The hydrophobic, nonpolar regions of Phospholipids must align with each other in order for the structure to have minimal potential energy and, consequently, higher stability.
Because their fatty acid tails are poorly soluble in water, phospholipids spontaneously form bilayers in aqueous solutions, with the hydrophobic tails buried in the interior of the membrane and the polar head groups exposed on both sides, in contact with water.
Phospholipids in the lipid bilayer of a cell membrane orient themselves so that the heads face outward because the heads containing the phosphate group are hydrophilic and the cytoplasm of the cell is an aqueous environment.
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What is the danger of engaging in unprotected pre marital sex?
Engaging in unprotected premarital sex can be dangerous as it increases the risk of sexually transmitted infections (STIs) and unintended pregnancies, and can also have emotional and mental impacts.
Engaging in unprotected premarital sex can be dangerous because it increases the risk of sexually transmitted infections (STIs) and unintended pregnancies.
STIs, such as HIV, chlamydia, and syphilis, can be transmitted through unprotected sexual contact. Some STIs can cause serious health problems and even death if left untreated. Some STIs, like HPV or herpes, may not show any symptoms, but can still cause long-term health issues.Unintended pregnancies can also occur as a result of unprotected premarital sex. This can lead to a variety of personal, social, and economic challenges, including emotional and financial burdens, interruptions to education or career plans, and the need for parenting or adoption arrangements.Additionally, unprotected premarital sex can also have emotional and mental impacts, such as guilt, regret, or emotional distress.It's worth noting that practicing safe sex, including the use of condoms and other forms of contraception, can greatly reduce the risk of STIs and unintended pregnancies, as well as emotional and mental distress.To learn more about unprotected pre-marital sex at
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What are examples of environmental influences?
The examples of environmental influences
chemical pollutionair pollutionclimate changedisease-causing microbeslack of access to health carepoor infrastructureand poor water quality.There is speculation that environmental factors can affect behavior both directly and indirectly. The indirect causal mechanism illustrates how cognitions that are specific to a behavior play a mediating role in the influence of the environment on behavior. A direct influence shows how the environment automatically and unconsciously affects behavior.
Certain behavioral and personal characteristics are hypothesized to modify the causal pathway (i.e., inducing either the automatic or the cognitively mediated environment – behavior relation). The EnRG framework also uses an energy balance approach, which encourages an integrated investigation of factors influencing nutrition and exercise.
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Color blindness is a recessive X-linked trait in humans. In a family where the mother is color-blind and the father is normal, the probability of their having a color-blind son is
If the mother is color blind and the father is normal, the chance that their son will be color blind is ¼ or 25%.
The color-blind mother's genotype is XXc and the normal father's genotype is XY, so the offspring are:
Parents: XXc >< XY
Gametes: X , Xc >< X , Y
Generation:
XX (normal female)
XY (normal male)
XXc (carrier female)
XcY (color-blind male)
The phenotypic ratio is:
¼ (normal female)
¼ (normal male)
¼ (carrier female)
¼ (color-blind males)
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More people get injured from skateboarding than any other sport
the movement of chloroplasts remind me of....
The chloroplasts are these. Maintain a close eye out for any movement in the chloroplasts. Cytoplasmic streaming is the term for movement within a cell.
In both low-light and high-light conditions, efficient photosynthesis depends on chloroplast mobility. The aforementioned claim is true since chloroplasts are an organelle that travel throughout cells through cytoplasm. Every type of cell is filled with a thick fluid called cytoplasm, in which organelles are both suspended and free to move. The cytoplasm is the home of all organelles, including the nucleus, endoplasmic reticulum, chloroplasts, and mitochondria. We may infer that chloroplast is an organelle that moves inside the cell with the help of cytoplasm since the section of the cytoplasm that does not contain organelles is known as cytosol.
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Substance Y is not present in the urine; however, it was originally filtered through the glomerulus. How is this possible
Substance Y is not present in the urine; however, it was originally filtered through the glomerulus it was reabsorbed in the proximal tubule.
As blood flows into every nephron, it enters a cluster of tiny blood vessel, the glomerulus. The skinny partitions of the glomerulus permit smaller molecules, wastes, and fluid—often water, into the tubule. Larger molecules, together with proteins and blood cells, live withinside the blood vessel. Under ordinary conditions, excessive molecular weight proteins withinside the plasma (e.g., albumin and globulin) can't skip via the filtration membrane because of the results of the scale barrier and rate barrier of the glomerular capillary filtration membrane. Proteins are not normal constituents of the glomerular filtrate.
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Which of the following statements about a gene that shows maternal effect inheritance is true?
O Offspring will have a mutant phenotype if the father has a mutant genotype.
O Offspring will show a mutant phenotype if the mother has a mutant genotype.
O Embryonic cells transcribe the gene.
O Offspring will always show a mutant phenotype if they have a mutant genotype.
A gene that shows maternal effect inheritance is a gene that is expressed in offspring only if the mother has a mutant genotype.
The offspring will show a mutant phenotype if the mother has a mutant genotype, regardless of the father's genotype. This means that the offspring will not necessarily have a mutant phenotype if the father has a mutant genotype.
This type of gene expression is regulated by the maternal environment, which includes both the mother's genotype and the environment in which she lives. Embryonic cells transcribe the gene, and so the gene is expressed in the offspring. However, the gene's expression can be suppressed or enhanced depending on the environment in which the mother lives.
Offspring will not always show a mutant phenotype if they have a mutant genotype. This is because the gene may be expressed in the offspring only if the maternal environment is favorable for expression. If the environment is not favorable, the gene may be repressed, and the offspring will not show a mutant phenotype.
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What was the main aim of Mendel's experiment?
The main aim of Mendel's experiment was to understand the principles of inheritance of genetic traits in pea plants.
He performed a series of controlled crossbreeding experiments, where he carefully selected and crossbred pea plants that exhibited specific traits, such as seed color (yellow or green) and seed shape (round or wrinkled). He then recorded the characteristics of the resulting offspring and compared them to the characteristics of the parent plants. Through these experiments, Mendel discovered that certain traits were inherited in a predictable pattern, and that these patterns could be explained by the presence of genes that controlled the inheritance of each trait. He also discovered that these factors could be dominant or recessive, and that the combination of these factors determined the phenotype (observable characteristics) of the organism. These discoveries formed the basis of Mendel's laws of inheritance, which are considered to be the foundation of the field of genetics.
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Which of the following claims about the origin of the euglenid chloroplast is best supported by the three-membrane structure of the envelope?
A
It originated from the spontaneous assembly of organic molecules into a lipid bilayer inside a free-living prokaryote.
B
It originated from the fusion of the plasma membranes of two different free-living photosynthetic prokaryotes.
C
It originated from the incorporation of a photosynthetic prokaryote into a eukaryotic cell by a single endosymbiotic event.
D
It originated from the incorporation of a photosynthetic prokaryote into a eukaryotic cell by two endosymbiotic events.
The claims about the origin of the euglenid chloroplast are best supported by the three-membrane structure of the envelope: it originated from the spontaneous assembly of organic molecules into a lipid bilayer inside a free-living prokaryote.
Thus, the correct answer is A.
Euglenids (Excаvаtа, Discobа, Euglenozoа, Euglenidа) is а group of free-living, single-celled flаgellаtes living in the аquаtic environments. The uniting аnd unique morphologicаl feаture of euglenids is the presence of а cell covering cаlled the pellicle.
The chloroplаsts of Euglenа hаve аrisen from the progressive reduction of endosymbiotic green аlgаe. The theory is supported by the presence of а third membrаne аround the chloroplаsts of Euglenа which is not endoplаsmic reticulum (ER) in origin аnd mаy be derived from the plаsmаlemmа of the originаl symbiont. In аddition, Euglenа is the only orgаnism in which chloroplаst loss cаn be induced experimentаlly. Dinoflаgellаte chloroplаsts аre аlso surrounded by three membrаnes, аnd it is proposed thаt they too evolved from symbiotic eucаryotic аlgаe.
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What causes genetic variation in a population environmental changes?
Mutations, the changes in the sequences of genes in DNA, are one source of genetic variation in a population environmental changes.
Gene flow, or the transfer of genes between several groups of organisms, is another source. The development of new gene combinations through sexual reproduction can also result in genetic variety.
Genetic variation is the variance in DNA sequences among members of a population. Germ cells, such as sperm and eggs, as well as somatic (all other) cells, are subject to variation.
Gene variants, sometimes known as mutations, can cause genetic differences, or a normal process in which genetic information is rearranged as a cell prepares to divide can also cause genetic variations (known as genetic recombination). Different phenotypes can be introduced into an organism by genetic changes that change gene activity or protein function.
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Which of these haploid strains produce permease constitutively but do not produce β-galactosidase
a. I+ P+ O+ Z- Y-
b. I+ P+ O- Z+ Y+
c. I- P+ O+ Z-Y+
d. I- P+ O+ Z+ Y-
e. I- P+ O+ Z+ Y+
The answer is : I- P+ O+ Z-Y+
The lac operon genes, which encode vital enzymes for lactose absorption and processing, must be expressed for the bacteria to utilise lactose. E. coli should only express the lac operon when two conditions are met in order to be as effective as possible:
Glucose is not readily available, but lactose is.
The Y gene codes for lactose permease.
In the operon I- P+ O+ Z-Y+, I codes for repressor protein, therefore I- implies this lacks repressor means operon is not inhibited so it is always active.
Z codes for beta-galactosidase in this operon.
This haploid species can produce permease persistently but do not produce -galactosidase since this operon has no functioning Z gene but does have a functional Y gene.
So the answer is : I- P+ O+ Z-Y+
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How do wetlands get water?
The primary source of water for wetlands is from precipitation, such as rain.
This water of precipitation is absorbed by the soil and saturates the ground, eventually making its way into the wetland.
Other sources include groundwater, water runoff from rivers, streams, and lakes, and even direct connections to larger bodies of water. In some cases, wetlands are purposefully flooded to create a habitat.
The water level in a wetland is regulated by a variety of factors, including the size of the wetland, the amount of water that flows in, the amount of water that evaporates, and the amount of water that is absorbed by plants.
In addition, wetlands can be impacted by human activities, such as dam and reservoir construction and over-irrigation, which can lead to an increase or decrease in the water level.
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Some scientists believe that life on Earth began about 3.5 billion years ago. What do they base this belief on?
A wealth of scientific evidence supports the idea that life on Earth began about 3.5 billion years ago. This proof comes from different sources, including:
Fossil records: The oldest known fossils are approximately 3.5 billion years old, showing that there were already complex forms of life present on Earth at that time.
Molecular clocks: Scientists can use the rate of molecular evolution to estimate the age of different life forms. This method has consistently placed the origin of life on Earth at around 3.5 billion years ago.
Geochemical evidence: The chemical composition of rocks and minerals from the early Earth provide clues about the conditions that may have existed when life first emerged.
For example, the presence of certain types of organic molecules in these rocks suggests that the conditions were suitable for life to evolve.
Comparisons to other planets: Scientists have found evidence of water and other conditions that may have been necessary for life to emerge on other planets in our solar system, such as Mars.
If these conditions existed on other planets, it is likely that they also lived on Earth around 3.5 billion years ago, when life is believed to have originated.
Overall, scientific evidence suggests that life on Earth began around 3.5 billion years ago, although it is possible that it may have arisen even earlier.
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To cause cancer, proto-oncogenes require __________ allele(s) to be mutated and therefore are considered ____________________ . The mutation results in a _________ of function. Normally, tumor suppressor genes inhibit the cell cycle. How do mutated tumor suppressor genes affect the cell cycle
Proto-oncogenes are rates that regularly aid cells to grow and split to create new cells or to assist cells with remaining alive. At the point when a proto-oncogene transforms (changes) or there are an excessive number of duplicates of it.
The two duplicates of a particular cancer silencer quality pair should be transformed to prompt an adjustment of cell development and growth arrangement to occur. Consequently, cancer silencer qualities are supposed to be passive at the cell level. Transformations in cancer silencer qualities are frequently procured.
Proto-oncogenes are a gathering of qualities that make ordinary cells become carcinogenic when they are transformed (Adamson, 1987; Weinstein and Joe, 2006). Transformations in proto-oncogenes are ordinarily predominant in nature, and the changed rendition of a proto-oncogene is called an oncogene.
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If the diplold (2n) number of chromosomes for this cell is four and the haploid
(n) number is two, are the daughter cells now diplold or haplold?
Following telophase I there is a short interphase; however, there is not any DNA synthesis co
chromosomes do not duplicate. Actually they don't need to since the chromosomes are still
duplicated.
Does your model agree with this statement?,
Both daughter cells now go through a second series of divisions (melosis II) as follows:
If the diplold (2n) number of chromosomes for this cell is four and the haploid number is two, are the daughter cells now diplold or haploidas it following telophase I there is a short interphase; however, there is not any DNA synthesis.
What happens in telophase II?After telophase II, each chromosome in the haploid organism has been made up of one daughter chromosome. Meiosis has the type of cell division that will results in the halves of the number of the chromosomes in the daughter cells.
Four daughter cells with each of which has half its parent cell's chromosomes, are created during the meiosis. Meiosis I and II, the first and second division has steps of the meiotic process, each involve four stages: prophase, metaphase, anaphase, and telophase.
Therefore, If the diplold (2n) number of chromosomes for this cell is four and the haploid number is two, are the daughter cells now diplold or haploidas it following telophase I there is a short interphase; however, there is not any DNA synthesis.
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Replicated chromosomes divide twice during the meiotic process to create four haploid cells, commonly known as meiocytes (sperms and eggs).
What is Meiosis?Meiosis is the process by which diploid (2n) organisms create meiocytes, which have half the ploidy of the parents and are used for sexual reproduction.
For the zygote's genetic makeup to match that of its parents, meiocyte ploidy must be cut in half. The separation and redistribution of chromosomes are accomplished during meiosis using methods similar to those used during mitosis.
Meiosis is the only process in which homologous chromosomes join up and undergo genetic recombination. Centrioles and chromosomes are replicated in the steps before meiosis, which are similar to those of mitosis.
Therefore, Replicated chromosomes divide twice during the meiotic process to create four haploid cells, commonly known as meiocytes (sperms and eggs).
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Which of the following sets of biomes is placed in order from
most to least biologically diverse?
O Boreal forest, woodland/shrubland, tropical seasonal
forest
O Tropical rain forest, temperate seasonal forest, tundra
O Subtropical desert, temperate seasonal forest, tropical rain
forest
O Tundra, woodland/shrubland, subtropical desert
Biomes are areas with distinct climates and distinct ecosystems, characterized by certain plants and animals. The biological diversity of a biome is determined by the number and variety of organisms found there.
The following sets of biomes are placed in order from most to least biologically diverse:
Tropical Rainforest - This biome is characterized by a warm and wet climate, and is home to a wide variety of plants and animals. The dense forests and high humidity make this biome the most biologically diverse of the sets listed.
Temperate Seasonal Forest - These forests typically have four distinct seasons and are home to a wide variety of animals and plants, though not as varied as the tropical rainforest.
Woodland/Shrubland - This biome is characterized by shrubby vegetation and temperate climates. While there is a wide variety of plants and animals found in this biome, it is not as biologically diverse as the other biomes listed.
Subtropical Desert - This biome is characterized by hot, dry climates and sparse vegetation. There are a few species of plants and animals that can survive in this environment, but overall there is less biological diversity than in the other biomes.
Tundra - This biome is characterized by cold climates and low levels of vegetation. Few species of plants and animals can survive in this environment, and so it is the least biologically diverse of the sets listed.
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What was the most significant conclusion that Mendel?
The most significant conclusion that Mendel drew from his experiments is that 'Traits are inherited in discrete units one from each parent'.
The main conclusion that Mendel drew from his experiments is that traits are inherited from each parent in his individual units and are not the result of interbreeding. He called these separate substantive factors pairs.
Mendel's main conclusion, drawn from his experiments with peas, is that factors are inherited as discrete units and do not exhibit mixing.
The peas he used in his experiments were a good choice because of their distinct contrasting traits, hermaphrodite flowers, short lifespan, and less variation in results with crosses.All monohybrid and dihybrid crosses he considered phenotypic and genotypic ratios were identical.
Genes are now discovered to be pieces of DNA that reside on chromosomes, but Mendel did not know which genes (Mendelian factors) consisted. A study of chromosome behavior was carried out by Sutton and Boveri with the aid of a microscope. They later compared it to the behavior of factors and genes.
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Complete question :
What was the most significant conclusion that Mendel drew from his experiments?
A There is considerable genetic variation in garden pea
B Traits are inherited in discrete units one from each parent
C Genes are composed of DNA
D Recessive genes occur as frequently as dominant ones.
How soon after administration of intravenous epinephrine should you pause compressions and reassess the baby's heart rate 8th edition?
It is not advised to stop compressions after administering an epinephrine dose. Every two minutes, the American Heart Association advises stopping compressions to check for the resumption of circulation.
Evidence of what is most effective in reviving patients serves as the foundation for resuscitative care. Best practices for resuscitative care have been outlined in recommendations created by the American Heart Association.
Cardiopulmonary Resuscitation (CPR):
For a person whose heart has stopped, CPR is a technique that involves chest compressions and help breathing.
Although there is a minimal possibility that CPR will restart an arrested heart, it is a tried-and-true technology that saves many lives each year.
In order to ensure that the most people can be saved, the CPR recommendations are consistently reviewed and revised as new knowledge about best procedures becomes available.
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Which term best describes the component of a control system that receives information about the status of a homeostatically regulated variable and initiates an appropriate response
The integrating center best describes the component of a control system that receives information about the status of a homeostatically regulated variable and initiates an appropriate response
.The brain's homeostatically often houses the integrating centre, which sends messages to various parts of the body telling them how to react to stimuli. For instance, when you place your palm on a hot surface, such as a stove, your brain's integrating centre receives a signal from your skin cells warning you that appropriate are in danger. The hypothalamus serves as the integrating hub for the negative feedback loop that the controls body temperature.
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The integrating center best describes the component of a control system that receives information about the status of a homeostatically regulated variable and initiates an appropriate response
.The brain's homeostatically often houses the integrating centre, which sends messages to various parts of the body telling them how to react to stimuli. For instance, when you place your palm on a hot surface, such as a stove, your brain's integrating centre receives a signal from your skin cells warning you that appropriate are in danger. The hypothalamus serves as the integrating hub for the negative feedback loop that the controls body temperature.
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What are the 3 classes of mollusks and how are they different?
The three main classes of mollusks are: Gastropods, Bivalves and Cephalopods. Gastropods have a single large foot, bivalves have two calcareous shells and Cephalopods are recognized by their unique method of locomotion.
Mollusks are the organisms of the phylum Mollusca. It is recognized by the presence of calcareous shells, visceral mass, muscular foot. The Mollusca is the second largest phylum of kingdom Animalia.
Cephalopods are the largest animals amongst all invertebrates, They are recognized for their method of locomotion where they release a stream of water through the body for their movement. Cephalopods have a well developed nervous system as well as closed circulatory system.
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If all of the stratospheric ozone suddenly disappeared, ________. A) plants would flourish
B) there would be a dramatic decrease in skin cancers
C) most life on Earth would cease to exist because of the amount of UV radiation penetrating the atmosphere
D) insects would be the only organisms to survive
E) Earth's surface would warm considerably
Answer:C
Explanation:
2. Experiment: Click Play and hunt peppered moths on dark tree trunks for five years. In each
year, try to capture as many moths as you can.
When you are done, select the TABLE tab and record the percentages of each moth type.
Year
Dark moths
Light moths
o
1
2
3
4
5
The total number of moths captured yearly is five. Inwhichoneis light moths and the other three are dark moths.
Moths come in a wide range of sizes, with wingspans that range from roughly 4 mm (0.16 inch) to nearly 30 cm (about 1 foot). They are highly adaptive and can survive anywhere but in arctic regions. Moths have scale-like coverings on their wings, body, and legs that fall off when the insect is handled. Moths have sturdier bodies and duller coloring than butterflies. Moths also have recognizable thick or feathered antennae. Moths retain their wings stretched at their sides or folded tent-like over their bodies when at rest, whereas butterflies hold their wings upright.
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Put the pieces of this summary of Melville’s novel Moby-Dickin order:
Captain Ahab reveals the purpose of this voyage, which is to hunt down a white whale that injured him. Before long, the whale is sighted and the battle begins.
The conflict has been resolved and order restored — at the expense of the Pequod, its crew, and its captain.
At the beginning of the story, we meet the narrator, who introduces us to Captain Ahab and the crew of his ship, the Pequod.
As he fights to capture the whale, Ahab is killed. All of Ahab’s men are also killed and the Pequod is destroyed!
At the end of the novel, the narrator explains how he lived to tell the tale.
What order does the summary lie upon from exposition, rising action, climax, falling action, and conclusion.
The correct view of the role of biology in causing people to commit crimes is that
a. males with certain body types commit the most serious crimes.
b. Lombroso proved a century ago that biological factors are the major cause of crime.
c. biological factors may have a real but small effect in causing some people to commit crimes.
d. genetics research has succeeded in explaining most criminality.
The correct view of the role of biology in causing people to commit crimes is c) biological factors may have a real but small effect in causing some people to commit crimes.So,correct option is c.
Biological factors of crime which express that whether individuals perpetrate violations relies upon their organic nature. The natural qualities that natural speculations of wrongdoing guarantee are related with guiltiness could incorporate factors like hereditary qualities, nervous system science, or actual constitution.
Albeit numerous cutting edge organic hypotheses of crime think about the impact of logical and ecological circumstances (what crime analysts call biosocial speculations), natural speculations of wrongdoing separate themselves from humanistic speculations in their emphasis on inner elements. Natural hypotheses of wrong doing created in lined up with their humanistic partners.
Biological factors of crimes expect an individual's natural qualities foreordain criminal ways of behaving. The speculations that examine the beginning of wrong doing and the impacts on an individual's choice to carry out a wrong doing incorporate old style, organic, humanistic, interactionist and psychodynamic approaches.
Hence,correct option is c.
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Which experiment would most likely contain experimental bias?
A.
A student tests the attraction of bees to flowers by placing four different flowers in the same location and counting how many bees visit each.
B.
A chemistry class performs an experiment in which each reaction has the same amount of starting material and begins at the same temperature.
C.
A lab performs a test by giving bacterial colonies the same amount of different antibiotics and growing them under the same conditions.
D.
A company that makes pain relief medication tests the effectiveness of their own medicine compared to that of three other brands.
The experiment which would most likely contain experimental bias is a company that makes pain relief medication tests the effectiveness of their own medicine compared to that of three other brands which is therefore denoted as option D.
What is an Experiment?This is referred to as a procedure which is usually carried out in the laboratory and it is used to support or refute a hypothesis.
Experimental bias on the other hand is the tendency of a scientist or researcher to introduce bias into an experiment through unconsciously affecting the results, data etc. This is because they would want to get values which would show that their drugs are more effective and suitable for use so as to promote more sales and is the reason why some form of bias may be introduced into the findings which was why it was chosen as the correct choice.
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Why was Lucy's mutation not a problem?
Because it has no effect on the active site, the gene mutation is not an issue.
Lucy was able to produce more proteins and break down deoxyadenosine correctly after receiving stem cell therapy, which helped her fight off the additional stop protein.
The active site will not be affected by the gene mutation. This is because the non-essential amino acid or protein in the molecule is affected by the mutation. The molecule maintains its original shape and state as a result. In addition, the active site of the quaternary protein structure comprises a large number of proteins. Therefore, the mutation won't have a significant impact on the molecule's overall structure or ability to perform its function.
The complete question is:
Your scan of Lucy's ADA gene showed a mutation in the active site. Why was this mutation not a problem?
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Why is a high surface area to volume ratio important in epithelial cells in the gastrointestinal GI tract?
When a cell performs its normal functions, it must exchange substances with the world outside the cell membrane. Cells with a large surface area to volume ratio can exchange substances more efficiently.
Maximizing the surface area of this organ system is important. This is because the greater the surface area of the cell the better the digestive mechanism and the greater the absorption of simplified nutrients.
Digestibility increases with increasing surface area. An explanation for this is a mechanism that accelerates and supports the number of enzymes involved in digestion, and this is one of those enzyme individuals that work more effectively on larger surfaces.
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What is a possible effect of leakage of inner ear fluid?
Answer: Body imbalance such as affect balance and hearing.
Explanation:
How does cyanide cause cell injury?
Answer:
It prevents the cells from using oxygen. And because of this cells die.
Explanation:
What can be known about Mendel's five part hypothesis it is an answer to a scientific?
Mendel established a set of five guiding principles to explain how features are passed down in pea plants, which he called his "five-part hypothesis." The following rules are there are specific "factors" that are transferred from parent to offspring and defining traits.
For each attribute, each parent gives their offspring one component. One factor will be dominant and the other will be recessive when the factors influencing a trait are distinct.
The phenotype will show the expression of the dominant factor but not the recessive factor. A child has a 50% chance of getting a particular trait from a parent.
Mendel's five-part hypothesis has been expanded upon and refined in the century and a half since his initial experiments, but the basic principles he discovered continue to form the foundation of modern genetics. Mendel's work helped establish the concept of the gene as the unit of inheritance and the idea that different versions of a gene (alleles) can result in different traits.
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