A motor neuron is a nerve cell that controls the contraction of muscle fibers.
At a neuromuscular junction, the muscle fiber membrane folds, forming a motor end plate. The motor end plate is the specialized area of the muscle fiber membrane that receives signals from the motor neuron via the release of neurotransmitters such as acetylcholine. This signal causes the muscle fiber to contract.
A motor unit is a group of muscle fibers innervated by a single motor neuron. A neurotransmitter is a chemical substance released by neurons that transmits signals across synapses to other neurons or muscle cells. A motor end cup is not a term commonly used to describe a structure in the neuromuscular junction.
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what is cell division
Answer:
ell division is the process by which a parent cell divides into two or more daughter cells.
Explanation:
There are two main types of cell division: mitosis and meiosis. In mitosis, the parent cell divides into two genetically identical daughter cells, which are exact copies of the original cell. Mitosis is involved in the growth, development, and repair of tissues in plants and animals. In meiosis, the parent cell divides into four daughter cells, each with half the number of chromosomes as the original cell. Meiosis is involved in the production of sex cells (sperm and eggs) in animals and plants. Cell division is an essential process for the survival and reproduction of living organisms.
Answer:
Cell division is the process by which a parent cell divides into two daughter cells. Cell division usually occurs as part of a larger cell cycle in which the cell grows and replicates its chromosome before dividing.
which biogeochemical cycle can be influenced by human activity and cause eutrophication of a local water supply?
The nitrogen cycle, which is responsible for the eutrophication of a local water supply, can be influenced by human activity. The correct answer is -the nitrogen cycle.
The utilization of phosphorus fertilizers excessively or carelessly causes human interference with the phosphorus cycle. Eutrophication is the result of an increase in phosphorus pollution in water bodies as a result. Eutrophication destroys water environments by prompting anoxic circumstances.
Human exercises hugely affect the carbon cycle. Changes in land use, the burning of fossil fuels, and the use of limestone in concrete all contribute significantly to the emission of carbon into the atmosphere.
Nitrogen from fertilizers seeps into soils, frequently fostering conditions that encourage weed growth over native plant development. The nitrogen then washes into streams, causing an excess of supplements, a circumstance called eutrophication.
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Q- Which of the following biochemical cycles can be influenced by human activity and cause the eutrophication of a local water supply?
-water cycle
-nitrogen cycle
-carbon cycle
-oxygen cycle
a microbiologist would like to use a noncompetent genus of streptococcal bacteria, enterococcus faecalis, as a cloning host to express genes from streptococcus pneumoniae, which is naturally competent. is this possible?
It is possible for a microbiologist to use Enterococcus faecalis, a noncompetent genus of streptococcal bacteria, as a cloning host to express genes from Streptococcus pneumoniae, which is naturally competent.
Competence in bacteria refers to the ability of the cells to take up exogenous DNA from their environment and integrate it into their own genome. Some bacterial species are naturally competent, while others are not. Enterococcus faecalis is a noncompetent genus of streptococcal bacteria, meaning it is unable to take up exogenous DNA from its environment.
On the other hand, Streptococcus pneumoniae is naturally competent and can take up exogenous DNA from its environment, including foreign genes. The microbiologist can use this property of S. pneumoniae to transfer genes from this organism to E. faecalis by transforming S. pneumoniae with the desired genes and then using it as a donor in a conjugation experiment with E. faecalis as the recipient.
During conjugation, the plasmid containing the foreign gene can be transferred from S. pneumoniae to E. faecalis, where it can be expressed. This approach allows for the expression of genes from a naturally competent organism in a noncompetent host, making it possible for the microbiologist to use E. faecalis as a cloning host to express genes from S. pneumoniae.
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which of the following statements about major components of blood is correct? plasma makes up approximately 55 percent of whole blood and includes cells and cell fragments. plasma makes up approximately 45 percent of whole blood and includes cells and cell fragments. formed elements make up approximately 55 percent of whole blood and proteins and small solutes. formed elements make up approximately 45 percent of whole blood and includes cells and cell fragments.
The correct statement about major component of blood is A. Plasma makes up approximately 55 percent of whole blood and includes cells and cell fragments.
Blood is a unique fluid that is critical for the survival of all living organisms. Blood is a specialized tissue that performs a variety of essential functions. It is made up of three major components: plasma, formed elements, and cell fragments. Plasma is the liquid portion of blood, which makes up about 55% of the total blood volume.
Plasma is a complex mixture of water, salts, gases, enzymes, and other substances. It transports nutrients, hormones, and waste products to and from various parts of the body. Formed elements and cell fragments make up the remaining 45% of the blood volume. Formed elements include red blood cells, white blood cells, and platelets. Therefore, Option A is correct
The question was incomplete. find the full content below:
which of the following statements about major components of blood is correct?
A. plasma makes up approximately 55 percent of whole blood and includes cells and cell fragments
B. plasma makes up approximately 45 percent of whole blood and includes cells and cell fragments
C. formed elements make up approximately 55 percent of whole blood and proteins and small solutes
D. formed elements make up approximately 45 percent of whole blood and includes cells and cell fragments.
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find the true statement about biofilms group of answer choices they can consist of many representatives of multiple bacterial species they are found only in outdoor environments they simplify the treatment of some infections they are found only on artificial medical implants
The true statement about biofilms is that they can consist of many representatives of multiple bacterial species.
Biofilms are complex, structured communities of microorganisms that adhere to surfaces and produce an extracellular matrix. These communities can include various species of bacteria, as well as fungi, algae, and other microorganisms.
They can be found in both natural and artificial environments, such as in rivers, oceans, soil, and on medical devices.
In a biofilm, the diverse microorganisms often cooperate and interact with each other, which can lead to enhanced survival and growth for the entire community. The extracellular matrix they produce serves as a protective barrier, making them more resistant to environmental stress and antimicrobial agents.
The presence of biofilms can complicate the treatment of infections, as they are often more resistant to antibiotics and other treatments than their free-living, planktonic counterparts. This resistance is due to several factors, including the protective matrix, decreased growth rates, and altered metabolic states within the biofilm.
Biofilms can also form on various surfaces, including both natural and artificial ones. In medical settings, they can be particularly problematic when they form on implanted devices such as catheters, prosthetic joints, and pacemakers. This can lead to chronic infections and complications, often requiring the removal and replacement of the affected device.
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what does the biological species concept use as the primary criterion for determining species boundaries? ecological niches niche differences reproductive isolation morphological similarity geographic isolation
The biological species concept use as the primary criterion for determining species boundaries is reproductive isolation.
The biological species concept is a widely used concept in biology to define a species. According to this concept, a species is defined as a group of individuals that can interbreed with each other and produce viable offspring under natural conditions.
The biological species concept holds that species represent distinct evolutionary lines and that reproductive isolation is a key factor in maintaining these lines.
Reproductive isolation can result from a variety of mechanisms, including geographic isolation, ecological specialization, and behavioral differences. The differences can become large enough that interbreeding between populations is no longer feasible.
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You have a sibling who looks NOTHING like you, even though you both have the same biological parents.
Explain, using your own words and chromosome notation (ex: 1A1C 282D 3A3D) how you and your sibling are different looking.
The reason why my sibling looks nothing like me, even though we have the same biological parents, is likely due to genetic variation and inheritance.
What accounts for the difference in phenotype?Each individual inherits half of their genetic material from their mother and the other half from their father.
This genetic material is organized into chromosomes, which are made up of DNA.
It's possible that my sibling and I inherited different combinations of alleles for certain genes, which can lead to different physical characteristics or traits.
To represent our chromosomes, we could use notation such as 1A1C 282D 3A3D, which indicates that we have 3 pairs of chromosomes (1, 2, and 3), with each chromosome having a different combination of alleles (A or C for chromosome 1, D for chromosome 2, and a combination of A and D for chromosome 3).
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plasma angiotensin ii levels would be higher when mean arterial blood pressure is blank .multiple choice question.
Plasma concentrations of angiotensin II will be higher when mean arterial pressure is low.
Angiotensin II is a hormone involved in the regulation of blood pressure. It is made from angiotensin I by the action of an enzyme called ACE (angiotensin converting enzyme). The renin-angiotensin-aldosterone system (RAAS) activated, leading to increased production of angiotensin.
Angiotensin II has several effects in the body, including vasoconstriction (narrowing of blood vessels), which increases blood pressure. It also stimulates the release of aldosterone, which promotes sodium retention resulting in increased blood volume and blood pressure.
Therefore, when mean arterial blood pressure is low, plasma angiotensin II concentrations will be higher in an attempt to increase blood pressure and restore hemodynamics to normal.
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Complete question
plasma angiotensin ii levels would be higher when mean arterial blood pressure is ________.
a. low
b. high
c. constant
What is the name for different forms of a gene?
Earlobes can be either attached or detached. The allele for attached earlobes is recessive (e), and the allele for detached earlobes is dominant (E). What must be true if a boy is born with detached earlobes?
Alleles are different variations of a Gene.
What names do the various gene types go by?A gene's variations are referred to as alleles, which are pronounced "AL-eels." Your chromosomes contain two versions of a gene that affect how your cells function. A gene pair's two alleles are passed, one from each parent.
Why are distinct variations of the same DNA referred to as alleles?More precisely, each gene is present in two copies, one from each parent, at a specific locus (location on a chromosome). However, the duplicates are not always the same. Gene copies that vary from one another are referred to as alleles.
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jill is rh negative. her first baby was rh negative. she is pregnant again, but the baby is rh positive. without medical treatment, will jill make antibodies that may attack the baby's blood?
Yes, if Jill's blood comes in contact with the Rh-positive blood of her developing baby during pregnancy or childbirth, her body may produce antibodies against the Rh factor, a protein found on the surface of red blood cells.
This can occur because Jill is Rh-negative and her baby is Rh-positive, which means that the baby's blood cells may enter Jill's bloodstream during delivery or if there is any bleeding during the pregnancy.
The production of Rh antibodies by Jill's immune system can lead to a condition known as Rh incompatibility or Rh disease. These antibodies can cross the placenta and attack the baby's red blood cells, leading to hemolytic anemia (destruction of red blood cells) and potentially causing serious complications such as jaundice, brain damage, and even death.
To prevent this, Jill can receive a medication called Rh immunoglobulin (RhIg) during her pregnancy and after delivery. RhIg works by preventing Jill's immune system from recognizing the Rh factor on her baby's red blood cells and producing antibodies against them. This treatment is highly effective in preventing Rh disease and is a routine part of prenatal care for Rh-negative women who are carrying an Rh-positive baby.
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What happens if oysters can't find the materials they need to build their shells?
Answer: Oysters are mollusks that build their shells using materials such as calcium carbonate, magnesium carbonate, and silicon dioxide that they extract from the water where they live. If oysters can’t find the materials they need to build their shells, they may have difficulty forming and maintaining their shells. This can leave them vulnerable to predators and environmental stressors. Changes in water chemistry, such as ocean acidification, can make it more difficult for oysters and other shell-building organisms to extract the materials they need to build their shells.
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assume that a single crossover occurs between two genes during meiosis. what would be the consequence of this crossover event? all of the chromatids will be nonrecombinant. three chromatids will be non recombinant, and one will be recombinant. all of the chromatids will be recombinant. three chromatids will be recombinant, and one will be nonrecombinant. two of the four chromatids will be recombinant, and two will be nonrecombinant.
The result of a single crossover between two genes during meiosis would be option D: three chromatids will be recombinant, and one will be nonrecombinant.
A single crossing event between homologous non-sister chromatids results in an exchange of DNA between chromosomes when it happens between two genes during meiosis. The synaptonemal complex disintegrates after crossover, and the Cohesin link between homologous pairs is also lost.
Genetic diversity can result from this exchange of genetic material between homologous chromosomes because it can create new allele combinations that neither of the parents possessed. Consequently, three of the chromatids will be recombinant, and one will not.
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Correct question is:
Assume that a single crossover occurs between two genes during meiosis. what would be the consequence of this crossover event?
all of the chromatids will be nonrecombinant.
three chromatids will be non-recombinant, and one will be recombinant.
all of the chromatids will be recombinant.
three chromatids will be recombinant, and one will be nonrecombinant.
two of the four chromatids will be recombinant, and two will be nonrecombinant.
when the parasympathetic activity to the heart increases? question 10 options: postganglionic neurons release acetylcholine, which binds to nicotinic cholinergic receptors in the sa node. the rate of spontaneous depolarization in sa nodal cells is not affected. sa nodal cells are depolarized. the rate of spontaneous depolarization in sa nodal cells decreases. the rate of spontaneous depolarization in sa nodal cells increases..
When the parasympathetic activity to the heart increases, option A: postganglionic neurons release acetylcholine, which binds to nicotinic cholinergic receptors in the SA node.
Acetylcholine, which binds to nicotinic cholinergic receptors in the SA node, is released by postganglionic neurons in response to an increase in parasympathetic activity to the heart. The SA nodal cells become hyperpolarized as a result of an increase in potassium conductance and a decrease in calcium conductance. As a result, SA nodal cells' rate of spontaneous depolarization declines.
A component of the involuntary nervous system, the parasympathetic nervous system slows the heart rate, stimulates the glands and intestines, and relaxes the sphincter muscles. The autonomic nervous system is made up of the sympathetic nervous system and the parasympathetic nervous system.
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Correct question:
when the parasympathetic activity to the heart increases? options:
postganglionic neurons release acetylcholine, which binds to nicotinic cholinergic receptors in the SA node.
the rate of spontaneous depolarization in SA nodal cells is not affected.
SA nodal cells are depolarized. the rate of spontaneous depolarization in SA nodal cells decreases.
the rate of spontaneous depolarization in sa nodal cells increases..
what are types of large-scale mutations on chromosomes? select all that apply. responses duplication duplication point point translocation translocation inversion
Large scale mutation can be defined as a mutation in a chromosomal level. The main types of large scale mutations will be Duplication, inversion, and deletion.
There are two types of mutations. Large scale and small scale mutations. Small scale mutation is when changes occurs to only a small number of nucleotides. Large scale mutation happens on a large scale, affecting a large number of nucleotides in the sequence.
Large scale mutation can happen as
1) Duplication - Also known as amplification, where there are multiple copies of a chromosomal region is formed.
2) Inversion - These are rearrangement within the chromosomes, which can be pericentric and paracentric.
3) Deletion - It can happen either when a large part of chromosome is deleted or an allele is deleted. Example : Down's syndrome.
So the large scale mutations are Duplication, inversion, deletion.
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The complete question is given below
What are types of large-scale mutations on chromosomes? select all that apply.
Duplication, Point-point translocation, Inversion, Deletion, Insertions
COLLABORATE: Write your answers to the following questions about the image in Figure 2. Compare yours answers with a partner, and write down any new information that you had not previously recorded.
1. What patterns do you observe?
2. How many chromosomes do human body cells have?
3. What differences do you see among the different pairs of chromosomes and the chromosomes within a pair?
Explanation:
The patterns observed in the image are the distinct shapes and sizes of the chromosomes, the pairing of chromosomes, and the arrangement of the chromosomes in a specific order.
Human body cells have 46 chromosomes, which are arranged in 23 pairs.
The differences observed among the different pairs of chromosomes and the chromosomes within a pair are their size, shape, and banding pattern. The chromosomes are paired based on their size, shape, and banding pattern, with one chromosome coming from the mother and the other from the father. The sex chromosomes (X and Y) are the only pair that differ significantly in size and shape. The autosomes, or non-sex chromosomes, are arranged in pairs of similar size and shape.
How are Photosynthesis and Cellular respiration” complementary” (related)?
Cellular respiration and photosynthesis are complementary metabolic processes.
Photosynthesis is the process through which plants convert carbon dioxide, water, and sunshine into oxygen and sugar-based energy.
Cellular respiration is the process by which living things mix oxygen with food molecules, directing the chemical energy contained in these molecules toward life-sustaining processes while expelling waste materials, carbon dioxide, and water.
Photosynthesis and cellular respiration are related:
Glucose produced by photosynthesis is converted into ATP during cellular respiration.The carbon dioxide utilized in photosynthesis is subsequently created from the glucose.Cells can release and store energy with its aid.It keeps the ratio of oxygen and carbon dioxide in the atmosphere stable.To learn more about cellular respiration,
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what is another reason for cleaning wastewater, besides disposing of dangerous pathogens and chemicals that threaten humans and wildlife?
Another reason for cleaning wastewater is to conserve water resources.
Water is a finite resource, and as the world's population grows, demands for clean water are increasing. Wastewater contains a significant amount of water that can be treated and reused, thereby reducing the need for fresh water resources. This is particularly important in areas where water is scarce or where droughts are frequent.
Moreover, treating wastewater and reusing it can also reduce the amount of wastewater that is discharged into rivers, lakes, and oceans, which can have negative impacts on aquatic ecosystems. When wastewater is not properly treated, it can contribute to eutrophication, which is the process of excessive nutrient enrichment that leads to the growth of harmful algae and the depletion of oxygen in water bodies.
Therefore, by cleaning wastewater, not only can we protect public health and the environment, but we can also conserve water resources and ensure the sustainable use of this precious resource.
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which event indicates that evolution has occurred? responses the population of moose in an area experiences a drastic decline. the population of moose in an area experiences a drastic decline. the frequency of the brown coat allele in a wolf population decreases. the frequency of the brown coat allele in a wolf population decreases. beavers gain significant weight in preparation to survive winter. beavers gain significant weight in preparation to survive winter. the leaves on many trees change color and fall off in autumn.
The frequency of the brown coat allele in a wolf population decreases." event indicates that evolution has occurred So the correct C.
Evolution is defined as a change in the genetic composition of a population over time. When the frequency of a particular allele (variation of a gene) changes in a population over generations, it indicates that evolutionary change has occurred. In the given scenario, the decrease in the frequency of a brown coat allele in a wolf population indicates that some factor, such as environmental pressure or random mutation, is leading to certain traits becoming more or less common in the population over time.
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Full Question ;
Which event indicates that evolution has occurred?
O Beavers gain significant weight in preparation to survive winter.
O The population of moose in an area experiences a drastic decline.
The frequency of the brown coat allele in a wolf population decreases.
O The leaves on many trees change color and fall off in autumn.
why is the percentage similarity in the gene always lower than the percentage similarity in the protein for each of the species? (hint: recall how a gene is expressed to produce a protein.) draw a cladogram depicting the evolutionary relationships among all five species (including humans) according to their percent similarity in the gapdh gene.
The percentage of homology in a gene is always lower because a gene undergoes many different modifications, such as alternative splicing, RNA editing, and post-translational modifications.
Code, which can lead to different protein isoforms to varying degrees. of similarity. In addition, different genes may encode proteins with similar functions or structures, so the proportion of homology in proteins may be higher due to convergent evolution.
_________________________
| ____________|____
_____|_____ | |
| | | |___ Human
____|____ | |
| |______|___ Chimpanzees
| |
__|__ |___ Gorilla
| |
Orang Gibbon
In this clone, percentage similarity in the GAPDH gene was used to determine evolutionary relationships between species. The species with the highest similarity rates are closest relatives, while those with the lowest similarity rates are more distantly related.
Based on this branching graph, humans and chimpanzees have the highest similarity rates for the GAPDH gene, followed by gorillas, orangutans, and apes. This suggests that humans, chimpanzees and gorillas are more closely related than orangutans and apes.
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expression of a particular gene during development causes bone growth to stop sooner in vertebrae than in ribs in salamanders. this gene is acting as a , and its effects are an example of
Expression of a particular gene during development causes bone growth to stop sooner in vertebrae than in ribs in salamanders. This gene is acting as a repressor, and its effects are an example of differential gene expression.
Differential gene expression refers to the phenomenon whereby genes are expressed differently in different cell types, developmental stages, or environmental conditions. This allows for the specialization of cell types and the adaptation of organisms to different environments.
In the case of salamanders, the expression of a particular gene acts as a repressor, preventing bone growth in vertebrae before it occurs in ribs. This differential expression of the gene results in distinct bone structures in different parts of the body.
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a mutation causing an addition or a deletion of one base pair resulted in the production of a nonfunctional mutant protein. the sequences of the normal and mutant proteins are given below. normal: met - gly - glu - val - asp mutant: met - gly - lys - ser - ile - lys - trp - arg - ..... was this mutation cause by an insertion or a deletion? answer
The sequences of the normal and mutant proteins are mutations can be caused by the insertion of one or more base pairs.
Mutations that lead to the production of non-functional proteins can be caused by several types of DNA changes, including point mutations (changes to a single base), addition, and deletion.
In this case, the mutant protein has more amino acids than the normal protein, indicating that one or more base pairs have been inserted into the DNA strand. If deletion occurs, one or more amino acids will be missing in the mutant protein compared with the normal protein.
However, in the mutant protein sequence mentioned above, there are additional amino acids (lysine, serine, isoleucine, lysine, tryptophan, arginine) that are not present in the normal protein sequence.
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A scientist is designing an investigation to find out whether the amount of light that a plant receives is related to how much food the plant has to help it grow. For her experiment, the scientist plans to give one plant only one hour of light per day, another plant five hours of light per day and a third plant 10 hours of light per day. Then she will use a ruler to measure how much each plant grows each day. The set-up for her experiment is shown below. Which of the following will help make sure that the investigation is a fair test?
Apply the equal quantity of fertiliser to each plant.In order to determine the impact of a variable—in this experiment, light—all other conditions must be set.
Experimental and observational techniques are employed in science to determine how sunlight affects plant development. Consider using seeds that were sown in two distinct pots for this strategy. It is necessary to set a container of seeds in an area with ample sunshine. Wrap some of a leaf with light-resistant paper or foil. In order to determine the impact of a variable—in this experiment, light—all other conditions must be set.Draw a picture of the leaf. For many hours, place the plant under strong light. Do the 4-step starch test to check the leaf for starch. This starch becomes blue-black when it comes into contact with the iodine solution.
(A scientist is designing an investigation to find out what is the amount of light that a plant receives is related to how much food the plant has to help it grow. For her experiment, the scientist plans to get one plant only one hour of light per day another plant five hours of light per day and a third plant 10 hours of light per day. Then she will use a roller to measure how much each plant grows each day. The set up for her experiment is shown below. Which of the following will help make sure that the investigation is a fear test?
a. Use the three different types of lightbulbs.
b. Give the plants with less light more fertilizer.
c. Give each plant the same amount of fertilizer.
d. Use three different types of plants.
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Which person will get more UV light, people with high pigmentation rather than low pigmentation on a cell?
Answer:
People with low pigmentation will get more UV light than those with high pigmentation. This is because melanin, the pigment responsible for skin color, acts as a natural sunscreen and absorbs UV radiation. Therefore, people with more melanin have a natural protection against UV radiation, whereas those with less melanin are more susceptible to the harmful effects of UV radiation. However, it is still important for people with high pigmentation to protect their skin from the sun by wearing sunscreen and protective clothing.
Jack and Jill poured hot chocolate from the same container into different thermoses. At lunch time, the temperature of Jack's hot chocolate was 80° F. The temperature of Jill's hot chocolate was 85° F. Whose thermos has better insulation?
Answer:Jill’s
Explanation: Jill’s is warmer which makes her have the better insulation
Using the family in the pedigree as an example explain how the trait of hemophilia is expressed and how it passes through generations
Hemophilia is a genetic disorder that affects blood clotting. It is caused by mutations in genes that control blood clotting factors. One example of how hemophilia is expressed and passed through generations can be seen in a pedigree.
In the family pedigree example, hemophilia is expressed and passed through generations as follows:
1. Hemophilia is an X-linked recessive trait, meaning it is carried on the X chromosome and requires only one copy of the mutated gene to express the trait in males (XY). Females (XX) require two copies of the mutated gene to express the trait, making it rarer in females.
2. If the mother is a carrier of the hemophilia gene (XhX), she has a 50% chance of passing the mutated gene (Xh) to each child, regardless of their sex. If the father is unaffected (X), he will only pass the normal X chromosome (X) to his daughters and the Y chromosome (Y) to his sons.
3. If a son inherits the mutated gene (Xh) from his mother and the Y chromosome from his father (XhY), he will express the hemophilia trait.
4. If a daughter inherits the mutated gene (Xh) from her mother and the normal X chromosome from her father (XhX), she will be a carrier of the hemophilia trait but will not express it.
5. If a daughter inherits two copies of the mutated gene (XhXh), she will express the hemophilia trait, which is very rare.
6. In the family pedigree, hemophilia is passed down through generations as carriers or affected individuals continue to reproduce. By analyzing the pedigree, we can determine the probability of future generations inheriting the hemophilia trait or being carriers.
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imagine you are able to watch dna replication under a microscope in a mutant strain of bacteria. the parental strands appear to unwind and separate, but then they immediately join back together before any new dna can be synthesized. what protein is missing or defective in this bacterial strain?
If the parental strands of DNA appear to unwind and separate, but then immediately join back together before any new DNA can be synthesized, it is likely that the bacterial strain is missing or has a defective helicase protein.
The protein that is likely missing or defective in this bacterial strain is DNA helicase. Helicase is responsible for unwinding the double-stranded DNA into single strands so that they can serve as templates for the synthesis of new DNA strands.
Without functional helicase, the DNA replication process would be disrupted, and the parental strands would not be able to separate properly to synthesize new strands.
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fossils and genes are used to determine a how many mutations occurred in a species over time. b how species will change over time. c differences between organisms d how species interact with each other.
Genes and fossils are used to ascertain differences between organisms. So, the correct option is c.
Genes and fossils are both significant sources of knowledge for research into the variety and development of life on Earth. While genes reveal details about the genetic connections between living things, fossils show the physical traits of extinct animals.
Scientists can learn more about how creatures have evolved over time and how they are connected to one another by comparing fossils and genomes. Researchers can recreate the evolutionary history of animals and deduce the patterns of diversification and adaptation that have taken place by comparing and contrasting ancient morphology and DNA sequences.
However, the number of mutations that happened in a species through time, how that species will change over time, or how species interact with one another are not typically determined using fossils or genes. Several forms of data and analytical techniques, such as population genetics, ecological modelling, and experimental research, are needed to answer these concerns.
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Cell 4 and Cell 7 will not be able to synthesize a major biological molecule. What molecule is
this?
The endoplasmic reticulum (ER) and smooth endoplasmic reticulum (SER) are important organelles in eukaryotic cells that play a vital role in the synthesis, modification, and transport of a variety of biomolecules, including lipids, steroids, and proteins.
If the ER and SER are removed from a human cell, the cell would not be able to synthesize phospholipids, a major component of cell membranes.
Phospholipids are amphipathic molecules consisting of a hydrophilic head and a hydrophobic tail. They are essential building blocks of cell membranes and play a crucial role in maintaining the integrity of the membrane, regulating cellular transport, and signaling.
The ER and SER are involved in the synthesis of phospholipids by providing the necessary enzymes and cofactors required for the biosynthesis of these molecules. Without the ER and SER, the cell would not be able to synthesize phospholipids, leading to a loss of membrane integrity and potentially causing the cell to lyse.
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An alligator that is just born knows to hide itself in the ground for a few weeks until it is big enough to protect itself. It was born with the ability to do this. This is an example of
an acquired trait
natural selection
an adaptation
Answer: An acquired trait
Explanation: "It was born with the ability to do this" - The alligator inherited the trait from the parent.
mitochondria are regraded as semi-autonomous cell organelles. support that mitochondria in many of the eukaryotic cell have evolved from prokaryotic cell
Answer:
The mitochondria are semi-autonomous cell organelles which are evolved from prokaryotic cells.
Explanation:
The mitochondria is surrounded by lipid bilayer membrane.They possess their own self replicating DNA ,also 70s ribosomes for protine synthesis,so they are believed to have evolved from prokaryotic cells