Answer:they possess notochord,dorsal tubular nerve cord , pharyngeal pouches
Explanation:chordates are animals which possess the notochord.examples are humans,birds,fishes etc
At a time in the life cycle,a chordates possesses a stiff,dorsal rod which is supporting in nature (the notochord).
They also possesses a tail that extends from behind the anus.
They possess a hollow nerve cord.
They possess gills slit.
These characteristics are present developing embryo and may disappear as the embryo matures.
In humans,the notochord is replaced by the spinal column of the vertebrate.
Explain why the process of mitosis is important to eukaryotic organisms.
Answer:
Mitosis is a cell division method where the unicellular organisms such as amoeba, carries out the process of reproduction (asexual reproduction). This type of cell division process helps in the growth, betterment and development of the cells in the case of multicellular organisms.
During the time of mitosis cell division, a eukaryotic cell can produce two daughter cells that are genetically identical to each other.
What should be done to correct positioning on an anteroposterior (AP) elbow with lateral rotation, when the radial head is slightly superimposed over the proximal ulna on the first effort?
Explanation:
The elbow joint should be rotated laterally. This is because the elbow is basically a pivoted joint, however, it has the extraordinary capacity to turn the distal arm in pronation and supinationThese exceptional movements, alongside a wide scope of dynamic exertional powers, incline the elbow and its structures to critical wounds, especially with tedious movementsUnderstanding the life systems and the physical powers of development will help in diagnosisHence, the right answer is "elbow joint should be rotated laterally on an (AP), when the radial head is slightly superimposed over the proximal ulna on the first effort"
A researcher tracks the escape behavior of a population of squirrels on campus across two generations. When she plots the escape behavior of the offspring generation against parental behavior, she notes that the offspring’s behavior exactly matches the parental behavior. Nonetheless, the narrow-sense heritability equals zero. How can the heritability equal zero in this example?
Answer:
a) The additive genetic variance equals zero.
b) All the escape behavior alleles are fixed in the population.
Explanation:
The relationship between additive genetic variance and total phenotypic variance is called narrow-sense heritability. In the exercise there is no genetic variation and also the behavior of the offspring is equal to the behavior of the parents, the additive genetic variance is equal to zero, due to the constant escape behavior, which produces alleles in the population. No phenotypic variance is specified in the exercise.
Answer:
1. All the escape behavior alleles are fixed in the population.
2. The additive genetic variance equals zero.
Explanation:
According to above scenario, The parental and offspring's escape behavior is constant or same behavior. It means, there behavior of offspring is equal to parent behavior and no genetic variation due to which additive genetic variance is equal to zero. Narrow sense heritability is used to determine the relationship between additive genetic variance with total phenotypic variance.
Narrow-sense heritability = total additive genetic variation / the total phenotypic variation.
A number of mosquito populations today are resistant to specific insecticides, even though those insecticides were highly effective when they were first introduced. Biologists believe that insecticide resistance evolved in mosquitoes because A. a few mosquitoes were probably resistant to the insecticide before it was ever used. These survived and passed that trait on to their offspring. B. mosquitoes needed to develop insecticide resistance to survive after the insecticide was used. C. the presence of the insecticide caused some mosquitoes to develop resistance; they survived and passed the trait to their offspring. D. current mosquito populations are phenotypically variable and exhibit differential fitness in different environments. E. individual mosquitoes built up an immunity to an insecticide after being exposed to it.
Explanation:
Rehashed utilization of a similar class of pesticides to control a bug can cause unwanted changes in the genetic stock of a vermin prompting another type of counterfeit determination, pesticide opposition. At the point when a pesticide is first utilized, a little extent of the bug populace may endure introduction to the material because of their unmistakable hereditary cosmetics These people go along the qualities for protection from the people to come. Resulting employments of the pesticide increment the extent of less-helpless people in the populace. Through this procedure of choice, the populace step by step creates protection from the pesticide. Around the world, in excess of 500 types of bugs, bugs, and arachnids have built up some degree of pesticide oppositionHence, the right answer is option "A"I'm stuck between the answers "A" and "B". Is the answer "B"?
What is the next phase of the carbon cycle for the carbon source labeled C?
Select one:
a. Cellular respiration
b. Photosynthesis
c. Fossil fuels
d. Decomposition
Answer:
The right answer is b. photosynthesis.
Explanation:
Atmospheric carbon is used by plants to make sugars.
Decomposition, fossil fuels and cellular respiration come afterwards.
Which of the following is not a factor that has contributed to agricultural success in the US? A. expansive infrastructure and mechanized equipment B. access to expensive chemical fertilizers and pesticides C. controlled population growth D. the prohibition of hybridized crops Please select the best answer from the choices provided. A B C D
The prohibition of hybridized crops is not a factor that has contributed to agricultural success in the US. The correct answer is D.
Explanation:The correct answer is D. The prohibition of hybridized crops. This has not contributed to agricultural success in the US. Hybridized crops have actually been instrumental in increasing yields and improving crop quality. They are engineered to have desirable traits, such as resistance to diseases and pests, which helps increase productivity and reduce the need for chemical fertilizers and pesticides.
On the other hand, the other options listed - expansive infrastructure and mechanized equipment, access to expensive chemical fertilizers and pesticides, and controlled population growth - have all played crucial roles in agricultural success in the US.
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The correct answer is D. the prohibition of hybridized crops, which has not contributed to agricultural success in the US. Hybridized crops have, in fact, enhanced productivity. Options A, B, and C have all been significant contributors to agricultural success.
The factor that has not contributed to agricultural success in the US is D. the prohibition of hybridized crops. On the contrary, the development and use of hybridized and genetically modified crops have been instrumental in increasing agricultural productivity in the country. This is in contrast to the factors listed in options A, B, and C, which have all played significant roles in the success of US agriculture:
Expansive infrastructure and mechanized equipment (A) have allowed for the efficient planting, cultivation, and harvesting of crops on a large scale.Access to expensive chemical fertilizers and pesticides (B) has enabled farmers to boost yield by supplying essential nutrients and protecting crops from pests and diseases.Controlled population growth (C) has allowed agriculture to meet the dietary needs of the population without overextending the capacity of available farmland and resources.Historically, the Green Revolution introduced numerous agricultural techniques that included the use of inorganic fertilizers, pesticides, and irrigation, alongside the introduction of new grain varieties, which significantly increased output and staved off the Malthusian predictions of overpopulation outstripping food production.
Two species of tree frogs occupy different elevations in the canopy of a rain forest. If these frogs with strikingly different patterns of coloration but similar patterns of activity are brought together, they can produce offspring that survive to adulthood and can then mate successfully with individuals of either species. What keeps these frogs recognizably distinct?
1. Lack of hybrid fertility
2. Temporal isolation
3. Mechanical isolation
4. Habitat Isolation
5. Lack of hybrid viability
Answer:
4. Habitat Isolation
Explanation:
Habitat isolation is a type of prezygotic reproductive barrier or isolation that occurs when two similar populations that can interbreed successfully are prevented from mating with each other as a result of being isolated by habitat. That is, they occupy different habitats. This is what keeps these frogs recognizably distinct.
Individuals should participate in __________ exercises to increase cardiovascular endurance. A. progression B. anaerobic C. overload D. aerobic Please select the best answer from the choices provided. A B C D
Answer:
D
Explanation:
Individuals should participate in that particular type of exercise to increase cardiovascular endurance, which is the aerobic exercise that is present in Option D, and there are various types of the aerobic exercise.
What is the significance of aerobic exercise and its benefits?Aerobic exercise is a type of exercise in which the body's cells, such as muscle cells, get enough oxygen for the work and produce the most energy, whereas anaerobic exercise causes muscle cramps because the oxygen is not properly used. Aerobic exercise helps the cells work fully and maintain cardiovascular endurance, and some examples are dancing, running, etc.
Hence, individuals should participate in that particular type of exercise to increase cardiovascular endurance, which is the aerobic exercise that is present in Option D, and there are various types of the aerobic exercise.
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If you are a colour-blind male (Xc Y) and you have children with a carrier female (Xc X), what percentage of your children could be colourblind OR carriers? ***c means that chromosome has the colourblind gene***
Answer:
0.50% are colour blind and 0.25% are carrier.Explanation:
Colour blindness is a common hereditary condition which is usually passed down from parents to offspring This is a X linked disorder
Given:
male - Xc Y ( color blind)
Female- Xc X ( carrier)
gametes, Xc, Y * Xc , X
F1 generation:
Xc Xc, Xc X, Xc Y, XY
So Xc Xc female and Xc Y male are colour blind because this disease is X- linked recessive disease,
and Xc X female is carrier,
XY male is normal.
What is a primary function of the active site of an enzyme?
What is not evidence that the charophytes are the closest taxon to plants?
Answer:
the presence of chloroplasts
Explanation:
Here is the complete question:.
Which of the following is not evidence that charophytes are the closest algal relatives of plants?
A)similar sperm structure
B)genetic similarities in chloroplasts
C)similarities in cell wall formation during cell division
D)the presence of chloroplasts
E)similarities in proteins that synthesize cellulose
And the answer is
D)the presence of chloroplasts
Compare asexual and sexual reproduction. Place each sentence into the correct box. Amoeba reproduce by dividing into two cells. Cherry trees can be grown from cherry seeds. Pineapple plants can be grown from stem cuttings. Hydras reproduce by budding. Chickens reproduce by laying eggs. Asexual reproduction Sexual reproduction
Answer:
Sexual and asexual reproduction are the defined methods of progeny production.
Explanation:
The process that accounts for the production of the progeny from a single parent is called asexual reproduction. The process of gamete fusion and change in the chromosome number is absent in this process. Some of the well known approach of this process includes binary fission, vegetative propagation and budding.
It includes the following sentences.
Amoeba reproduce by dividing into two cells(via binary fission). Pineapple plants can be grown from stem cuttings.(Vegetative propagation) Hydras reproduce by budding.
The process is sexual reproduction is characterized by the presence of gamete fusion step. The phenotype differentiation illustrates the presence of sexual diamorphism in such organism. In the plant system the formation of seeds is a characteristic of sexual reproduction mainly via pollination.
It includes the following process
Chickens reproduce by laying eggs. Cherry trees can be grown from cherry seeds.Asexual reproduction involves new individuals produced from a single parent organism without gametes, while sexual reproduction involves fusion of gametes from two parent organisms. Amoeba dividing and hydras budding are examples of asexual reproduction, while chicken laying eggs, cherry trees growing from seeds, and pineapple plants growing from stem cuttings are examples of sexual reproduction.
Explanation:In asexual reproduction, new individuals are produced from a single parent organism without the involvement of gametes. An example of asexual reproduction is when an amoeba divides into two cells.
Sexual reproduction, on the other hand, involves the fusion of gametes from two parent organisms to produce offspring. Examples of sexual reproduction include cherry trees growing from seeds and chickens reproducing by laying eggs.
So, the correct comparison would be:
Asexual reproduction: Amoeba reproduces by dividing into two cells and hydras reproduce by budding.Sexual reproduction: Cherry trees can be grown from cherry seeds, pineapple plants can be grown from stem cuttings, and chickens reproduce by laying eggs.Learn more about reproduction here:https://brainly.com/question/2899858
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When looking at graphs showing 800,000 years of past climate data, there is a direct relationship over time between temperature and the concentration of carbon dioxide in the Earth's atmosphere.a.trueb.false
When looking at graphs showing 800,000 years of past climate data, there is a direct relationship over time between temperature and the concentration of carbon dioxide in the Earth's atmosphere is a true statement.
Explanation:
Many paleoclimate studies and research done by observing events like glacial cycles etc over the past 800,000 years about climate changes over the past years have proved the strong linear relationship between temperature and carbon dioxide concentration in the Earth’s atmosphere.
These studies clearly reiterate that when the carbon dioxide concentration in the atmosphere increases, the temperature also increases; and when the CO2 concentration decreases, the temperature also decreases. Carbon dioxide also controls the amount of greenhouse gases in the atmosphere by controlling the temperature.
Increased CO2 levels increases temperature which in turn will increase the evaporation of greenhouses gases present in the atmosphere including CO2 from the reservoir; however, the CO2 can stay in the atmosphere for very long time. All of these factors have led to various climate changes globally .
While cleaning the leaves from a sheltered flowerbed, I observed a small patch of brightly colored, yellow/orange stuff apparently growing on some rotting wood. Taking a sample to my lab, I discover that the stuff is alive and coenocytic (is comprised of a single mass of cytoplasm undivided by membranes and contains many nuclei). The organism that I have found is most likely ___.
Answer:
plasmodial slime mold
Explanation:
The organism that best fits this description is a plasmodial slime mold. They are a group of eukaryotic organisms that can either live singly or in colonies.
They are basically single celled organisms with several nuclei aggregating in a mass. When several flagellated cells fuse together, they yield a single cytoplasm with several nuclei. They feed on micro-organisms and are ubiquitous in nature.Thyroid hormone is essential for the synthesis of β adrenergic receptors; therefore, in the absence of thyroid hormone, epinephrine cannot trigger bronchodilation. This concept is known as __________.
Explanation:
In endocrinology, tolerance is a biochemical wonder wherein the nearness of one hormone is required all together for another hormone to apply its full consequences for an objective cell. Hormones can communicate in lenient, synergistic, or hostile ways. glycoproteins,steroids, polypeptides and amines are the chemical classes of hormone.Permissive hormones are precursor to active hormones and are called as prohormones or prehormones.A scientist wants to change the DNA of a sexually reproducing organism and have the new DNA present in every cell of the organism. In order to do this after fertilization, she would change the DNA in the:_______1. Zygote2. Placenta3. Testes of the father4. Overies of the mother
Answer:
The correct answer is 1. zygote
Explanation:
Zygote is formed after the fertilization of male and female gametes. So zygote is the first cell that is produced after the fertilization step. Zygote contains DNA from male and female parents and the DNA divides as the zygote divides by mitosis.
So zygote is cell in which the DNA should be changed to provide the new DNA to every cell because the zygotic cell will divided and give rise to other cells in the organism. So the correct answer is 1.
"What is the life-threatening systemic condition that can develop when an infection, like an abscess with surrounding cellulitis, moves into the bloodstream?"
Answer:
kvhbehfrb
Explanation:
,wnr ekv
The hormone epinephrine binds to ß adrenergic receptors on smooth muscle cells of the bronchioles, causing them to dilate (increase in diameter). Thyroid hormone is essential for the synthesis of ß adrenergic receptors; therefore, in the absence of thyroid hormone, epinephrine cannot trigger bronchodilation. This concept if known as __________.
Answer:
The correct answer is "permissiveness".
Explanation:
The missing options of the question are:
permissiveness
synergistic effect
antagonism
additive effect
The correct answer is "permissiveness",
In biology, a permissive effect is defined as the effect that one hormone has enabling that a second hormone to exert its biological activity. Thyroid hormone has a permissive effect on the hormone epinephrine, by synthesizing ß adrenergic receptors, it enables the hormone epinephrine binds to them and cause the cells of the bronchioles to dilate.
Answer:
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Explanation:
A researcher was studying mutations in bacteria. He found that certain bacteria had changes in their DNA that allowed them to be resistant to antibiotics. This research is an example of 1._______The mutation will lead to 2.________.
1.
A.Embryology
B. Evolution Genetics
C.Comparative Anatomy
2.
A. All the bacteria becoming resistant to the specific Antibiotics
B. The Bacteria becoming nonresistant to specific Antibiotics
C. Less Bacteria becoming resistant to the specific Antibiotics
Explanation:
Evolution genetics is a field of science, which includes the study of genetic variations that lead to evolutionary changes in organisms As some bacteria had changed their DNA that led to the development of antibiotic resistance in themDue to antibiotic resistance, certain bacteria, in which changes in DNA take place, become resistant against some type of antibiotics and those antibiotics are no longer effective to prevent or kill them Hence, the right answer is option 1 B and 2 C " evolution Genetics & less bacteria becoming resistant to the specific antibiotics"The threshold on a dose-response curve is the:_______.
a. point at which the dose of the drug causes maximal response.
b. lowest dose at which there is an observable effect of the drug.
c. safe effective dose of the drug.
d. therapeutic index of the drug.
Answer:
B. lowest dose at which there is an observable effect of the drug
Answer:
b. lowest dose at which there is an observable effect of the drug.
Explanation:
If an organism is exposed to a particular dose(concentration) of drug or chemical for a period of time, and one needs to measure the extent or degree of exposure from level of response of the organism to the dose,( to determine the potency, or adverse effect of the drug) the term used to describe this procedure is called dose-response relationship.
If it is possible to graph the the( log )dosage of the drug on( the x-axis) against the percentage response of the organism involved(on the y-axis), then it is possible to obtain a graphical representation of the magnitude of the response to the drug dosage in a Sigmoid curve shape. This representation is called dose-response curve.
Generally in most cases small doses of drugs do not produce toxic effects; however as dose increases, toxicity increases.However the minimum dose(drug concentration) at which toxicity first appears, that is where observable effects of the drug first noticed based on the response is called Threshold.
What is a possible outcome of persistent geographical isolation of two populations?
Answer: Allopathic speciation could occur.
Explanation:
WILL BE MARKED AS BRAINLIEST
The ovaries and testes produce sex hormones in response to _____
a. moon cycles
b. posterior pituitary
c. the adrenal glands
d. follicle-stimulating hormone and luteinizing hormone
e. lipase
Answer:
Explanation:
option d
Answer:
The ovaries and testes produce sex hormones in response to follicle-stimulating hormone and luteinizing hormone
Explanation:
Follicle-stimulating hormone and luteinizing hormone, when both hormones are activated the testes and ovaries are prepared or alerted to produce sex hormones
Suppose an experimenter becomes proficient with a technique that allows her to move DNA sequences wil prokaryotic genome.If she moves the promoter for the lac operon to the region between the beta galactosidase (lacz) gene and the permease (lacy) gene, which of the following would be likely? A) RNA polymerase will no longer transcribe permease. B) The cell will continue to metabolize but more slowly. C) The operon will no longer be inducible. D) Beta galactosidase will not be produced. E) The three genes will be expressed normally.
Answer:
D) Beta galactosidase will not be produced.
Explanation:
Promoter is necessary to start the transcription of the structural gene. The position of promoter is important because the gene which is downstream to promoter will be transcribed and the gene upstream to the promoter will not be transcribed.
Lac operon has three structural gene lacZ, lacY, and lacA. Lac Z codes for β galactosidase, lac Z codes for permease and Lac A codes for transacetylase. So if promoter for the lac operon moves between the beta-galactosidase (lacz) gene and the permease (lacy) gene, then the beta-galactosidase gene will not be produced because it is places upstreamed to the promoter.
The hormone that initiates the development of specialized cells in the ovaries of women and triggers androgen production by the testes of men is _____.
Answer:
luteinizing hormone.(LH).
Explanation:
Luteinizing hormone specially stimulates cells in the seminiferous tubules to particularly secrete testosterone, which has a role in sperm production and developing male secondary sex characteristics.
In the disease known as ________________, the heart cannot distribute enough blood throughout the body to reach the major organs, causing the tissues to swell with fluid.
Answer:
Congestive heart failure occurs when the heart cannot distribute enough blood throughout the body to reach the major organs, causing the tissues to swell with fluid.
Explanation:
In examining a protist, you notice that it lacks a cell wall, and has movement with cytoplasmic streaming. These data allow you to infer that the species belongs to which of the following protist groups? In examining a protist, you notice that it lacks a cell wall, and has movement with cytoplasmic streaming. These data allow you to infer that the species belongs to which of the following protist groups? A) Rhizaria B) Stramenopila C) Alveolata D) Excavata E) Amoebozoa
Explanation:
Amoebozoa refers to a large group of microorganisms that do not form tissues and can alter their shape. The amoebozoans all have a tube or lobe-shaped pseudopods. That's one of the ways we classify themNow, with roughly 2,400 different species, the amoebozoans take up a lot of space on this planet. I mean, not literally they're pretty small but they are important parts of many ecological systems. So let's get to know them. They're the closest to monstersHence, the right answer is option E "Amoebozoa"
A structural gene is Choose one: A. a string of nucleotides that can be decoded by an enzyme to produce a protein. B. an organism’s entire genetic complement of DNA. C. a string of nucleotides that can be used as a template to produce an RNA that codes for a protein. D. an enzyme involved in the conversion of DNA into RNA.'
Answer:
C. a string of nucleotides that can be used as a template to produce a RNA that codes for a protein.
Explanation:
A gene is a specific sequence of DNA containing genetic information required to make a specific protien and is a string of nucleotides (DNA in cells) that can be used as a template to produce a RNA (by transcription) that codes for a protein. The produced RNA might be the end product (for example some transfer RNA's) or might be further translated into a protein. An organism's entire complement of DNA is its genome.
Final answer:
A structural gene is a sequence of DNA that acts as a template for producing an RNA molecule which is then translated into a protein (option C). During transcription, this gene is copied into mRNA which encodes for the protein.
Explanation:
A structural gene is C. a string of nucleotides that can be used as a template to produce an RNA that codes for a protein. In the process known as transcription, only one strand of the double-stranded DNA is copied into messenger RNA (mRNA). The mRNA then serves as a guide for assembling amino acids in the correct sequence to produce a protein. The strand of DNA that is used during transcription is referred to as the template strand, and the mRNA sequence is complementary to this strand. This transcription process is critical as it begins the pathway of converting genetic information from DNA to RNA, and ultimately to a functional protein.
Fts proteins are essential for bacterial cell division because they __________.
a. are involved in peptidoglycan synthesis
b. are involved in the pulling apart the two copies of the chromosome c. are involved in the forming of the divisome
d. All of the listed responses are correct.
Answer:
c. are involved in the forming of the divisome
Explanation:
Angiosperms, or flowering plants, have a life cycle characterized by an alternation of generations, meaning that there are two different multicellular forms: one haploid form and one diploid form. In addition to the alternation of generations, other aspects of the angiosperm life cycle, including pollination, fertilization, and seed development, have enabled flowering plants to populate and thrive in a variety of environments.1. True2. False
Answer:
All of the above mentioned is true for the angiosperm. The flowering plants are otherwise known as angiosperms. The presence of flowers, endosperm present inside a seed, and a seed containing fruit are the distinguishing features of the angiosperms
Explanation:
Alternation of generations is a type of life cycle that is characterized by the presence of both the haploid and the diploid stage. The former stage is sexual and the latter is asexual in nature. The haploid gametophyte is formed via haploid spores undergoing the process of mitosis.
The process of pollination establishes pollination by the transfer of the male part of the flower to the female part that is known as the pollen and ovary respectively. In the angiosperms the landing of the pollen grain to the stigma eventually forms the pollen tube that reaches the ovary. The process of pollen transfer takes place via wind, water or pollinators. Also the process of homologous recombination adds to the genetic diversity thereby helping the plants to adapt to variety of environmental conditions.
Polydactylism is a dominant trait that results in extra fingers and toes in humans. A polydactyl man marries a woman with 10 fingers and toes. They have a child that has a normal number of digits. The phenotype of the man's father is unknown, but his mother has a normal phenotype. What are the genotypes of the married couple? .
Final answer:
The genotypes of the married couple could be either Polydactyl (PP) or Heterozygous (Pp) for the man, and Normal (pp) for the woman.
Explanation:
To determine the genotypes of the married couple, we need to consider the information given in the question. The condition of polydactylism is stated to be a dominant trait in humans. This means that individuals who have the gene for polydactylism will express the trait and have extra fingers and toes. Since the child of the couple has a normal number of digits, it indicates that they do not have the gene for polydactylism.
From this information, we can conclude that the woman with 10 fingers and toes does not have the polydactylism gene, as she would have expressed the trait if she did. The man, who has polydactylism, must have inherited the gene from one of his parents. However, the phenotype of his father is unknown, meaning we cannot determine his genotype with certainty. It is possible that the man's father does not have the gene for polydactylism, and the man inherited it from his mother.
Therefore, based on the given information, the possible genotypes of the married couple are:
Man: Polydactyl (PP) or Heterozygous (Pp)
Woman: Normal (pp)