Answer:
In hypertonic solution with high solute concentration than the plant cell that is about 1.0 M
Explanation:
The tonicity of the cell is determined by placing the cells in an either hypotonic, hypertonic or isotonic solution.
The plasmolysis refers to the process taking place in the plant cell which allows the movement of the water out of the cell through the process of osmosis which leads to the shrinkage of the cytoplasm.
The cytoplasm shrinks when the cell is placed in the hypertonic solution which contains a high amount of solute than the plant cell and therefore less amount of water. As a result of this, the water moves out from the cell to the solution down their concentration gradient from high to a low level.
Thus, In hypertonic solution with high solute concentration than the plant cell that is about 1.0 M is the correct answer.
To demonstrate plant cell plasmolysis with an internal solute concentration of 0.8M, the cell should be suspended in a hypertonic solution where water moves out of the cell through osmosis, causing the cell to shrink.
Explanation:To demonstrate plasmolysis in a plant cell with an internal solute concentration of 0.8M, the cell should be suspended in a hypertonic solution.
A hypertonic solution has a higher solute concentration than the cell. When the cell is placed in the hypertonic solution, water will move out of the cell through osmosis, causing the cell to shrink and undergo plasmolysis.
For example, if the cell is suspended in a 1.6M salt solution, the higher concentration of solutes in the salt solution will cause water to move out of the cell.
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Fermentation enables glycolysis to continue as long as the glucose supply lasts. Select one: True False
Fermentation is a process that allows glycolysis to continue producing energy from glucose, even in the absence of oxygen, by recycling NAD+ from NADH.
Explanation:The statement 'Fermentation enables glycolysis to continue as long as the glucose supply lasts' is true. Glycolysis is a way that cells gain energy from glucose without the need for oxygen. However, during the process of glycolysis, two molecules of NAD+ are turned into NADH. For glycolysis to continue, the levels of NAD+ need to be replenished. This can be done naturally in the presence of oxygen, but in conditions without oxygen, organisms must use other methods to regenerate NAD+ from NADH, one of which is through the process of fermentation. Through fermentation, NAD+ is recycled, which allows glycolysis, and therefore the breakdown of glucose for energy, to continue.
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Fermentation allows glycolysis to continue in the absence of oxygen by regenerating NAD+. This ensures that as long as there is a supply of glucose, the process of glycolysis can continue.
Explanation:The statement 'Fermentation enables glycolysis to continue as long as the glucose supply lasts' is True. Fermentation is a metabolic process that allows glycolysis to continue in the absence of oxygen by recycling NAD+ from NADH. This is done using an organic molecule as the final electron acceptor.
Glycolysis itself is the metabolic pathway that converts glucose into pyruvate, with the production of small amounts of ATP (energy). Therefore, as long as there are glucose molecules to be broken down and a way to recycle NAD+, glycolysis can continue.
An example of this process is in yeast cells in the absence of oxygen: they undergo alcohol fermentation, where glucose is converted to ethanol, thereby recycling NAD+ and enabling glycolysis to continue indefinitely as long as glucose is available.
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___________ claims are initiated by the parent and/or child based on the harm suffered as a result of being born.
Answer:
Wrongful life
Explanation:
Wrongful life is the term used for the claim initiated by the parent based on the harm or injury brought upon a child at birth either due to negligence of the health caregiver or health facilities
At high latitudes, in both the Northern and Southern Hemispheres, seasonal shifts in input of solar energy produce ________ with low average temperatures and shorter day lengths and _______ with high average temperatures and longer day lengths.
Answer:
Winter and Summer season
Explanation:
The season occurs on earth because of the tilt of the earth's rotational axis. There occurs variation in season from one place to another depending upon various factors, in both the northern and the southern hemispheres.
In the higher latitudinal areas, in both the hemispheres, there occurs winter and summer season. During the time of winter in the northern hemisphere, the earth comes closer to the sun, but because of the tilt of the earth's rotation axis, it can reflect the majority of the incoming solar radiation back into space. The winters are usually characterized by the occurrence of low average temperature and the duration of daylight is much shorter.
On the other hand, during the time of summer, the earth is at the furthest from the sun, but most of the solar radiation easily enters the earth's atmosphere. It is due to which the average temperature increases and the duration of daylight are longer.
Read the clinical scenario, and then answer the questions that follow to become familiar with the traditional NCLEX question format. Ms. Hungh, a Burmese immigrant, enters your clinic with her interpreter complaining of fatigue, weight loss, persistent cough, and rust-colored sputum The interpreter explains that Ms. Hungh has had this cough for many months in her home country and, now that she is in America, is seeking assistance for her condition. Culturing of the sputum resulted in the growth of distinct colonies on the medium, and the technician informs you that further isolation by subculturing is now needed. You understand that this is accomplished by taking a bit of growth from an isolated colony and inoculating a separate medium, resulting in the production of a:______.
a) diagnosis.
b) pure culture.
c) broth.
d) mixed culture.
Answer:
B) Pure culture.
Explanation:
Obtaining a pure culture involves culturing the organism on the bacteriologic agar. Initially blood agar is used because it supports the growth of many bacteria and the type of hemolysis can be observed.
In order to obtain pure cultures, following steps are done :
1)The bacteria are normally streak onto solid media.
2) Inoculating loops are used for streaking.
3) Then the plate is incubated at desired temprature.
4) Then after sometimes , colonies are visible wherever a microbial cell capable of growth on particular medium was deposited on the agar surface.
As in the above scenario , a bit of isolated colony is taken and is inoculated in a separate medium thus a pure culture is formed.
Hence option B) Pure culture is the right answer.
DNA is approximately 2.5 nmnm in length. If an average man is 5 ft 10 in.in. tall, how many DNA molecules could be stacked to extend from the ground to the top of the head of an average man?
Answer:
7.112× 10⁸.
Explanation:
The length of DNA is 2.5 nm = 2.5 × 10⁻⁹m.
The average human length = 5 ft 10 in = 70 inch.
1 inch = 0.0254 m.
70 inch = 70 × 0.0254 = 1.778 m.
Number of DNA molecules = length of man / length of DNA.
Number of DNA molecules = 1.778 m / 2.5 × 10⁻⁹m.
Number of DNA molecules = 7.112× 10⁸.
Thus, the answer is 7.112× 10⁸.
What is one field you may explore if you want to study the complex relationship between culture and biology?
The field of Medical Anthropology is an apt choice for those interested in studying the complex relationship between culture and biology. It combines knowledge from social and biological sciences to study health and disease in different cultural contexts.
Explanation:If you are interested in studying the complex relationship between culture and biology, one field you could explore is Medical Anthropology. This interdisciplinary field combines aspects of both social sciences and biological sciences to understand how cultural practices and biology influence health, disease, and illness in different societies and cultures. For example, a medical anthropologist could study the cultural beliefs affecting nutritional habits in a certain population and how those habits impact their biological health.
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Fibrocartilage is designed to withstand repeated compressive forces. Fibrocartilage is designed to withstand repeated compressive forces. True False
Answer:
True
Explanation:
Fibrous cartilage consists of several collagen fibers both type I and type II. This makes fibrous cartilage flexible, tough, and elastic. This structure of fibrous cartilage acts like a intercalated bones and helps in dissipating compressive force as the collagen undergo differential staining when it is under compression as compared to the stain created when collagen in under tension. Thus, it possess compressive stiffness and shear moduli that can bear load and wear resistance
Hence, the given statement is true
Fibrocartilage is designed to withstand repeated compressive forces and has a large amount of collagen fibers. It is tough and can absorb pressure, making it suitable for structures like the knee joint and intervertebral discs.
Explanation:True Fibrocartilage is designed to withstand repeated compressive forces. Fibrocartilage contains a large amount of collagen fibers, giving the tissue tremendous strength. Examples of fibrocartilage include the menisci in the knee joint and intervertebral discs. It is tough because it has thick bundles of collagen fibers dispersed through its matrix, allowing it to absorb pressure and withstand compressive forces.
The population that is mentally ill is arrested and prosecuted at a rate that is how many times that of the general population?
Answer:
4
Explanation:
Based on the information provided within the question it can be said that this population is arrested and prosecuted at a rate four times higher than that of the general population. This is mainly due to the fact that not everyone is well informed on the various different mental illnesses that exist and, since these illnesses cause individuals to break the law more often than the general population then they are arrested and prosecuted at a much higher rate.
Which of the following is not an ecosystem service? A. decomposition B. seed banks C. pollination D. maintenance of soil fertility E. prevention of soil erosion
Answer:B
Explanation:
Among the options provided, seed banks are not considered an ecosystem service. Seed banks are human-created for biodiversity conservation and differ from natural ecosystem services like pollination or soil fertility maintenance.
The question asks: Which of the following is not an ecosystem service? An ecosystem service is a process or a product of natural systems that benefits humans in some way, such as through the provisioning of food, water, or air purification. The options provided are: A. decomposition, B. seed banks, C. pollination, D. maintenance of soil fertility, E. prevention of soil erosion.
Among these, seed banks (option B) are not considered an ecosystem service in the same manner as the others listed. Seed banks are human-made repositories where seeds are stored for conservation and agricultural purposes. Unlike decomposition, pollination, maintenance of soil fertility, and prevention of soil erosion, seed banks do not directly result from natural ecosystem processes but are instead a tool for conserving biodiversity.
Ecosystem services such as pollination, maintenance of soil fertility, and prevention of soil erosion are critical for supporting food production, regulating the environment, and maintaining biodiversity. These processes occur naturally and provide significant benefits to human societies, showcasing the inherent value of preserving and maintaining healthy ecosystems.
Epithelial cells ____.
a. make up the inner layers of connective tissue
b. form adipose tissue, cartilage, bone tissue, and blood
c. are striated
d. are found in the visible portion of hair, fingernails, beaks, or feathers
e. communicate with each other through chemical signals
Answer:a. make up the inner layers of connective tissue
Explanation:Epithelial cell are cell made up of inner connective tissues. This tissues helps in absorption of nourishment/ nutrient needed by the epithelial tissue.
They are arranged into sheet and joined to each other. This special properties aids it function.
Epithelial cell have modified surface structurally and through internal modifications this aids there ability for absorption and secretion of some glands such as liver, digestive tract and also act as barrier.
They form a sheet of cell called epithelia that serves as linning for body surfaces.
They can be classiified into three bases the shape on how the cells are packed;
Squamous epithelium- They are usually wider. They can be found in blood vessels
Cuboidal epithelium are almost similar in height and width
Columnar exceptionally are Tall and wide.
Final answer:
Epithelial cells line inner and outer body surfaces, including the skin and the lining of various internal cavities, and are essential for protection, secretion, and absorption. Option a is the correct answer.
Explanation:
The correct answer to the question "Epithelial cells ____." is that epithelial cells make up the surface of the skin, line the various cavities and tubes of the body, and cover the internal organs. They are found as tightly packed layers of cells arranged in sheets. This kind of tissue is known for functions such as protection, secretion, and absorption. It is not correct to say that epithelial cells form connective tissue or that they are striated, as these characteristics apply to different types of tissues. Instead, epithelial cells are crucial for forming barriers between the body and the external environment, as well as lining internal spaces. Therefore, option a. make up the inner layers of connective tissue is the correct answer.
What is a diagnostic test in which an X-ray is obtained after injection of radiopaque contrast material into blood vessels?
Answer:Digital subtraction angiography (DSA)
Explanation:
DSA is a fluroscopy technique which is used in intervenous radiology.
This is done in order to visualize the the blood vessels found in dense or bony soft tissue environment.
The image is produced with the help of contrast medium by subtracting the pre-contrast image from the subsequent image and hence named as digital subtraction angiography.
The following is an excerpt from the case study "It's All Greek to Me": "The hematologist meets with the Stamos family in the exam room. 'Mr. and Mrs. Stamos, there are some things that do not look normal in Nikoleta's blood. I am not sure of the cause, but I do know that Nikoleta's red blood cells aren't shaped correctly and they are not the right color. The red blood cells should be very red under the microscope and her red blood cells are light pink." . How did this observation lead to identifying the type of anemia exhibited by Nikoleta?
A. The shape of the red blood cells suggested that they were causing blood clots.
B. The shape of the red blood cells suggested that they were causing arterial plaques.
C. The pale color of the red blood cells suggested they had malfunctioning hemoglobin.
D. The pale color of the red blood cells suggested they had malfunctioning cell membranes.
Answer:
The pale color of the red blood cells suggested they had malfunctioning hemoglobin.
Explanation:
Red blood cells are the blood cells that have the protein hemoglobin. Hemoglobin is bright red in color when it is bound to oxygen. The heme of hemoglobin binds to oxygen and makes the RBCs to look red in color. Anemia is a condition when the count of red blood cells or the amount of hemoglobin is less in the blood.
When hemoglobin is not able to bind or release oxygen properly, the person experiences anemia. In the given observation, the red blood cells appear pink rather than red in color. This means that the hemoglobin is not working properly leading to deficiency of oxygen to the body cells and anemia.
Answer:
The pale color of the red blood cells suggested they had malfunctioning hemoglobin.
Explanation:
In a certain variety of chicken, some offspring have a feather pattern that is black-and-white checkered. Chickens with this checkered feather pattern result from the cross of a black chicken with a white chicken.Which of the following types of inheritance is most likely responsible for the checkered feather pattern?
codominant
dominant
polygenic
sex-linked
Final answer:
The checkered feather pattern in chickens resulting from a cross between a black chicken and a white chicken indicates codominant inheritance, where both alleles are equally expressed.
Explanation:
The checkered feather pattern seen in some offspring resulting from a cross between a black chicken and a white chicken is most likely a result of codominant inheritance. This type of inheritance pattern occurs when two different alleles for a gene are expressed equally, leading to a phenotype that displays characteristics of both alleles. In the case of the chickens, neither the black nor white feather color is fully dominant over the other; instead, both colors are expressed, resulting in the checkered pattern.
Based on your understanding of the chapter material and the information in the passage, which of the following best defines something as a virus? Are virophages a type of virus or something different?
a. It must have a capsid and double-stranded or single-stranded DNA. Virophages are therefore a type of virus.
b. It must have a capsid and a linear nucleic acid that encodes replication enzymes. Virophages are therefore not a type of virus.
c. It must have an envelope, capsid, and nucleic acid, which can be double-stranded or single-stranded, and DNA or RNA. Virophages are therefore not a type of virus.
d. It must have a capsid and linear nucleic acid. Virophages are therefore a type of virus.
e. It must have a capsid and a nucleic acid, which can be double-stranded or single-stranded, circular or linear, and DNA or RNA. Virophages are therefore a type of virus.
Answer:
Option-E
Explanation:
Virophages are the small circular dsDNA viruses which are parasitic to the other giant viruses. The virophages reduce the number of other giant viruses by using their replication machinery to replicate themselves.
The virophages are considered the virus due to the presence of the circular double-stranded DNA enclosed in a capsid.
In the given question the possibility of the features shown by the virophages is maximum in the Option which has stated the similarity of the virus to the virophages like in the option-E.
Thus, Option-E is the correct answer.
It is never optimal to exercise an American call option on a non-dividend paying stock early. True or false?
Answer:
False
Explanation:
Exercising an American call option on a stock with non –dividend provides greater interest or saving on interest as compared to holding those call option.
In general, An American call can be exercised any time prior to its expiry time limit. In case of an American call on a stock with dividend, early exercise before the expiry is optimal. Early exercise also provides for in depth money options.
Large-scale cancer studies have found that the p53 gene is often mutated in tumor cells. In fact, the gene encoding the p53 protein is mutated in tumor cells more often than any of the other 20,000 human genes. Based on this information, why was the Bunz study important?
Bunz's study provided a deeper understanding of the role of the p53 gene in the cell cycle, which can be used to enhance the understanding of cancers pathways and lead to new therapeutic treatments.
Tumor suppressor genes are genes that in normal conditions repair errors in DNA, indicate to the cell when they must die (it is known as programmed cell death or apoptosis), slow down cell division, etc.
The p53 gene is a tumor suppressor gene expressed in the nucleus of normal cells, where P53 protein acts as a transcription factor.
This gene (p53) is involved in many signaling pathways such as cell senescence, cell cycle arrest, DNA repair, etc.
The work by F. Bunz (1998) provides useful information on how P53 protein regulates the expression of target genes and thus avoids the proliferation of cancer cells.
In conclusion, Bunz's study provided a deeper understanding of the role of the p53 gene in the cell cycle, which can be used to enhance the understanding of cancers pathways and lead to new therapeutic treatments.
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The Bunz study is significant as it unravels the pivotal role of the p53 gene, its mutations, and their association with most types of cancer. Mutations in p53 disrupt its normal regulation of the cell cycle, triggering uncontrolled cell growth and permitting propagation of these abnormal cells, contributing to cancer.
Explanation:The Bunz study is critical in our understanding of cancer since it provides insights into the role of the p53 gene and its mutations which are prevalent in tumor cells. p53 is a tumor suppressor gene, with proteins that regulate the cell cycle, particularly at the G₁ checkpoint. When functioning correctly, p53 proteins monitor and repair DNA damage, or trigger cell death processes (apoptosis) in cases where repair is not feasible.
Mutations in the p53 gene could generate abnormal p53 proteins that fail to check and halt cell division once the cell's DNA is damaged, leading to uncontrolled cell growth and further accumulation of potential harmful mutations. These changes could lead to unchecked cell division, contributing to cancerous growth and the spreading of these abnormal cells (metastasis). Therefore, understanding the functioning of the p53 gene, its roles, and effects of its mutations is paramount to our grasp of cancer biology and avenues for its prevention and treatment.
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The basic units of the brain and spinal cord that process, store, and transmit information are the _____.
Answer:
Neuron
Explanation:
This is the applicable unit calculation for actions in which are taken within the brain and spine. Neurons allow the transfer of information, allowing us to move our body in a desired form
Answer:Central Nervous System
Explanation: The central nervous system is the basic Unit of spinal cord and Brain. Its regulates body activities. The brain is responsible for integrating most information and coordinating body functions.
Weber’s law is most closely associated with ____. a.the just noticeable differenceb.the absolute thresholdc.sensory reductiond.sensory deprivation
Answer: Option A: The just noticeable difference
Explanation:
Weber law is most mostly referred to as the "just noticeable difference" law which supports the idea that the difference threshold is a constant fraction of the original stimulus. It is mostly possible to notice a change in the music volume when trying to study in somwhere very quiet while it may be almost impossible to establish a difference in the music volume while out in a party.
What were some of the misconceptions people had about the cause of the flu epidemic of 1918?
The 1918 flu pandemic was the severe pandemic in recent history. The common remedy for this flu is Aspirin, or acetylsalicyclic acid are used to reduce fever or pain.
Explanation:
The influenza flu is caused by an H1N1 virus with genes of origin. It is found that about 500 million people among one third of the world's population are affected by virus.
It is an oddity of history that the influenza epidemic of 1918 has been overlooked in the teaching. Documentation of the disease is selected from the holdings of the National Archives regional archives.
These documents helps in epidemic that takes right place as a major disaster. Air purifiers removes the smallest microbes in the air by reducing the harmful germs that includes cold, flu, dust and mold spores.
Page(s) 80-81 Understand text setting. In organum, the lower voice moves slowly, and its pitches are from a chant. The composer adds the upper voices. What best describes the text setting of the upper voices? The upper voices sing –.
Answer:
melismatically (lots of pitches per syllable of text)
Explanation:
Melismatic Music
A melisma is observed when a singular syllable of text is stretched over varing type of pitches. Take for instance, the song "Ding Dong Merrily on High;" observe the melisma on the first syllable of the word 'Gloria.' Observe how the syllable is stretched over 16 varying type of pitches.
The first attached image below shows the melisma on the first syllable of the word.
Some singers such as Beyoncé, Christina Aguilera, or the late Whitney Houston have unique vocal skills and this can be perceived to be through their use of melismas to beautify melodies -- mostly at the ends of their words. Take for example, late Whitney Houston cover of Dolly Parton's song ''I Will Always Love You'' is filled with melismas!
You would like to know whether the progeny of a pair of mated fruit flies are distributed among the resulting four phenotypic classes in a 1:1:1:1 ratio. You perform a chi-square test and obtain a p value of 0.04. Assuming you have done the test correctly, select the best interpretation of this result.The p value allows you to make a decision regarding the likelihood of the observed values. You would like to know whether the progeny of a pair of mated fruit flies are distributed among the resulting four phenotypic classes in a 1:1:1:1 ratio. You perform a chi-b.) square test and obtain a p value of 0.04. Assuming you have done the test correctly, select the best interpretation of this result.
a) The differences between the observed and expected counts are too large to be attributed to chance.
b) The traits being studied are on separate chromosomes.
c) Approximately 4% of the offspring lie outside the range of values expected for a 1:1:1:1 ratio.
d) The phenotypic ratio is actually 9:3:3:1
a) The differences between the observed and expected counts are too large to be attributed to chance.
Explanation:
The chi square test is to know the probability of correlating with the hypothesis given. A low result as compared to observation suggests that hypothesis is not correct.
In this example ratio of 1:1:1:1 shows law of independent assortment. The chances exhibit are 25% thus the value of p 0.04 is very less.
Hence, difference between observed and expected count is very large to be attributed to chance.
The correct interpretation of the chi-square test result with a p-value of 0.04 is that the differences between the observed and expected counts are too large to be attributed to chance.
The correct interpretation of the chi-square test result with a p-value of 0.04 is:
a) The differences between the observed and expected counts are too large to be attributed to chance.
This means that the observed distribution of progeny among the phenotypic classes is significantly different from the expected 1:1:1:1 ratio. The p-value of 0.04 indicates that there is a 4% chance that the observed deviations from the expected ratio are due to random chance.
It does not necessarily imply that the phenotypic ratio is 9:3:3:1 or that the traits being studied are on separate chromosomes.
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All fungi are
Group of answer choices
eukaryotes and heterotrophic.
eukaryotes and autotrophic.
prokaryotes and autotrophic.
prokaryotes and heterotrophic.
Answer:
eukaryotes and heterotrophic.
Explanation:
Eukaryotes are organisms whose cells nucleus are enclosed.
Heterotrophs are organism that cannot produce its own food, instead they absorb nutrients from plant and animal remains.
Final answer:
Fungi are eukaryotes and heterotrophic, meaning they have cells with a nucleus and obtain nutrients by consuming organic matter from outside themselves.
Explanation:
All fungi are:
Fungi, such as mushrooms and molds, are eukaryotes and heterotrophic. This means they have cells with a nucleus (eukaryotic) and obtain nutrients by consuming organic matter from outside themselves (heterotrophic). Unlike plants, fungi do not perform photosynthesis and rely on other organisms for food.
For example, yeast is a type of unicellular fungus that is commonly used in baking and brewing. It breaks down sugar into carbon dioxide gas and alcohol through its metabolism.
Male northern elephant seals (Mirounga angustirostris) compete with one another for territories along the beach. Males defend these territories throughout the breeding season. The males that win the male–male competitions defend the "best" territories, and have access to females that stay in that territory of the beach. The females land on the beach during mating season, choosing which territory of the beach to join. They then disproportionately breed with the male that defends that area of the beach. At what point may intersexual selection occur in these elephant seals?
A. when the female is swimming to the beach
B. when the female leaves the beach after mating with a male
C. when the male defends his group of females against a different male
D. when the female lands on the beach and chooses her resting location
E. when the male mates with a female within his group
Intersexual selection in northern elephant seals occurs when the female lands on the beach and selects her resting location, indirectly choosing the dominant male that controls that territory.
The point at which intersexual selection may occur in these northern elephant seals is when the female lands on the beach and chooses her resting location. This is because the females are the ones making the choice of which territory to join, thereby also choosing the male that occupies and defends that territory. Option D
Intersexual selection entails females selecting males based on certain preferred traits. In this scenario, the act of selection is not direct; however, by choosing a territory dictated by the dominant male, the female indirectly selects the male as well. This male has already proven his fitness through intrasexual selection, where he has defended his territory from other males, exhibiting desirable traits such as strength and the ability to control resources.
Scientists developed the ________ model after their studies of the fossil record revealed that some species appear quite suddenly and then remain essentially unchanged phenotypically for a long period of time.
Answer:
Punctuated Equilibrium
Explanation:
The phyletic gradualism model and the punctuated equilibrium are aspects models of macroevolution that are characterised with varying patterns.
However, the punctuated equilibrium model of evolutionary history consists of geologically long periods of inactivity (stasis) with little or no evolution, interrupted or "punctuated" by geologically short periods of rapid evolution.
Does a bike traveling 35miles from within Springs to Alphapptta display velocity? Explain why or why
not.
Answer:
no
Explanation:
they could have been going 1 mile per hour or 10 miles per hour and we would have no idea. This just gives the distance traveled/position
Steroid hormones and thyroid hormones ________ pass across the plasma membrane; they cause the target cells to ________ that produce the characteristic effects of the hormones.
Answer:
can ,synthesize specific proteins
Explanation:
Hormones are chemical signals secreted by animals and plant that are capable of regulating body activities and maintain homeostasis.
They are transported in the circulatory system of the body
The action of hormones can be seen after the hormone has bound to its specific receptor found inside the cell.
For instance, steroid hormone and the thyroid hormones can pass through the plasma membrane to their receptors inside the cells.
When they bind with their receptors, the target cells will synthesize specific proteins that produce the characteristic effect of the hormone.
The Dunkers are a religious group that moved from Germany to Pennsylvania in the mid-1700s. They do not marry with members outside their own immediate community. Today, the Dunkers are genetically unique and differ in gene frequencies, at many loci, from all other populations including those in their original homeland. Which of the following likely explains the genetic uniqueness of this population?
A) population bottleneck and Hardy-Weinberg equilibrium
B) heterozygote advantage and stabilizing selection
C) sexual selection and inbreeding depression
D) mutation and natural selection
E) founder effect and genetic drift
Answer:
E) founder effect and genetic drift
Explanation:
Dunkers moved to Pennsylvania and inhabited a new area to develop a new population. This new population might not have the same gene pool and the same allele frequencies for all the genes as present in the original population. The change in the allele frequencies of a population due to the colonization of a new area by a few members is called the founder effect.
The small size of the new population of Dunkers present in Pennsylvania was more likely to be affected by any chance event which could have added more uniqueness to their gene pool. This is called genetic drift. Therefore, the genetic uniqueness of their population from all the other populations and from their original population might be the result of founder effect and genetic drift.
The genetic uniqueness of the Dunkers likely resulted from the founder effect, where a small number of individuals established a new population with limited genetic variation, and genetic drift, which caused random changes in allele frequencies over time.
Explanation:The genetic uniqueness of the Dunkers can likely be explained by E) the founder effect and genetic drift. The founder effect refers to the loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population. In the case of the Dunkers, the original settlers who moved from Germany to Pennsylvania would have carried a subset of the larger German population's genetic diversity.
Over time, genetic drift, or random changes in allele frequencies, would have further altered the Dunkers' gene pool, contributing to their genetic uniqueness. Because the Dunkers do not marry outside their own immediate community, this would have limited the introduction of new genetic variations into their gene pool, enhancing the effects of genetic drift and the founder effect.
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By serving as a resource for investigators, a specimen collection increases
the reliability of scientific knowledge. Which of the following best explains
why this might be true?
A. A precious object is kept hidden in a secret place so that it is not
damaged.
B. Only one scientist is allowed to view the evidence and formulate a
conclusion.
O
C. Several scientists compete to create the most entertaining
demonstration
O
D. Different scientists can observe and analyze the same items.
By serving as a resource for investigators, a specimen collection increases
the reliability of scientific knowledge because:
D. Different scientists can observe and analyze the same items.
Explanation:
Collection of specimen is a prime step in the process of scientific analysis.
These specimen are considered very precious and are kept preserved.
The collection and preservation of specimen is very important to derive reliable scientific knowledge about it because this provides an opportunity to a number of scientists to study the same specimen.
Study of the same specimen by different scientists allows various opinion and theories to come in front.
Several errors in previous investigations are also rectified.
The repeated studies on the same specimen widens the knowledge about the specimen.
Since more than one scientist agree on a conclusion the facts stated by the investigation are considered more authentic.
Two European men and two Polynesian women settled on a previously uninhabited tropical island. All four of the settlers have brown eyes, a dominant trait, but one of the Europeans is heterozygous and carries the recessive gene for blue eyes.
After several generations, 35 percent of the island population is found to have AB+ blood. This is much higher than the percentage of AB+ people in the populations from which the original settlers came. The high percentage of AB+ blood is probably due to:
Answer:
founder effect
Explanation:
When a few individuals from a population migrate to some new habitat and start a new population, the gene pool of the new population may not have the same allele frequencies as that of the original population. This change in the allele frequency of the new population is called the founder effect. In the given population, the increased frequency of the AB+ phenotype might have resulted from the founder effect. This is a chance event that occurs when a few individuals with a small fraction of genetic variations found a new population.
Since the Pleistocene ice age, deserts have been gradually forming in the southwestern United States. As the original lakes and rivers of this area shrank into isolated streams, ponds, and springs, the fishes living in them developed a strong potential for ___________.(A) speciation.(B) hybridization.(C) mechanical incompatibility.(D) temporal isolation.(E) hybrid inviability.
Answer:
(A) speciation.
Explanation:
Shrinking of water bodies and development of deserts since the Pleistocene ice age produced new vacant niches that could be inhabited by organisms such as fishes. Production of new isolated streams, ponds, and springs allowed the fishes to occupy these new water bodies. Accumulation of genetic variations to become adapted to their new habitat resulted in the evolution of several new species of fishes with many different genetic traits. This represents speciation due to geographical isolation.