Answer:
B. Clams and squid have been evolving separately for a shorter time than clams and snails.
Explanation:
A molecular clock is a genetic tool often used in Evolutionary Biology which states that the genetic material and proteins evolve over time at a relatively constant rate. Therefore, the differences in their genome depend on the common ancestor both species share.
In this case, clams and squid are more closely related than clams and snails. Therefore, they have been evolving separately for a shorter time than clams and snails.
The process of _____________ is modeled in the plant cell diagrams seen here.
Answer:
The process of "Osmosis" is modeled in the plant cell diagrams seen here.
Explanation:
Osmosis is the natural gross migration of solvent particles into a zone of higher solute concentration via a selectively permeable membrane, in the path that seeks to balance the amounts of solvents on both the ends. Osmosis as biological membranes are semipermeable, is a critical mechanism in biological systems.
Such membranes are usually impenetrable to massive and polar molecules like polysaccharides, ions and proteins while being porous to hydrophobic or non-polar molecules like lipids and to small molecules as carbon dioxide, oxygen, nitric oxides and nitrogen.
Why isn’t blended inheritance a good explanation of heredity
The problem with blended inheritance is that it cannot account for certain observations.
What is heredity?Heredity, also known as inheritance or biological inheritance, is the passing on of traits from parents to their offspring; the offspring cells or organisms acquire the genetic information of their parents through asexual or sexual reproduction.
One of the most serious problems with the blending inheritance hypothesis is that offspring are frequently intermediate in some traits between their parents.
This can result in populations becoming highly uniform over generations, with no new variation emerging.
The issue with blended inheritance is that it cannot explain certain observations, such as traits that sometimes skip a generation or how two people of medium height could have a child who grew up to be much taller than them.
Thus, the blended inheritance is not a good explanation of heredity.
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Why do scientists arrange the organisms on the tree below with some organisms closer than others?
Answer:
A phylogenetic tree can be described as a diagram which is used to depict the evolutionary histories among organisms and to relate which organisms might have a more common ancestor in the past.
Scientists arrange the organisms on the tree with some organisms closer to one another because these organisms have a more common ancestor in the near past as compared to the other organisms mentioned in the phylogenetic tree.
Answer:
Explanation:
well.... wheres the answer
QUICK
Which of these countries is currently led by a dictator?
A.
North Korea
B.
India
C.
Russia
D.
Italy
why do many animals in temperature countries grow thick coats before winter?
Answer: To help retain warmth throughout the winter, they also grow thicker, shaggier coats, which they shed in the spring when the weather becomes warm again.
Explanation: They want to stay warm.
Hope this helped
:D
Which of the following must be met for a scientifically valid sample? Subjects are selected:
Check ALL that apply
A. To represent the population
B. Based only on who volunteers
C. From the most conveniently available people
D. At random
Answer:
The correct answer is: A. and D.
Explanation:
In order to scientifically validate a sample, it is necessary that,The entire population under study should be considered to obtain an average or a mean data. If only a part of the population is considered then the result obtained would be a biased one. A biased data will not represent the entire population and so it would be incorrect.The sample choice done must be at random covering all the areas of the population to get the accurate result. This is because random selection lowers the possibility of getting biased.
A scientifically valid sample must be representative of the population, not based on who volunteers or conveniently available people, and should be selected at random. The correct option is A and D.
Explanation:To ensure a scientifically valid sample, subjects should be selected to represent the population, meaning they are a true reflection of the entire population. Selecting subjects based only on who volunteers or from the most conveniently available people may introduce bias into the sample. The best practice for selecting a scientifically valid sample is to choose subjects at random, which means every member of the population has an equal chance of being selected.
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Complete the sentence: Ecosystem distribution
is related to altitude; regions at high elevations
are cold and therefore
Answer:
Hypotheses may vary. Most students will probably state that ecosystems at
high altitudes will support little vegetation.
Explanation:
Ecosystem distribution is different at different places. Regions at high elevations might usually have low varieties of plants and animals but it cannot be true for every ecosystem located as higher altitudes.
Some communities might be well adapted to live in the cold and hence progress rapidly.
Ecosystem distribution varies with altitude. High-altitude regions are cold and therefore have species adapted to such conditions, like pine trees and snow leopards. In contrast, low-altitude regions offer a more temperate climate, thus hosting a wider diversity of species.
Explanation:Ecosystem distribution is related to altitude. Regions at high elevations are cold and therefore, host different types of flora and fauna than those at low elevations. Whether it's the extreme conditions of a mountaintop or the lush, verdant growth at sea level, the ecosystem distribution varies significantly with altitude.
Plants that can survive freezing temperatures, snow, and high winds, such as pine trees and snow leopards, thrive in high-altitude areas. Similarly, animal adapt differently to high altitudes. For instance, snow leopards have thick fur and long tails for insulation against the cold, and yaks have large lungs to accommodate the thin air. In contrast, the low-altitude ecosystems feature a broader diversity of species, as they offer a more temperate climate.
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What are the two main sources of energy in the water cycle?
Question 1 options:
gravitational energy and thermal energy
gravitational energy and mechanical energy
hydro energy and gravitational energy
kinetic energy and thermal energy
Answer:
hydro energy and gravitational energy
Explanation:
What three parts of the scientific name of a plant do you need to know and understand as an agriscientist? Why?
Answer:
Scientific name of a plant is represented by the : Name of the Genus, Name of the Species and Name of the sub-species.
Explanation:
Classification of living organisms is done in order to distinguish and separate the contrasting organisms and to club the related organisms near each other. This is done to ease out the study of the diverse living organisms.Genus - It is the hierarchical taxonomic classification of living organisms which is positioned below the Family but above the Species.Species - It is the hierarchical taxonomic classification of living organisms which is positioned below the Genus and above the Sub-species. The individuals belonging to a particular species can interbreed among themselves.Sub-species - It can be defined as the different populations of the same species which may occupy isolated and unrelated habitats and may vary in different characters.Taking the example of pea plant,Name of the Genus - Pisum.Name of the species - sativum.Name of sub-species - sativum (garden pea), elatius (wild pea).Why does ethanol becomes cloudy/white when testing fat
Answer:
Ethanol is known as a fat solvent, and the cloudy or white color that it acquires when testing fat is due to the fact that this test includes the addition of water, forming an emulsion.
Explanation:
The emulsion test for fats is a test used to show the presence of these in some substances or foods.
Under normal conditions, fats are miscible - they can be dissolved - in ethanol, an alcohol, but not in water.
This test consists of dissolving the substance to be tested in ethanol, and then adding water. The principle by which the emulsion test is governed is that ethanol allows a certain amount of fat to dissolve in water, forming a cloudy or whitish emulsion.
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Final answer:
Ethanol causes fats to form tiny droplets and become insoluble, resulting in a cloudy appearance due to the formation of an emulsion, which demonstrates the principle that like dissolves like.
Explanation:
The cloudiness or white appearance that occurs when ethanol is used in testing for fats is due to a physical process called emulsification. When ethanol is added to a solution that contains fats, such as in a food testing scenario, the fats can precipitate or separate from the solution because ethanol is less polar than water. Fats are nonpolar molecules, and when a polar solvent like water is mixed with a less polar solvent like ethanol, the nonpolar fats become insoluble and form tiny droplets, leading to a cloudy appearance. This is a demonstration of the principle that like dissolves like: polar solvents dissolve polar substances, and nonpolar solvents dissolve nonpolar substances. When nonpolar fats come into contact with ethanol, which does not dissolve them as well as water, they form an emulsion, which is a mixture of tiny droplets dispersed throughout the solvent.
This effect can also be observed in other scenarios. For example, when bile salts aid in the digestion of fats by breaking them down into smaller droplets, this increases the surface area for the enzyme lipase to work efficiently, which is essential for proper fat digestion inside the body.
When does the Mitosis-promoting factor (MPF) Cyclin concentration decline during a typical cell cycle in clam
eggs?
Answer:
During the division of cell nucleus, Mitosis-promoting factor (MPF) Cyclin concentration decline during a typical cell cycle in clam eggs
Explanation:
It is the absorption of cyclin that grounds the fluctuations in MPF absorption during the cell cycle. Synthesis of cyclin happens throughout interphase, instigating a build-up of cyclin. As additional cyclin is accessible to associate with Cdk1, the absorption of active MPF rises. MPF is made up of two proteins, a protein kinase (cdc2 in yeast) whose levels are constant throughout the cell cycle and a cyclin (cdc 13 in yeast) whose levels fluctuate during the cell cycle.
What is skin cancer and how does it occur?
Answer:
Skin cancer refers to the abnormal activity of skin cells associated with carcinogenesis
Explanation:
This disease is associated with the DNA damage (mutations) often caused by the irrational exposition to UV sun rays that trigger DNA mutations capable of both inactivating tumor suppresor genes and activating oncogenes
Answer:
Skin cancer is the uncontrolled growth of skin cells.
Explanation:
They grow and divide without stopping, and they can spread to other places in your body.
Skin cancer is frequently caused by exposure to ultraviolet rays from the sun or from tanning beds.
The UV light can cause mutations in your skin’s DNA so it can’t control skin cell growth. The result is often skin cancer.
the production of haploid(N) gametes is the main purpose of __________.
Answer: Meiosis
Explanation: There two types of cell division: Meiosis and mitosis. Meiosis occurs in sex cells otherwise called gametes. In meiosis, a single cell divides two times to produce four daughter cells with haploid number of chromosomes i.e., half the number of chromosomes in the parent cell.
How does a mechanical wave travel through a medium
Answer:
Mechanical waves tend to travel in matter through oscillations or vibrations of matter. Hence, mechanical waves need a medium to be transferred.
Energy is given to the matter in the from of an input in which mechanical waves are to be observed. As an output, the mechanical waves travel through the medium until all the energy in the waves is transferred to oscillations.
Example of mechanical waves includes the sound waves.
Which type of mutation is responsible for small changes in a trait
Substituion mutation is responsible for small changes in a trait.
Explanation:
This kind of mutation merely changes the type of nucleotide in the DNA sequence. The mutation does not cause a frameshift as would a deletion of addition mutation.
A substitution mutation would at worst change an amino acid in the translated protein. This would likely have a slight effect on how the protein folds into an active protein. On the other hand, mutations that cause frameshifts have the biggest effect on the proteins. They change all the amino acids of a protein downstream of the point of mutation.
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6. Risk assessment depends on
A medicine
B climate
C scientific research
D political stability
Answer: A
Explanation:
Cleavage is chick is called discoidal type,why?
Answer; Explanation:
In chicks, the pattern of cleavage is oftentimes referred to as the discoidal because it is entirely associated with the circular disc found in the blastodisc- the cytoplasm. So when during cleavage process, the cells that arise are known as blastomeres which then collectively form the blastoderm.
what is the phenotypic ratio that results from a dihybrid cross between two organisms and that are heterozygous for both traits
Answer:
The phenotype ratio predicted for dihybrid cross is 9:3:3:1.
Explanation:
A dihybrid cross tracks two traits. Both parents are heterozygous, and one allele for each trait exhibits complete dominance *. This means that both parents have recessive alleles, but exhibit the dominant phenotype. (Sorry if i Misspelled some words)
Final answer:
The phenotypic ratio from a dihybrid cross between two heterozygous organisms is typically 9:3:3:1, calculated using a Punnett square. This ratio applies when traits are independently assorted and show complete dominance. Deviations can occur with different interactions such as epistasis.
Explanation:
The phenotypic ratio that results from a dihybrid cross between two organisms that are heterozygous for both traits is typically 9:3:3:1. This ratio emerges from crossing individuals with the genotype AaBb x AaBb, where 'A' and 'a' represent the alleles of one gene, and 'B' and 'b' represent the alleles of a second gene. Both traits are independently assorted and show complete dominance.
To calculate the ratio, you would use a Punnett square to predict the genotype of their offspring. The resulting phenotypic ratio is:
9 showing both dominant traits (A-B-)3 showing the first dominant trait and second recessive trait (A-bb)3 showing the first recessive trait and second dominant trait (aaB-)1 showing both recessive traits (aabb)If there are deviations due to different assumptions about the phenotype of allele 'b' or other gene interactions, such as epistasis, the phenotypic ratio could be modified to 9:3:4, 12:3:1, 9:7, or 15:1.
Plants were grown in two different conditions. The plants on the left were grown with all essential nutrients required for plant development. The plants on the right were grown in a nitrogen-deficient medium. What best differentiates the abilities of the plants on the left and the right to synthesize molecules?
The main difference between the plants grown in different conditions lies in their ability to synthesize molecules, such as chlorophyll and proteins. Nitrogen, a crucial macronutrient, plays a key role in these processes. The deficiency of nitrogen can hinder plant growth, but some plants can adapt by forming symbiotic relationships with nitrogen-fixing bacteria.
Explanation:
The pivotal difference between the plants grown with all essential nutrients and those grown in a nitrogen-deficient medium is their ability to synthesize molecules essential for growth and development. Nitrogen is a key macronutrient involved in the formation of amino acids, proteins, and nucleic acids in plants. Its deficiency can significantly hamper a plant's growth.
For instance, the plants receiving ample nutrients would be able to synthesize chlorophyll effectively thanks to the availability of elements like nitrogen. On the other hand, nitrogen-deficient plants may face stunted growth and display symptoms like yellowing of leaves (chlorosis) due to reduced chlorophyll synthesis. This inability to synthesize essential molecules as a result of nitrogen deficiency hinders the overall development and growth of the plant.
However, plants have a unique ability to adapt to nitrogen-limiting conditions. Many plants form symbiotic relationships with nitrogen-fixing bacteria, such as agrobacterium, which can convert atmospheric nitrogen into a form usable by plants, thereby indirectly aiding in molecule synthesis despite the limited nitrogen supply in the medium.
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differences between mono di and polysaccharides
Answer: monosaccharides are simple sugars made up of only a single sugar molecule. Disaccharides are sugars made up of two sugar molecules linked together by a glycosidic bond while polysaccharides are complex sugars made up of many sugar molecules linked together by glycosidic bonds.
Explanation: Examples of monosaccharides are glucose, fructose, and galactose, while examples of disaccharide sugars include maltose, lactose and sucrose. Examples of polysaccharides include glycogen
and starch.
VERY VERY IMPORTANT!! NEED A CER (claim, evidence, reasoning) PLEASE HELP FAST!
All the fossils have a small layer of glaciation between them. The glaciation is also a glacier. Underneath all of the fossils is volcanic ash. The volcanic ash was from a long time ago and it was compounded together and formed together. Fossil A, B, and C are all different types of fossils, yet they are still dead creatures that went through the same stages. They died, rotted, and then sunk into the ground and eroded into the rock to form a fossil.
Which of the following composers considered himself outside the bounds of
the patronage system?
O
A. Lully
O
B. Monteverdi
C. Beethoven
O
D. Telemann
SUBMIT
"Beethoven" composer considered himself outside the bounds of the patronage system.
Answer: Option C
Explanation:
A German composer "Ludwig van Beethoven" excluded himself from patronage system as no heirs stepped forward to maintain the patronage, and even after 1815, Beethoven depended mostly on the auction of compositional assets and a small pension.
Although Beethoven before, received revenue from the publishing of his creations and from live concerts, he also relied on the patronage of income patrons, for whom he gave personal appearances and versions of the works they commissioned for an exclusive period leading up to publication.
Answer:
C
Explanation:
What symptom would you expect a patient whose large intestine is not
functioning properly to show?
A. Dehydration
B. Extreme hunger
C. Vomiting
D. Constipation
Final answer:
A patient with a malfunctioning large intestine is most likely to show symptoms of dehydration due to the inability of the intestine to properly reabsorb water, leading to chronic, watery diarrhea.
Explanation:
Symptoms of Improper Large Intestine Function
When a patient's large intestine is not functioning correctly, one major symptom they may exhibit is dehydration. The large intestine is primarily responsible for water reabsorption. If it is not working properly, the body may not reabsorb enough water, leading to frequent, watery diarrhea, which can further aggravate dehydration. This is in contrast to constipation, which occurs when too much water is reabsorbed, causing the feces to harden. While vomiting can cause dehydration, it is not primarily associated with large intestine dysfunction, and extreme hunger is not typically a direct symptom of large intestine issues. Therefore, the expected symptom for a patient with a malfunctioning large intestine is A. Dehydration.
The correct symptom that one would expect a patient whose large intestine is not functioning properly to show is:
D. Constipation
The large intestine plays a crucial role in the digestive system, primarily responsible for absorbing water from the remaining indigestible food matter and forming stool. When the large intestine is not functioning properly, it can lead to a variety of symptoms, the most common of which is constipation. Constipation occurs when the colon absorbs too much water, or if the muscle contractions in the colon are slow or sluggish, making the stool hard and difficult to pass.
Let's consider the other options:
A. Dehydration - While dehydration can be a symptom of various conditions, it is not directly related to the large intestine's function in forming stool. Dehydration might occur if there is excessive fluid loss due to diarrhea, which is a symptom of a different kind of malfunction in the gastrointestinal tract.
B. Extreme hunger - This is not typically associated with the function of the large intestine. Extreme hunger is more likely to be related to disorders of the stomach, pancreas, or hormonal imbalances affecting hunger signals.
C. Vomiting - Vomiting is usually a sign of problems in the upper gastrointestinal tract, such as the stomach or small intestine, or it can be a result of central nervous system disorders. It is not a primary symptom of large intestine dysfunction.
Therefore, the most appropriate answer to the question is D. Constipation, as it is the symptom most directly associated with a malfunctioning large intestine.
Discuss how the deletion of three nucleotides in a DNA sequence encoding a gene would affect the transcription and the resulting mRNA sequence.
Answer:
deletion is a type of mutation in the DNA which causes protein synthesis to fail.
Explanation:
the effect of this is to make a different protein instead of the correct one which will cause the organism to not have the proteins needed I. order to have the correct trait
The deletion of three nucleotides would result in the loss of one amino acid from the protein, potentially leading to a nonfunctional protein or altered protein function, while preserving the original reading frame.
The deletion of three nucleotides in a DNA sequence encoding a gene would not result in a frameshift mutation, as it is a multiple of three, which means the reading frame would remain unchanged. However, it would lead to the loss of a single amino acid in the corresponding protein because codons, which designate amino acids, are three-nucleotide sequences in mRNA. As a result, all the codons downstream of the deletion would still be read correctly, but the final protein would be missing an amino acid, which could affect the protein's structure and function, potentially leading to a nonfunctional protein or altered protein activity.
Electron microscopes use
____ in order to
allow for higher magnification and more detail when viewing specimens.
Electron microscopes use _beam of electrons___ in order to allow for higher magnification and more detail when viewing specimens.
Explanation:
A beam of electrons has a shorter wavelength than normal light used in light microscopes, by approximately a factor of X 100000. Therefore, electrons microscope have the inherent attribute of having a very high resolution. They have been used to discover very small organelles in cells such as the ribosomes and mitochondria that cannot be clearly viewed even with the highest resolution in light microscopes.
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What would happen if diploid organisms reproduce by sexual reproduction without first producing sex cells through meiosis?
If no meiosis takes place chromosome number will be doubled disturbing the genetic make up of the organism.
Explanation:
If no meiosis takes place then the resulting zygote will be of double the number of chromosomes. The genetic makeup will change entirely. The process of meiosis halves the number of chromosomes in haploid cell and maintain the serenity of organism.
The process of meiosis due to crossing over, genetic variation occurs which let the offspring receive favourable alleles to survive in new conditions.
In diploid organisms first the gametes are formed, then fertilization occurs and the diploid cell is formed which gives rise to the organism having diploid cells.
Carbonhydrates are an important of ____ compound.
Answer:
Carbohydrates are the most common type of organic compound
Explanation:
A chromosome has 13% G. What percentage of
A, C, and T does this DNA molecule have?
Answer:
a 37%
c 13%
t 37%
Explanation:
c and g go together so a must have the same as g (13%)
a and t go together so they must have equal amounts
100%-13%-13%=how much is left=74%
split this evenly between a and t
74/2=37
At the beginning of 2000 the population of the United States was 282 million people. At the beginning 2010 the population of the United States was 309 million people. Over that time period what was the average change in population per year?
Answer: A). 2.7 million people per year
Explanation:
From 2000 to 2010 is 10 years. Change in population in 10 years = population at the beginning of 2010 minus the population at the beginning of 2000. This is:
309 million -282 million = 27 million.
Therefore average change in population person year = 27 million/10 = 2.7 million per year
Serious brain injury may be caused to an infant by:
Group of answer choices
Not talking to the infant
Lack of visual stimulation
Tossing the infant in the air and catching it
Lack of intellectual stimulation
Answer:
its is either b or d
Explanation:
B or D