When doing medical research with human subjects, which four limitations are unavoidable?
It’s often impossible to repeat trials on the same subjects.
Subjects may report an inaccurate medical history.
It can be difficult to control all possible variables.
It’s impossible to come up with testable scientific questions for human subjects.
There are ethical or privacy concerns to consider.
Answers
In medical research with human subjects, four limitations are unavoidable A, B, C, E.
What is medical research with human subjects?An example of medical research is one that incorporates elements of biology, chemistry, and pharmacology.
The following are some restrictions on medical research using human subjects:
Trials on the same subjects can frequently not be repeated.
Subjects could give a false medical history.
Trying to manage every potential variable might be challenging.
There are ethical and privacy issues to take into account.
Therefore, human subjects include inaccurate medical histories, and repeat trials, hence option A, B, C, and E are correct.
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Answer:
It’s often impossible to repeat trials on the same subjects.
Subjects may report an inaccurate medical history.
It can be difficult to control all possible variables.
There are ethical or privacy concerns to consider.
Explanation:
Related Questions
Explain how DNA fragments are separated by gel electrophoresis
Answers
Gel electrophoresis is a widely used technique in molecular biology that allows for the separation of DNA fragments based on their size and charge.
The process involves several steps:
Preparation of the gel: A gel matrix, usually made of agarose or polyacrylamide, is prepared and poured into a gel tray. Small wells are created at one end of the gel, which will hold the DNA samples.
Loading the samples: DNA samples, which have been treated with restriction enzymes to generate fragments of different sizes, are loaded into the wells of the gel.
Applying an electric field: The gel tray is immersed in a buffer solution, and an electric field is applied across the gel. One end of the gel serves as the positive electrode (anode), and the other end as the negative electrode (cathode).
Migration of DNA fragments: When the electric field is applied, negatively charged DNA fragments migrate through the gel towards the positive electrode. Smaller fragments move more quickly through the gel matrix, while larger fragments move more slowly.
Visualization of DNA bands: After the electrophoresis is complete, the DNA fragments are visualized using stains or fluorescent dyes. The bands formed on the gel represent the separated DNA fragments, with each band corresponding to a specific size.
By analyzing the position and intensity of the DNA bands, researchers can determine the size of DNA fragments and gain insights into various genetic phenomena, such as gene mapping, DNA sequencing, and genetic variation analysis.
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true or false If the marginal rate of substitution is not
diminishing, it must mean that tastes violate convexity (assuming
that our other assumptions about tastes hold).
Answers
The statement is false. The MRS can be constant or increasing without violating convexity, as other factors and assumptions about tastes need to be considered.
The statement "If the marginal rate of substitution is not diminishing, it must mean that tastes violate convexity" is false. The marginal rate of substitution (MRS) measures the rate at which a consumer is willing to give up one good in exchange for another while maintaining the same level of satisfaction. In general, the MRS tends to diminish as the consumer consumes more of a particular good.
However, the violation of convexity in preferences does not necessarily imply that the MRS is not diminishing. Convex preferences refer to a situation where the consumer prefers a diverse combination of goods rather than extreme combinations. It implies that the consumer values variety and has diminishing marginal utility for each good consumed.
Therefore, even if the MRS is not diminishing, it does not necessarily mean that tastes violate convexity. Convex preferences can still be present even if the MRS remains constant or increases. The relationship between the MRS and convexity is not direct, and it is important to consider other factors and assumptions about tastes to determine if convexity is violated.
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The conducting zone includes all of the following except: A. Larynx
B. Trachea
C. Bronchi
D. Terminal bronchioles
E. Respiratory bronchioles
Answers
The conducting zone refers to the anatomical structures of the respiratory system that are involved in the passage and transportation of air. The correct answer is E. Respiratory zone
The conducting zone refers to the portion of the respiratory system that conducts air from the external environment to the respiratory zone where gas exchange occurs. It includes the structures responsible for air transport and conditioning but does not participate directly in gas exchange.
The primary function of the conducting zone is to warm, humidify, and filter the inhaled air before it reaches the delicate respiratory surfaces.
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Which molecule has both hydrophilic and hydrophobic properties and would be found in plasma membranes?A) 1B) 5C) 6D) 12E) 14
Answers
A) 1 The molecule that has both hydrophilic and hydrophobic properties and would be found in plasma membranes is phospholipids.
Phospholipids are a type of lipid molecule that are a major component of cell membranes. They are made up of a hydrophilic (water-loving) head and two hydrophobic (water-fearing) tails. The hydrophilic head is made of a phosphate group, while the hydrophobic tails are made of fatty acids.
In a plasma membrane, phospholipids are arranged in a bilayer, with the hydrophilic heads facing outwards towards the aqueous environments inside and outside of the cell, and the hydrophobic tails facing inwards. This arrangement allows for the selective permeability of the plasma membrane, as only certain molecules can pass through the hydrophobic interior of the membrane.
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organisms that need to maintain turgor pressure.. group of answer choices should first become flaccid should be in a hypertonic solution should be in a hypotonic solution should be in an isotonic solution
Answers
Turgor pressure, which affects bacteria, fungus, and plants, often results from the osmotic movement of water. Additionally, protists with cell walls exhibit the phenomena.
What substance does a cell wall consist of?Plant cells have a cell wall that encloses the plasma membrane and provides tensile strength as well as protection from osmotic and mechanical stress. As a result, cells may experience turgor pressure, which is the force of cell's contents pushing it against cell wall.
How are cell walls constructed?The middle lamella as well as the primary cell wall are the two layers that make up all cell walls, and many cells also develop a third layer known as the secondary wall. Between the major walls of neighboring cells, the middle lamella acts as a securing layer.
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the triads of a muscle fiber consist of __________.
Answers
A triad is made up of three notes stacked in subsequent thirds. A triad is also known as a harmony or a chord. (Chord progressions are another example of harmony.) The root is the lowest note of a triad when it is stacked in thirds.
What the triads of a muscle fiber posses?The terminal cisterna, T-tubule, and sarcoplasmic reticulum are the three structures that surround the myofibrils and make up the triad.
Therefore, Actin and myosin, two protein structures, are found in the myofibrils. In a muscle cell, the sarcomere serves as a structural and functional unit.
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FIRST GETS BRAINLIEST so hurry
Answers
Answer:
Your answser should be C
Explanation:
Answer:
c
Explanation:
Aekoz is allowed to play video games for 6/3 hours each day . she already played for 4/3 hours today. what fraction of a hour has aekoz have left to play video games today. show your work
Answers
Aekoz has 40 minutes remaining to play video games today, which is equivalent to 2/3 of an hour.
Operations with fractionsTo find out how much time Aekoz has left to play video games today, we need to subtract the time she has already played from the total allowed time.
Total allowed time: 6/3 hours
Time played: 4/3 hours
Aekoz has 2/3 of an hour left to play video games today.
To subtract fractions with the same denominator, follow these steps:
Identify the denominator: Confirm that the fractions you are working with have the same denominator. If they don't, you'll need to find a common denominator before proceeding.Subtract the numerators: Subtract the numerator of the second fraction from the numerator of the first fraction. Write down the result.Keep the denominator unchanged: The denominator remains the same since both fractions have the same denominator.Simplify, if necessary: If the resulting fraction can be simplified, simplify it by finding the greatest common divisor (GCD) of the numerator and denominator and dividing both by it.Write the final answer: Write the resulting numerator over the common denominator to represent the difference between the fractions.learn about what are fractions
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Does the ability of a mycobacterium tuberculosis cell to infect a new host depend on its drug-resistant phenotype?.
Answers
No, because it does not affect the ability to infect another host. Drug-susceptible cells can be stopped in presence of the medication.
What is drug susceptibility?Drug susceptibility refers to the susceptibility to drugs of choice for particular infections (in this case, Mycobacterium tuberculosis).
The drug susceptibility/resistance does not affect the ability of infected cells to infect another host.
However, it is important to highlight that drug resistance increases the chances that a resistant cell has to spread the infection.
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a lin-3 loss-of-function mutant with a vulva-less phenotype was mutagenized. based on your knowledge of the genetic pathway, what types of mutations will suppress the vulva-less phenotype?
Answers
A mutation in let-23 or in any downstream genes in the lin-3 pathway can suppress the vulva-less phenotype in the lin-3 loss-of-function mutant.
The lin-3 pathway is responsible for inducing vulval development in C. elegans. In a lin-3 loss-of-function mutant, vulval development is suppressed, resulting in a vulva-less phenotype. However, mutations in let-23 or in any downstream genes in the lin-3 pathway can suppress this phenotype. Let-23 is a receptor tyrosine kinase that acts downstream of lin-3 to activate the ras/raf/MAPK pathway, which ultimately leads to vulval induction.
Mutations in let-23 or any of the downstream genes in this pathway can bypass the need for lin-3 and still induce vulval development. Thus, a lin-3 loss-of-function mutant with a vulva-less phenotype can be rescued by mutations in let-23 or downstream genes in the lin-3 pathway.
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- What is a bone marrow transplant?
Answers
Answer:
A bone marrow transplant is a medical procedure performed to replace bone marrow that has been damaged or destroyed by disease, infection, or chemotherapy. This procedure involves transplanting blood stem cells, which travel to the bone marrow where they produce new blood cells and promote growth of new marrow.
Explanation:
Answer:
A bone marrow transplant introduces healthy blood-forming cells from a donor into the patient's bloodstream, where they begin to develop and produce healthy red blood cells, white blood cells, and platelets. To prepare their bodies for the transplant, patients are given high doses of chemotherapy.
William discovered that two modern-day species have very similar dna. he concludes that the two species are closely related. what type of evidence did william most likely use to reach his conclusion
Answers
William discovered that two modern-day species have very similar DNA. he concludes that the two species are closely related. William most likely used genetic evidence to reach his conclusion.
Change in the heritable traits of biological populations over multiple generations is referred to as evolution. These traits are genetic expressions passed from parents to offspring during reproduction. Evolution is the process by which animals adapt to a changing environment over time.
Changes in heritable traits—an organism's hereditary characteristics—cause evolution in organisms. Eye colour, for example, is an inherited feature in humans, and a person may acquire the "brown-eye trait" from one of their parents. Evolution is significant because it explains how life evolved on Earth and how various species are related to one another. Natural selection is thought to be the primary process causing population evolution.
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A plant specimen has seeds that are enclosed by a fruit. which type of plant is it?
Answers
Angiosperms are plant specimen that has seeds that are enclosed by a fruit.
What are angiosperms?Angiosperms are well-defined plants with stems, roots, and leaves.They are vascular plants ( they have xylem and phloem tissues to transport water minerals throughout the body).Their seeds are enclosed in fruit and include flowering plants.Hence, "Angiosperms" is the correct answer.
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Read the scenario and examine the table.
Ivan wants to test how the amount of water consumed each day affects the number of facial blemishes people receive over a month. He gathers 12 people and divides them into 3 groups. He keeps everything the same for each group except for daily water and food intake. Throughout the month, Ivan tallies the number of facial blemishes each individual receives. The table details how Ivan changed the independent variables for each group.
Note: Group 1 is Ivan's control group.
What error did Ivan make in the design of his investigation?
A.) Ivan did not record the results for the dependent variable in a data table.
B.) Ivan did not determine the average number of blemishes received.
C.) Ivan tested more than one independent variable at a time.
D.) Ivan had the individuals in the control group consume water.
Answers
The answer is C.) Ivan tested more than one independent variable at a time.
_____ is the movement towards or away from light. Chemotaxis
Dethantaxis
Phototaxis
Answers
Phototaxis is the movement towards or away from light.
Phototaxis is the movement of an organism towards or away from a light source. Chemotaxis is the movement of an organism towards or away from a chemical substance, and dethantaxis is the movement of an organism in response to gravity.
When a whole organism moves towards or away from a stimulus of light, it engages in a type of taxis known as phototaxis. The controlled movement of a cell in response to a chemical stimulus, such as a growth factor, is known as chemotaxis. There are several cell types that use different ligands, receptors, and methods for relaying chemotactic signals.
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Which is most likely function of a cell that conducts electrical signals
Answers
Answer:
transmit nerve impulses.
Explanation:
The most likely function of a cell that conducts electrical signals is to transmit nerve impulses.
Hope this helps!
In hurn ch. 7, ____ explains that eating animals close to us, like pets, could be perceived as cannibalistic. Instead, we eat animals far from our physical and emotional realm.
Answers
Sahlin's model of edibility explains that eating animals close to us, like pets, could be perceived as cannibalistic. Instead, we eat animals far from our physical and emotional realm.
Does consuming the meat of other animals harm humans?Even the consumption of other animals may have detrimental effects on humans. In his conclusion, Korsgaard states that because we share "a certain sense of solidarity" with other sentient beings, destroying other living things is not a moral course of action. Her most vociferous defense of factory farming.
Why do animals engage in cannibalism?Thus, this is applicable to all animals, including humans, mammals, and insects. Cannibalistic animals exist for a variety of reasons, despite the fact that this may sound horrifying. Even while their motivation to consume other members of their own species is usually related to survival, this information can nonetheless be extremely shocking.
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What are some random things that you’re too anxious to ask??
Answers
Answer: Um for me I don't really have any questions that i am too anxious to ask but some people are too anxious to ask about "why do I bite my nails," or " when people have anger problems they might ask why are so mad...
Sorry if this doesn't help... Stay safe and have a great weekend!!! :D
Answer:
Some things im to anxious to ask some people is some really weird stuff. Why? Because me and the guys do dares and really dumb stuff. Sometimes it gives me the chills and sometimes, I might not even do it. But if I don't do it, I would get punished and do really weird things. Like ding dong ditch, jumping into horse poop, etc.
Explanation:
¿Qué función cumplen las vitaminas?, Nombra al menos 4 de ellas
indicando que función cumplen, cuál es su estructura química y en que
alimentos pueden encontrarse?
Answers
Answer:
i'm sorry but I don't understand
Consider the following statement and the diagrams below and answer the questions. *Permanent tissues displaced a variety of shapes and cell wall features that are related to their functions in the plant.
Answers
Option a is parenchyma, option B is collenchyma, and option C is scelerenchyme. All three of these are types of plant tissues that provide structural support and perform various functions in plants.
Parenchyma is one most the common and versatile type of plant tissue that consists of living cells with thin cell walls. Parenchyma cells are generally isodiametric, and they have large central vacuoles. The cells can store nutrients such as starch, proteins, and water, and take part in photosynthesis and gas exchange. Collenchyma cells have an elongated shape, and also providing flexible support and thickened cell wall etc. Sclerenchyma cells provide rigid support to plant organs and help with conductivity too.
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Which of the following is responsible for the earthquake
activity in California?
The interaction of tides with the coast
O Plates grinding past each other along active faults
O Mining activity during the 19 century
The lowering of aquifer levels
Answers
Explanation:
Earthquakes are the result of released energy from tectonic plates rubbing against each other on active fault lines.
As a new nucleotide is added to the growing dna strand, which part of the new nucleotide forms a bond with the 3’oh group?.
Answers
As new nucleotides are added to a strand of DNA or RNA, the 3' end of the chain grows, with the 5′ phosphate of an incoming nucleotide attaching to the hydroxyl group. This results in a chain, with each sugar connected to its neighbors via a set of bonds known as a phosphodiester linkage.
The process by which a double-stranded DNA molecule is copied to produce two identical DNA molecules is known as DNA replication. Replication is necessary because when a cell divides, the two new daughter cells must have the same genetic information, or DNA, as the parent cell.
The process by which the genome's DNA is copied in cells is known as DNA replication. Before dividing, a cell must copy (or replicate) its entire genome so that each resulting daughter cell has its own complete genome. DNA is made up of two linked strands that wind around each other to form a twisted ladder-like structure known as a double helix.
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carbon – containing energy sources formed from the decomposing a prehistoric organism or called 
Answers
Answer:
Fossil fuels
explanation: Coal is one type of fossil fuel. This is a nonrenewable energy source whose extraction often damages the environment. Fossil fuels are made from decomposing plants and animals. These fuels are found in the Earth's crust and contain carbon and hydrogen, which can be burned for energy
:)
By enabling the auto keyframe tool, any changes you make to the position, rotation, or scale of an object will be saved on the active frame.
Answers
Answer:
True
Explanation: is correct
Schleiden concluded all plants are made of cells and Schwann concluded the same thing about animals. Together, how did they contribute to cell theory?
They proved that cells are neither created nor destroyed.
They published several ideas on cell generation.
O They created the theories on the division of cells.
O They claimed that cells were the basic unit of all living organisms.
Answers
They created the theories on the division of cells.
What about cells in plant and animal?The smallest unit of life, cells serve as the foundation for all living things. Each part of a cell has a specific purpose. Both differences and similarities exist between plant and animal cells. The mitochondria, cell membrane, cytoplasm, and nucleus are all present in both plant and animal cells.The fundamental unit of life in species belonging to the kingdom Plantae is the cell. They are eukaryotic cells, which have specialized components called organelles and a real nucleus that performs several duties.Animal cells are typical eukaryotic cells since they have a membrane-bound nucleus and organelles and are encased in a plasma membrane.
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Answer:
D
Explanation:
I got it right on my quiz also if you look at what Schleiden and Schwann wrote they even said that “All living things are made up of one or more cells.” Which basically explains option D.
one example of prokaryote is a
Answers
Answer:
all single-celled organisms
Explanation:
Answer:
Prokaryotes are all single-celled organisms, most of which you know of as bacteria. For example, the famous (or infamous) Escherichia coli bacterium is a prokaryote, as is the streptococcus bacterium responsible for strep throat.
Explanation:
The biological selection of a particular allele for a trait to be passed to offspring has nothing do with the selection of the allele for another trait. Which of the following supports this statement?
Answers
Answer:
1
Explanation:
If a postsynaptic cell has receptors for acetylcholine, what do we know about the postsynaptic cell?
Answers
The postsynaptic cell is capable of receiving and responding to signals transmitted by acetylcholine.
1. Acetylcholine is a neurotransmitter: Acetylcholine is a chemical messenger that is released by the presynaptic cell and binds to receptors on the postsynaptic cell.
2. Receptors for acetylcholine are present: The fact that the postsynaptic cell has receptors for acetylcholine indicates that it is capable of receiving and responding to signals transmitted by acetylcholine.
3. It is likely to be a cholinergic cell: Cholinergic cells are cells that use acetylcholine as their primary neurotransmitter. if a postsynaptic cell has receptors for acetylcholine, it is likely to be a cholinergic cell.
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the fundamental reproductive cell produced by fungi is the _______.
Answers
an effective learning method? go of practical work in science? g. Is the scientific method of learning
Answers
Practical work in science is an effective learning method that allows students to apply theoretical knowledge, gain practical experience, and develop critical thinking and problem-solving skills.
Practical work in science is an effective learning method as it allows students to apply theoretical knowledge to real-world situations and gain practical experience in scientific methods and techniques. Through hands-on experimentation, students can develop critical thinking and problem-solving skills, as well as improve their understanding of scientific concepts. The scientific method is a key component of practical work in science, as it provides a systematic approach to conducting experiments and analyzing data. By following the steps of the scientific method, students can learn how to formulate hypotheses, design experiments, collect and analyze data, and draw conclusions based on their findings. Moreover, practical work in science can also foster creativity and curiosity, as students are encouraged to explore and investigate different scientific phenomena. This can help to inspire a passion for science and encourage students to pursue further study in science-related fields. The scientific method is a fundamental aspect of this approach, providing a systematic and structured framework for conducting experiments and analyzing data.
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