It is True that high levels of Pfr trigger the development of the flowering complex in long-day plants by promoting transcription of the CO gene.
What does PFR do in plants?Pfr is the bioactive form of the protein. Red light exposure causes plant bioactivity and exposure to far-red light changes Pfr to inactive Pfr form, and phytochrome activity inhibited. These two forms together represent phytochrome system
How does PFR inhibit flowering?Pfr is the bioactive form of the protein. Exposure to red light leads to physical activity in plants. In general, experimental results conclude that PFR of phytochromes is required for long-term flowering of plants. Prevents short-day plants from flowering.
What do phytochromes do in short-day plants?In short-day plants, active phytochromes (Pfr) suppress flowering. During long periods of darkness (long nights), Pfr is converted to Pr. In the absence of Pfr, flowering is unrepressed and short-day plants flower.
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QuestionWhat role does O2 play in aerobic respiration?Ait combines with acetyl-CoA at the start of the Krebs cycleBit is given off as a by-product during the oxidation of pyruvateCit combines with H2O to help drive the formation of ATPDit is the final electron acceptor at the end of the electron transport chain
The energy is released by the electrochemical gradient as the electrons are transferred from one molecule to another in etc.
During cellular respiration, a procedure known as oxidative phosphorylation occurs. The electron transport chain and chemiosmosis are two of its two component pathways. The electrochemical gradient's stored energy is utilized in chemiosmosis to create ATP-based energy molecules (Adenosine triphosphate). At the conclusion of etc., there is oxygen. In addition to picking up the protons to create water, it serves the purpose of accepting electrons. Cells use cellular respiration to break down food molecules in order to produce ATP, which serves as an energy source (ATP). Oxidative phosphorylation and the electron transport chain. Glucose oxidation processes convert NAD+ to NADH and FAD+ to FADH, these molecules absorb electrons created when glucose is oxidized.
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Consider the elements, listed, found in the human body. Which two are major components, making up at least 3% each of the human body? hydrogen n cobalt selenium O magnesium O carbon
The elements hydrogen and carbon are two major components from the listed elements making up at least 3% each of the human body.
The human body is made up of six elements, including oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus, making up about 99% of its mass. The remaining five elements, potassium, sulphur, sodium, chlorine, and magnesium, make up only around 0.85% of the total composition. Life need all 11 of them. The remaining elements are trace elements, of which more than a dozen are believed to be required for life on the basis of strong evidence. The body mass of magnesium, the least prevalent of the 11 non-trace elements, is not equal to the combined mass of the trace elements (less than 10 grammes for a human body).
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Please help
1.Substitute synonyms for these words
Allegiance, Republic, Indivisible, liberty justice
2. Rewrite the pledge of allegiance using the synonyms
an ecologist estimated 800 star-nosed moles, condylura cristata, per square mile in one woodlot and 1,600 per square mile in another woodlot. what was the ecologist comparing?
The ecologist was contrasting the star-nosed mole population densities in two separate woodlots.
What is a woodlot?A woodlot is a sparsely populated, carefully controlled forest or stand of trees, which is often larger than a grove but less than a forest. Both rural and urban regions have woodlots, which can be used for a variety of things like providing wood for building or fuel, creating a recreational area, providing a habitat for wildlife, or controlling erosion. In addition to different tree species, including coniferous and deciduous trees, shrubs and other plants may also be present in woodlots. To preserve healthy and sustainable ecosystems and guarantee the longevity of the woodlot, management of woodlots may comprise procedures like pruning, thinning, or planting new trees.
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protists belonging to clade alveolata are characterized by their unique question 3 options: cilia for locomotion. membrane-enclosed sacs just under the plasma membrane. shape for infecting hosts. pseudopodia used for locomotion and feeding. none of the above are correct.
Nuclear membranes surround the DNA of protists. They have additional membrane-bound organelles as well. Most protists are motile, or able to move, and many of them inhabit aquatic settings. Protists can reproduce sexually and/or asexually, and their life cycles are intricate.
What is protist ?Radiolarians are unicellular predatory protists that are covered with elaborate, silica-based spherical shells that are pierced with holes. Their name comes from a Roman term that means radius. They can grab prey by squeezing body parts through the openings.
Protists can have pellicules covering their surfaces and cell walls that mimic either plants, animals, or both. While some protist species employ phagocytosis to ingest food, others are photoautotrophs that use photosynthesis to store energy.
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went’s experiment differed from all previous plant tropism experiments by
Went experiment differed from all previous plant tropism experiments by "Unequal distribution of elongation promoting chemical in Avena coleoptile"
F. W. Went discovered that the elongation of the Avena coleoptile stops when the tip is severed. But when auxin was administered externally, the plant's growth was restored. According to his interpretation of the results of the trials, auxin is produced at the coleoptile tip and then moved towards gravity. It switches between the lit and the darkened sides. The shaded side has more auxin than the illuminated side. This causes the plant to slant towards the light source and grow more on its shadowed side. Positive phototropism is evident, with the lighted side exhibiting less cell elongation and the shaded side exhibiting faster cell elongation. Therefore, "Unequal distribution of elongation promoting chemical in Avena coleoptile" is the right response.
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What is the effect of leptin on the hypothalamus?
The body's fat cells create the hormone leptin. It has a direct effect on the hypothalamus, which is a major part of the brain responsible for regulating hunger, thirst, and other bodily functions.
Leptin works by telling the hypothalamus when a person has eaten enough, thus preventing overeating. It also helps regulate energy balance and metabolism. In addition, leptin affects the production of other hormones, such as cortisol and insulin, which can help control appetite, metabolism, and fat storage.The LEP gene codes for leptin. Many different types of brain and peripheral cell types express leptin receptors. These include dopaminergic neurons of the ventral tegmental area and cell receptors in the arcuate and ventromedial nuclei, in addition to other regions of the hypothalamus, which subsequently mediate eating.
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45. which one of the following factors is the main reason why atp has such a large negative free energy of hydrolysis? a) resonance stabilization of one of the products of hydrolysis b) decreased entropy of the products relative to the atp c) relief of charge-charge repulsion within atp d) increased solvation of adp and pi relative to atp e) favorable ionization of adp at ph 7
ATP has a large negative free energy of hydrolysis is a relief of charge-charge repulsion within ATP. Option C is correct.
ATP (adenosine triphosphate) has a large negative free energy of hydrolysis because it contains three negatively charged phosphate groups in close proximity to each other, which create strong electrostatic repulsion. When ATP is hydrolyzed, it is broken down into ADP (adenosine diphosphate) and inorganic phosphate (Pi), which relieves this electrostatic repulsion, resulting in a more stable, lower-energy state.
This relief of charge-charge repulsion within ATP is the main reason for its large negative free energy of hydrolysis. The other options are not the main reason why ATP has a large negative free energy of hydrolysis.
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Why are the effects of genetic drift more pronounced in smaller populations?
The effects of genetic drift more pronounced in smaller populations because of stochastic sampling error, small populations lose genetic diversity faster than big populations (i.e., genetic drift).
The population size, formally the effective population size, is connected to the population's drift strength and the risk of inbreeding. Furthermore, because the population is smaller, individuals are more likely to breed with close relatives.
Individuals in confined populations are more intimately linked to each other than individuals in prior generations. In a hypothetical population of only four individuals, for example, if two pairings each had two kids the offspring must either mate with a sibling, a parent, or an individual from the other couple.
If they pick the non-sibling/non-parent option, all kids in the third generation must mate with people who have the same grandparents or abstain from reproducing. Although this is an extreme example owing to the extremely small hypothetical population, the same patterns and dynamics may be found in bigger - albeit still small - populations.
Although the method of genetic diversity loss due to inbreeding and drift differs, the impact on populations are similar. Inbreeding and drift both limit genetic variety, which has been linked to an increased risk of population extinction, a slower population growth rate, a worse capacity to respond to environmental change, and a lower ability of released individuals to survive and reproduce in the wild.
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Which organelle converts energy found in food into a form that cells can use?
The organelle that converts the chemical energy in food into a form that cells can use is the mitochondrion. Option C is correct.
Mitochondria are the membrane-bound organelles which is found in the eukaryotic cells that play a crucial role in cellular respiration. They are often referred to as the "powerhouses" of the cell because they generate most of the cell's energy in the form of adenosine triphosphate (ATP).
Through a series of complex biochemical reactions, mitochondria convert the chemical energy in to food molecules such as glucose into ATP, which can be used by the cell to perform various functions.
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--The given question is incomplete, the complete question is
"Which organelle converts the chemical energy in food into a form that cells can use? a. nucleolus b. chromosome c. mitochondrion d. chloroplast"--
what is evidence suggests that land plants arose from within protist lineage?
Charophyte lineage as the origin of land plants. The group of green algae known as charophytes is the ancestor of all terrestrial plants, undergoing a tremendous transformation in the planet's natural history.
Existing charophytes display numerous traits that are comparable to those of land plants, and because of their generally straightforward phenotypes, they are useful study organisms for a variety of basic biological phenomena. For the study of plant cell biology, development, physiology, and ecology, several species, including Micrasterias, Penium, Chara, and Coleochaete, are useful model organisms. Charophytes are being used more frequently in new and expanding molecular investigations.
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Why are the gene pools of small populations reduced compared to those of larger populations? A. lack of advantageous traits B. lack of suitable mates C. bottleneck events D. inbreeding
Answer:
D. Inbreeding
Explanation:
D. Inbreeding is the main reason why the gene pool of small populations is reduced compared to those of larger populations. Inbreeding occurs when individuals within a small population mate with close relatives, leading to an increased frequency of homozygous (identical) alleles and a decreased amount of genetic diversity. This can lead to an increased frequency of genetic disorders and a decrease in the ability of the population to adapt to changing environmental conditions.
A bottleneck event, such as a natural disaster, disease outbreak, or human intervention, can also dramatically reduce the size of a population and result in a reduction of genetic diversity. However, the reduction in genetic diversity in a bottleneck event is generally temporary and can be restored through genetic drift and gene flow from other populations.
Lack of advantageous traits and lack of suitable mates are not directly related to the reduction of gene pool in small populations. Rather, they can result from a reduction in genetic diversity, as the limited gene pool may not contain the variation necessary for the population to evolve and adapt to changing environmental conditions.
What is the result of nondisjunction during meiosis?
Nondisjunction is an error in meiosis that occurs when chromosomes fail to separate properly during the formation of gametes.
What is chromosomes?Chromosomes are structures found in the nucleus of cells that contain genetic material. They are made up of DNA, which carries genetic information, and proteins that help to organize and package the DNA. Chromosomes come in pairs, and humans typically have 23 pairs of chromosomes, for a total of 46 chromosomes.
This can result in gametes with an abnormal number of chromosomes. For example, instead of the usual two copies of a chromosome, one of the gametes may have three copies of the chromosome. This can lead to several health problems, such as Down Syndrome and other chromosomal disorders.
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ou will be measuring respiration rate in germinating peas using co2 levels. why do you not have to take into account any photosynthetic activity that utilizes co2?
Only cellular respiration occurs in pea seeds when they start to germinate.
Cellular respiration is required for seeds to go through germination in order to get the energy they require for development and growth. Seeds lack the necessary photosynthetic capacities required to generate their own energy sources, in contrast to their mature relatives. According to several evaluations of the literature, increased levels of carbon dioxide, or [CO2], often slow down respiration rates, mostly due to a direct influence. Photosynthesis does not take place during germination because the organelles necessary for this process to happen are not present till the seed transforms into a young seedling. Some seeds can germinate even without light. This occurs as a result of the absence of chlorophyll in their cells.
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A substance that cannot be broken into a simpler substance is called:_________
A substance that cannot be broken into a simpler substance is called an element.
A basic component of matter, an element is made up of atoms with the same number of protons in their nuclei. Chemically, elements cannot be reduced to simpler substances while retaining their distinct chemical and physical properties. The periodic table lists the 118 known elements in accordance with their atomic number, electron configuration, and chemical characteristics. The element combine in different ratios to form compounds or molecules. The element is thus entity that is most simplest forming the basis chemistry. Molecules contain same element whereas the compound has the different elements combined together.
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what is the acquisition of chemical substances by organisms for the building blocks of cellular components and processes called
Nutrition is the chemical substance that is the building block of cellular components and processes.
The biochemical and physiological process that an organism uses to use food to maintain its life is known as nutrition. It offers food that living things can eat to make chemical building blocks and energy. Inadequate dietary intake is the main cause of malnutrition. Despite the fact that it frequently focuses on human nutrition, nutritional science is the study of nutrition. What nutrients an organism needs and how it gets them depends on the kind of creature it is. The consumption of organic or inorganic materials, the absorption of light, or a combination of these provide nourishment for organisms. Others must eat other species in order to consume previous nutrients, while some may produce their own diet by swallowing fundamental ingredients. All living organisms require the three fundamental molecules of carbon, energy, and water. Animals consume complex nutrients, such as proteins, lipids, and carbohydrates, found in other living things. In order to replace hunting and gathering and increase food intake, humans invented agriculture and cooking. Plants receive their nutrients from the soil and surroundings. Through the mycelium, fungi take up and assimilate nutrients from their surroundings.
The proper question is:
What is the acquisition of chemical substances by organisms for the building blocks of cellular components and processes called ?
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some bats prey on certain moths, hunting them using echolocation. some of those moths have evolved ears sensitive to the sound frequencies bats use to locate them, helping them to avoid being caught. the bats, in turn, have evolved to change the frequency they use. this interaction is an example of .
This scenario's description of the relationship between bats and moths is an illustration of coevolution. Coevolution is the process by which the evolution of two or more species is mutually influenced.
Exactly how do bats find moths and other prey?Bats navigate by using echolocation to find food insects. They produce ultrasonography, or sound waves above the audible range. Bats create sound waves, which are reflected by objects in their habitat.
What one evolutionary strategy has been used by moths to prevent being eaten by bats?Moths created an early warning system to protect themselves from the new method of attack by bats. Moths can detect bat echolocation, perform evasive flight manoeuvres, and avoid being devoured because of their adapted ears.
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cells in the eye that allow us to see color are called
Cone cells aid in the detection of colors. Most people have three different types of cone cells. Sometime referred to as color blindness, those without all three see fewer colors. Some cones are more sensitive to blue light.
Types of cellsRods, which detect dim light and are useful for night vision, and cones, which sense various hues and need intense lighting, are the two different types of photoreceptors.The primary sensor of light in the eye are cells known as rods and cones. So that the brain may create our sense of images, they communicate with it via retinal ganglion cells (RGCs).The rod mechanism has no color response. The black-and-white response that rods produce is actually a response to changes in brightness.For more information on cone cells kindly visit to
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in an isolated population of elephants, 16 percent of the individuals have large ears, a homozygous recessive condition, and 84 percent have the dominant small ears phenotype. what percentage of the population are heterozygotes?
A homozygous recessive condition, and 84 percent have the dominant small ears phenotype, percentage of population of heterozygotes is 0.36.
In an isolated population of elephants, 16 percent of the individuals have large ears, a homozygous recessive condition, and 84 percent have the dominant small ears phenotype, In a population that is in Hardy-Weinberg equilibrium, the frequency of homozygous dominant individuals is 0.36.
p = the frequency of the dominant allele in a population. q = the frequency of the recessive allele in a population. 2 p q 2pq 2pq = the frequency of the heterozygous dominant genotype. p 2 p^2 p2 = the frequency of homozygous dominant genotype.
The frequency of genotypes in a population can be represented by p2+2pq+q2= 1, with p2 equal to the frequency of the homozygous dominant genotype, 2pq equal to the frequency of the heterozygous genotype, and q2 equal to the frequency of the recessive genotype.
Homozygous and heterozygous are terms that are used to describe allele pairs. Individuals carrying two identical alleles (RR or rr) are known as homozygous. While individual organisms bearing different alleles (Rr) are known as heterozygous.
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phagocytosis, pinocytosis, and receptor-mediated endocytosis are all involved in the process of ________?
Endocytosis, the uptake of substances into a cell. There are three main types of endocytosis: phagocytosis, pinocytosis, and receptor-mediated endocytosis.
Endocytosis is a cellular process that allows cells to take in substances from the surrounding environment. Phagocytosis involves the ingestion of large particles or organisms, such as bacteria, by cells. Pinocytosis is the uptake of small amounts of fluid, including dissolved substances. Receptor-mediated endocytosis involves the binding of specific molecules to cell surface receptors, which then triggers the internalization of the molecules into the cell. All three types of endocytosis are important for cells to take in nutrients, eliminate waste, and respond to changes in their environment.
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Both carrier and _________ proteins are involved in passive transport of molecules through the cell membrane.
The remedy lies in channels. When molecules are passively transported through a cell membrane, both channel and carrier proteins are involved.
Integral proteins known as "carrier proteins" can change form in response to binding to a particular molecule to aid that molecule's transport across the cell membrane. Pumps for sodium and potassium are two examples of carrier proteins. Ion channels are a type of hydrophilic pore in the membrane that is formed by channel proteins, commonly known as ion channels. In response to an electrical or chemical stimulus, these proteins allow ions to pass across the membrane. Aquaporins and chloride channels are illustrative of channel proteins. Integral membrane proteins called carrier proteins move ions, tiny molecules, and macromolecules like proteins and carbohydrates across biological membranes. The aqueous channels that channel proteins create on the cell membrane allow for the passage of particular ions and tiny molecules. They are membrane proteins that are structurally integral to the membrane.
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The double coiled, "staircase" shape of DNA is called a double helix.A. helix
B. double helix
C. triple helix
The double coiled, "staircase" shape of DNA is called a double helix.
DNA, or deoxyribonucleic acid, is a long, thread-like molecule that contains the genetic information that is passed down from parents to offspring.
The double helix refers to the specific shape of the DNA molecule, which consists of two long strands that wind around each other in a twisted ladder-like structure.
The individual strands of the DNA molecule are made up of nucleotides, which are composed of a sugar molecule, a phosphate group, and a nitrogenous base. The nitrogenous bases, which include adenine, thymine, guanine, and cytosine, are the specific chemical units that carry the genetic information in the DNA molecule.
The double helix structure of DNA is important because it allows the molecule to be tightly packed into the cell nucleus, while still remaining accessible for processes such as replication and transcription. The discovery of the double helix structure of DNA is considered one of the most important scientific discoveries of the 20th century, and it has had a profound impact on fields such as genetics, medicine, and biotechnology. In summary, the double coiled, "staircase" shape of DNA is called a double helix.
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what role does the centromere play in cellular reproduction?
The main function of the centromere is to provide the basis for the assembly of the kinetochore, a protein complex essential for proper chromosome segregation during mitosis in cellular reproduction.
Can cells without centrosomes divide?There was strong evidence that animal cells cannot divide without centrosomes.
Why are Centromeres Important?Centromeres are important for proper segregation of chromosomes during cell division in eukaryotes. They are characterized by highly repetitive regions of DNA and associated centromeric proteins required for attachment of microtubules to chromosomes during mitosis.
What if the cell had no centromere?Without centromeres, kinetochores cannot form and cells cannot separate chromosomes. Therefore, centromeres are essential for the control of chromosome segregation and mitosis.
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in a biochemical pathway, the product released by the first enzyme becomes the substrate for the second enzyme. group startstrue or false
This statement is generally true for most biochemical pathways.
Biochemical pathways or metabolic pathways are a step by step series of interconnected biochemical reactions in which each step is catalyzed by a specific enzyme. During the series of chemical reactions, the substrate is converted into a product that in turn acts as a substrate for subsequent reaction.
In a typical biochemical pathway, the product released by one enzyme is often the substrate for the next enzyme in the pathway, and so on until the final product is produced. This sequential process is often referred to as a metabolic pathway. However, there are some exceptions where the product of one enzyme may not be the substrate for the next enzyme in the pathway.
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the lock and key model and the induced fit model are two models of enzyme action explaining both the specificity and the catalytic activity of enzymes. indicate whether each statement is part of the lock and key model, the induced fit model, or is common to both models?
The lock-and-key model and the induced-fit model are two enzyme action models that explain both enzyme specificity and catalytic activity.
Emil Fischer hypothesized the Lock and Key model of enzyme action in 1899. According to Fischer, enzymes are highly specific to the substances with which they react. The substrate(s) bind to the enzyme at the active site, resulting in the formation of an enzyme-substrate complex.The enzyme speeds up the chemical reaction. This reaction can be a synthesis reaction (bond formation) or a digestion reaction (breaking bonds to form new substances).The enzyme releases the reaction's product(s). After completing a reaction, an enzyme can be reused. The Induced Fit model of enzyme structure provides a more accurate description of enzyme structure.Daniel Koshland proposed the Induced Fit model in 1958. The active site, according to Koshland's hypothesis, is shaped similarly enough and has specific chemical properties that attract a substrate to bind. When the substrate binds, the active site is prompted to change shape.
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Which of these statements is true about the gametophyte tissue that surrounds the pine embryo?
A. It develops from the fusion of a microspore and a megaspore.
B. It functions as a diploid food reserve.
C. It functions as a triploid food reserve.
D. It functions as a haploid food reserve.
E. It is the remnant of the pollen tube.
An embryo sac is another name for a megagametophyte (female or egg-producing gametophyte). The embryo sac develops within an ovule, which is found within a flower's ovary.
The mature embryo sac is a seven-celled, eight-nucleate structure in most angiosperms. Megagametogenesis is the process by which megagametophytes mature and evolve. Megagametophytes are responsible for the production of female gametes, or eggs. These egg cells are required for pollination and fertilization. The megagametophyte of gymnosperms and the endosperm of angiosperms, which are formed before and after fertilization and have haploid and triploid genomes, respectively, may be thought of as functional homologues due to their functions as a source of nutrients for the growing embryo.
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What is the role of crossing over in genetic variation?
Crossing over creates gametes that contain new combinations of genes in order to prevent genetic diversity.
In general , crossing over works in the process of creating gametes that contain new combinations of genes, that helps to maximize the genetic diversity in the future offspring are the result of consequent association of two gametes during se.xual reproduction.
Hence , Crossing over is a cellular process which happens at the stage of meiosis when chromosomes of the same type are lined up. Also when chromosomes from the mother and father line up they takes place in crossing over .
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once a potato is placed in a more and more hypotonic solution it gains less and less weight. this is called turgor pressure. explain what is happening with respect to the water molecules and cell walls of the plant?
Once a potato is placed in a more and more hypotonic solution, it gains less and less weight because the amount of solute inside the potato is moved into the solution to reach equilibrium.
A hypotonic solution is a kind of solution which has lower solute concentration than the one being compared with, here potato. As per the query, potato is placed in a hypotonic solution. This means that the potato has a larger solute concentration than this hypotonic solution. Now, both the concentrations would try to reach equilibrium in both of their, solute and solvent, aspects. Thus, the potato becomes lighter as the amount of its solute is moved into the solution.
This happens as follows: water molecules cluster around solutes, pushing them away, allowing more water molecules to enter the region of concentration. As a result, adding a hypotonic solution to a hypertonic solution will cause the mixture to experience highs and lows in concentration at first before quickly coming to equilibrium.
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Someone help me, please
The bacteria and archeans are not eukaryotes.
Are bacteria and Archeans both Eukaryotes?The bacteria and archeans are not eukaryotes. Eukaryotes are a type of organism that have complex cells with a true nucleus and other membrane-bound organelles, while bacteria and archeans are prokaryotes, which have simpler cells without a nucleus or membrane-bound organelles.
Bacteria are single-celled microorganisms that are found everywhere in the world, and they play important roles in many ecosystems. Bacteria are diverse and can range from pathogens that cause diseases to beneficial species that help break down organic matter and promote soil fertility.
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what organelle protects all eukaryotic cells from toxic substances or toxic by-products of chemical reactions?
The peroxisome is an organelle that shields eukaryotic cells against hazardous chemicals or toxic byproducts of chemical reactions.
Peroxisomes contain enzymes that convert hazardous chemicals like hydrogen peroxide into innocuous byproducts that may be safely excreted from the cell. This aids in the prevention of harmful buildup of compounds that might harm the cell and interfere with its regular processes. Peroxisomes are also engaged in other metabolic activities, such as fatty acid degradation and the creation of specific kinds of lipids.
Fatty acids are compounds made up of chains of carbon atoms connected together by hydrogen atoms. They provide vital energy to the body and may be found in foods such as fish, nuts, and oils.
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