion: directly through the cell membrane

Facilitated diffusion: down the concentration gradient

Active transport: against the concentration gradient

Bulk transport: movement of transport vesicles out of cell

Rainfall ( - Presence of a large body of water) ,Temperature ( Presence of a mountain range )  are factors are used to determine the climate of a region

The amount of rainfall and sunlight-hence determining temperatures- that a region receives annually greatly determines its climate. Climate is the general weather patterns of a region studied for many years. The climate, on the other hand, affects the ecosystem of regions influencing the kind of plants and animals that it inhabits.

This is because it is natural for life to become adapted to specific climatic regions due to natural selection and evolution creating different species across different regions. The way predominant winds blow across a region also affects the climate because these winds may bring in seasonal rainfall or dryness/drought.

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Which of the following factors are used to determine the climate of a region? Select all that apply. Check All That Apply -

Temperature - Presence of a mountain range -

Species that occupy an area - Rainta-

Rainfall - Presence of a large body of water -

Soil prit - Tilt of the Earth on its oxis

Answer:

The heat of an object is the total energy of all the molecular motion inside that object. Temperature is the measure of the thermal energy or average heat of the molecules in a substance. It's a measure of the number of atoms multiplied by the energy possessed by each atom.