The best way to ensure that results of a study are generalizable to a population is by using a random selection of people in that population
The goal of every research experiment is to obtain results that are generalizable to a whole population.
This is achieved by the method of random selection. In random selection, members of the of the population are selected in such a way that is representative of the entire population. If for instance, I want to study a school having six classes which comprises of boys and girls. There are 700 students in the school and I need only 180 students to participate in a study whose results will be extrapolated to all the 700 students. I can decide to randomly select 15 boys and 15 girls from each class to participate in the study. This is an example of random selection.
In this way, the results obtained from the study is reflective of the whole population even though only a sample of the population actually participated in the study.
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A 53 year old man presents with increasing gastric pain and is found to have a 3 cm mass located in the anterior wall of his stomach. This mass is resected and histologic examination reveals a tumor composed of cells having elongated, spindle-shaped nuclei. The tumor does not connect to the overlying gastric epithelium and is instead found only in the wall of the stomach. The tumor cells stain positively with CD117, but negatively with both desmin and S-100. Special studies find that these tumor cells have abnormalities of the KIT gene. Which of the following is the most likely diagnosis?
a. Lymphoma of mucosa-associated lymphoid tissue (MALToma)
b. Ectopic islet cell adenoma (VIPoma)
c. Gastrointestinal stromal tumor (GIST)
d. Submucosal leiomyoma ("fibroid tumor")
e. Nonchromaffin paraganglioma (chemodectoma)
Answer:
The correct answer is c. Gastrointestinal stromal tumor (GIST)
Explanation:
Gastrointestinal stromal tumors (GIST) are rare neoplasms that originate from mesenchymal cells, generally express the KIT receptor (CD117) and present activated mutations of the tyrosine kinase or tyrosine kinase receptor proto-oncogene, cKIT (it is the gene that encodes KIT protein synthesis). GISTs can be located in any portion of the wall of the GI tract, but most are located in the submucosa or in the muscularis propria. Some are predominantly extramural; large ones can infiltrate neighboring organs
A gastrointestinal stromal tumor (GIST) is the most likely diagnosis (Option C).
Cancer is a multifactorial disease in which cancer cells divide and proliferate to produce a tumor.Cancer is often associated with mutations in key genes which are required for the normal functioning of a given tissue (e.g. cell cycle genes).A gastrointestinal stromal tumor (GIST) is a tumor in which cells of the stomach proliferate in an uncontrolled manner.In conclusion, a gastrointestinal stromal tumor (GIST) is the most likely diagnosis (Option C).
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Alguien me puede explicar
Yes, because if two samples come from the same individual, all the bands of one sample must coincide with all the bands of the other. Compare the bands in each sample and determine if any of the suspects left the blood found at the crime scene.
"Ancient Greek Myths for Kids: The Story of King Midas and the Golden Touch - Ancient Greek Myth for Kids" https://greece.mrdonn.org/greekgods/kingmidas.html
Answer:
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Is there anything you need help with which is based on the story?
Steven wants to decorate his office surroundings with different ornamental plants. Which professional should Steven consult? ОА soil scientist OB. biotechnologist OC. horticulturists OD. agricultural engineer
Answer: the correct option is C (horticulturists)
Explanation:
ORNAMENTAL PLANTS are defined as those plants that has outstanding and unique flowers, fragrance an interesting shape, colorful or unusual bark, excellent fall color, or a combination of these and other features. While some of these plants add framework and structure to the garden and provide at least a little shade.; others also make great background plants for shrub and flower borders.
HORTICULTURISTS are individuals that deals with the aspect of agriculture which involves the cultivation of plants, vegetables, fruits, flowers, herbs, ornamental trees, maintaining nurseries, gardens, orchards and plantations. To be more specific, ornamental horticulturist are those that works with plants used in decoration or recreation, which is mostly done at a nursery, floral shop, landscaping or office surroundings.
what measure against mosquitoes is least harmful to the environment
Answer:
Eliminate standing water in rain gutters, old tires, buckets, plastic covers, toys, or any other container where mosquitoes can breed. Empty and change the water in bird baths, fountains, wading pools, rain barrels, and potted plant trays at least once a week to destroy potential mosquito habitats.
The phenomenon of single or double fertilization is unique to the seed plants
Answer:
Double fertilization
Explanation:
The phenomenon of double fertilization is unique to flowering plants (i.e., angiosperms). Each pollen grain produces two male gametes (sperm cells), one of which fertilizes the egg to form the zygote, whereas the other sperm fuses with polar nuclei in the female gametophyte in order to form a triploid cell (3n) called endosperm. Subsequently, this endosperm will support embryonic growth by supplying storage nutrients and by serving as a mechanical barrier during seed development and germination.
Humans are diploid; every individual carries only two alleles.
a. True
b. False
Why can't we meet all of our protein needs in one meal?
Because most people go for what tastes good rather than what is protein rich, and what tastes good is usually high in fat and carbohydrates, as opposed to proteins.
Sperm is produced in the?
Answer:
testis
Explanation:
produced from the testicals
Answer:
testis
Explanation:
produced from the testicals
The function of the placental hormone human placental lactogen (hPL) is to ________. Question 12 options: prepare the breasts for lactation nourish the placenta regulate the menstrual cycle help the placenta to mature All of the above are true.
Answer:
nourish the placenta
Explanation:
The hormone called human placental lactogen (hPL) is a hormone secreted by the placenta, which functions to supply nutrients and oxygen to the growing fetus in the womb.
The human placental lactogen is produced to help in the efficient use of ingested food substances in the production of energy (metabolism). This indirectly helps to nourish the placenta because if the mother efficiently converts food into nutrients, the placenta is also adequately nourished.
I need help please
Are mutations always harmful? Why or why not?
Answer: Mutational effects can be beneficial, harmful, or neutral
Explanation:
Most non-neutral mutations are deleterious. In general, the more base pairs that are affected by a mutation, the larger the effect of the mutation, and the larger the mutation's probability of being deleterious.
"nature.com"
As regards the use of animal models,
Select one:
a.
Animals can model anything in the realm of human psychology
b.
The rat brain is completely different from a human brain in its neuroanatomy
c.
The 5-choice serial reaction time task is a way to operationalize spatial memory and spatial learning
d.
Rats can drive little cars
e.
All of the other answers are correct
Answer:
b number is the answer is it ok
Explain the self-correcting nature of science.
The notion of a self-correcting science is based on the naive model of science as an objective process that incorporates new information and updates beliefs about the world depending on the available evidence. When new information suggests that old beliefs are false, the old beliefs are replaced by new beliefs.
Sponges (phylum: Porifera) are animals that possess feeding cells called collar cells. These cells have a central flagellum surrounded by a collar of microvilli. The collar filters organic matter out of the water column. Which protist shares a more recent common ancestor with the poriferans
Answer: Choanoflagellates
Explanation:
Protists are organisms that have both plant and animal like characteristics. Some protists develop more plant like characteristics and others more animal like characteristics. Choanoflagellates are the protists which looks like animals called sponges. These protists are single celled organisms. Their function is similar to collar cells of the sponges that is they produce current in water that draws water and food particles via the body of sponges and they filter the food particles through their microvilli.
In the absence of oxygen, the pyruvic acid produced during
glycolysis is converted to co, and A. water B glycerol.ethanol
D. citric acid
Answer:
B. Ethanol
Explanation:
During absence of O2 pyruvic acid is reduced to ethanol in alcoholic fermentation.
Answer:
its is converted into co andoption .C Ethanol
write a documentary on journey of corona virus
Answer:
at this situation we need to take care of ourselves
because we know that it's disease which leads us to death
There are a lot of cells and tissues that support the developing embryo. How do you think this changes if the mother is a litter bearing animal such as cat, dog or mouse? (be sure to provide references to defend your answer
Answer: The cells and tissues support embryonic development in mammalian offsprings as these cells have the capacity to divide and differentiate.
Explanation:
Since the time from copulation till delivery of fetus several changes occur in the body of the mammalian mother including animals like cat, dog, and mouse to support the pregnancy. There are specialized totipotent cells which are proliferating specialized cells they have tendency to divide quickly and differentiate into functional types so that they can become a specialized organ or part of the body. If take an example of human which is also mammal in mother body after conception the egg gets fertilized to form sperm which changes to embryo the embryo divides and differentiate to form blastocysts and further divides and differentiate in several stages to become fetus.
Identify the eicosanoid.
a.
Vitamin D.
b.
Cholesterol.
c.
Sex hormones.
d.
Thromboxanes.
e.
Bile salts.
Answer:
The eicosanoids are a family of oxygenated derivatives of 20-carbon polyunsaturated fatty acids that includes prostaglandins, thromboxanes, leukotrienes, endocannabinoids, and isoecosanoids.
You find a neuron that is releasing acetylcholine onto a muscarinic receptor on its target cell. When you trace the axon back to the spinal cord, you see that it is part of the nerve coming from the upper regions of the spinal cord. Based on its anatomy, you should classify this neuron as
Answer:
parasympathetic.
Explanation:
This neuron in the question is a parasympathetic type of neuron that releases the acetylcholine onto the target cell. It is the part of the nerve coming from the upper regions of the spinal chord.
The [tex]\text{parasympathetic}[/tex] nervous system mainly is composed of the cranial spinal nerves and the [tex]\text{sacral spinal nerves}[/tex]. The preganglionic neurons that arises from the brain or from the sacral spinal cord.
Therefore, the correct answer is "parasympathetic" neuron.
Below is an image of a nucleus before it divides via meiosis. The chromosomes shown in red are from the female parent, and the chromosomes
in blue are from the male parent. Predict the gametes that can be created from this organism and explain the reason these different gametes are
possible.
Answer:
I predict that the gametes will be unique from their parents.
Explanation:
I predict that the chromosomes will pair up, with each pair having a red chromosome and a blue chromosome, then they'll cross over and exchange similar genetic information with each other. I think this because variety is important for any species for survival.
A. Look carefully the next image, label its parts with the words from the box: SPINAL CORD CEREBRUM CEREBELLUM PERIPHERAL NERVES BRAIN STEM
No
You're welcome please give brainliestLittle Hazel had a painful cavity filled the last time she was at
the dentist. The next dental visit, she begins to cry when the
dental assistant walks out and calls her name. Provide a
rationale for her behavior based on classical conditioning
principles. Be sure to use behavioral terms in your answer
(US, UR, NS, CS, and CR should be identified for full credit).
Answer:
UCS=US=unconditioned stimulus. UCR=UR=unconditioned response. CS=conditioned stimulus. CR=conditioned response. NS=neutral stimulus.
on a molecular level why does lifting weights consume energy
Answer:
to contract a muscle, myosin and actin filaments shorten, requiring ATP binding and hydrolysis
Explanation:
hopes it help
1) Explain how trees cool the environment ??
Answer:
Trees cool the environment by shading small areas.
is pawpaw a local food crop
Answer:
Pawpaw means papaya. Hope you'll get some clues from here
one way viruses may be spread from person to person
Answer:
virus spreads mainly between people who are in close contact with each other, typically within 1 metre. A person can be infected when aerosols or droplets containing the virus are inhaled or come directly into contact with the eyes, nose, or mouth.
Explanation:
This is the correct answer I hope this helps you out a little.
Checkpoint proteins at the G1, G2, and M phases of the cell cycle monitor whether crucial cellular process have been completed correctly and the cell cycle can proceed. A mutation in a checkpoint protein can lead to cancer by resulting in the checkpoint protein not functioning properly. Which of the following could be a result of the improper functioning of a checkpoint protein in a cancer cell?
a. Cell division stops.
b. The cell reverts to interphase.
c. There is uncontrolled cell division.
d. The cell dies.
Answer:
c. There is uncontrolled cell division.
Explanation:
There is uncontrolled cell division that result in the improper functioning of a checkpoint protein in a cancer cell because checkpoint protein monitors and control the the process of cell cycle. If mutation occurs in this checkpoint protein, the cycle is no longer in control which leads to the uncontrolled cell division and we also know that cancer is a disease which occurs due to uncontrolled division of the cell.
What differences would you expect to see in a population made up of individuals whose chromosomes experience crossing-over frequently compared with a population made up of individuals whose chromosomes do not cross over? Please explain your reasoning.
Explanation:
Crossing over is a type of recombination that occurs during prophase I of meiosis and results in the exchange of genetic material between homologous chromosomes. In a population where crossing over occurs frequently, there would be increased gene pool or genetic drift and variations compared to a population where individual chromosomes do not cross over. The offspring will be genetically unique because of crossing over and independent assortment.
que es atomo y cuales son sus componente :3 rapido
Answer:
átomo es la unidad constituyente más pequeña de la materia que tiene propiedades de un elemento químico.[1] Cada sólido, líquido, gas y plasma se compone de átomos neutros o ionizados. Los átomos son microscópicos; los tamaños típicos son alrededor de 100 pm (diez mil millonésima parte de un metro).[2] No obstante, los átomos no tienen límites bien definidos y hay diferentes formas de definir su tamaño que dan valores diferentes pero cercanos. Los átomos son lo suficientemente pequeños para que la física clásica dé resultados notablemente incorrectos. A través del desarrollo de la física, los modelos atómicos han incorporado principios cuánticos para explicar y predecir mejor su comportamiento
Explanation:
El átomo contiene protones, neutrones y electrones, con la excepción del átomo de hidrógeno-1, que no contiene neutrones, y del catión hidrógeno o hidrón, que no contiene electrones. Los protones y neutrones del átomo se denominan nucleones, por formar parte del núcleo atómico.
Question 7(Multiple Choice Worth 4 points)
(01.03 MC)
The evolution from vesicles to true cells was enabled by the development of
A) a membrane separating the cell from its environment
organic molecules, such as carbohydrates and lipids
B) self-replicating molecules, such as RNA and DNA
Thing
C) inorganic molecules, such as nitrogen and oxygen
Answer: The correct option is B (self-replicating molecules, such as RNA and DNA)
Explanation:
The current theory of the process of evolution makes use of present day knowledge of genes and chromosomes to explain the source of genetic variation upon which natural selection works. These genes are discrete units of inheritance which determine hereditary characteristics. All the information for the inheritable characteristics of an individual are contained in these genes.
When a cell divides, the genes duplicate themselves so that each daughter cell has an identical set of genes as the original parent cell. These genes are passed from parents to offspring in the gametes of the parents.
Gene are found in the DNA( Deoxyribonucleic acid) molecules or RNA (Ribonucleic acid) molecules. These molecules are capable of self replication due to a process called mutation. Mutations are random changes in DNA that alter genetic information and sin introduce new characteristics. They may occur
--> in body cells or
--> during gamete formation.
Thus, evolution from vesicles to true cells is through self replicating molecules through the process of mutation which is the raw material for evolution
Answer:
B (self replicating molecules such as RNA and DNA)
Got it right on the bio test.
