Reproduction and survival are not decided by chance.
What is the underlying theory behind animal natural selection?An evolutionary mechanism is natural selection.Environment-adapted creatures are more likely to endure and pass on the genes that made them successful. This technique eventually causes species to evolve and diverge.
What is synthetic selection? the theory of Darwin?The act of identifying desirable traits in plants and animals and taking steps to strengthen and pass those traits on to succeeding generations is known as artificial selection.
What is an illustration of natural selection at work?The development of giraffes' long necks is a prime illustration of natural selection at work. Modern giraffes' ancestors were antelope or deer-like creatures.
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how are leukocytes (neutrophils and macrophages) signaled where to leave the circulation and enter the infection site? g
They do this by diapedesis, a process in which the leukocyte travels ameboid-like via closely apposed endothelial boundaries (paracellular transmigration) and, in some circumstances, through the endothelial cell itself (transcellular migration).
Neutrophils are generally present in the bloodstream, but they move quickly to infection sites in tissue. The trans-endothelial migration (TEM) of neutrophils can proceed either directly via individual endothelial cells (the transcellular pathway) or between them (the paracellular route)
Leukocytes move via gaps between blood vessel cells, and the process of attachment to transit through the blood vessel wall is referred to as diapedesis. Diapedesis is followed by a migration of leukocytes toward infection sites defined by a high concentration of inflammatory proteins.
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What 3 things can be found in a scientific argument? in geology on mars
PLEASE HELP I NEED TO SUBMIT SOON
Answer:
Explanation:
The confirmation that liquid water once flowed on Mars, the existence of nutrients, and the previous discovery of a past magnetic field that protected the planet from cosmic and solar radiation, together strongly suggest that Mars could have had the environmental factors to support life.
foods that are moderate-to-high on the glycemic index increase muscle glycogen more quickly than foods low on the glycemic index. true false
non-homologous chromosomes in an organism with the same length and same centromere position cannot be distinguished by any available techniques.
What do you name chromosomes that are the same length?
Homologous chromosomes are made up of chromosome pairs that have roughly the same length, centromere position, and staining pattern for genes with the same corresponding locus
What are homologous chromosomes defined as?The 23 pairs of the 46 chromosomes that make up a human cell are said to be homologues of one another (with the slight exception of the X and Y chromosomes; see below). When only one homologous chromosome from each pair is present in human sperm and eggs, this is referred to as having haploid X and Y chromosomes, correct?
what is X and Y chromosomes,?Your gender at birth is determined by two chromosomes (the X and the Y chromosome). They are known as sex chromosomes: Females have two X chromosomes. Males have one X and one Y chromosome.
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When two non-homologous chromosomes with the same length and centromere position divide during mitosis, it is known as the metaphase stage.
What does a human's chromosome make up?Genomic information is transported from cell to cell via chromosomes, which are threadlike structures consisting of protein and a single DNA molecule. Chromosomes are found in the cell nucleus of all plants, animals, and humans.
What is the name for the 23 sets of chromosomes?In humans, there are typically 46 chromosomes, or 23 pairs, in each cell. There are 22 of these pairs, known as autosomes, and they share a similar appearance in both sexes. Sex chromosomes, the 23rd pair, are different in males and females.
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why might an investigator conduct laboratory tests on unburned control material collected from a fire scene? what instrument is most often used to detect and characterize recovered flammable residues?
An investigator conduct laboratory tests on unburned control material collected from a fire scene to analyze the breakdown products A gas chromatograph is most often used to detect and characterize recovered flammable residues.
Laboratory tests, Analyses of the breakdown products produced by the material's exposure to intense heat during the fire can be performed in the laboratory on unburned control material. Analytical chemistry commonly employs gas chromatography for the separation and analysis of compounds that can be vaporized without decomposition.
The gas chromatograph is the most delicate and solid instrument for distinguishing and portraying combustible buildups. Accelerants like gasoline and kerosene are what start the majority of arsons.
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Cholesterol is one of the most important steroids in the body. Which kind of cholesterol is identified as good cholesterol?.
Doctors classify cholesterol into low-density lipoprotein (LDL) and high-density lipoprotein (HDL). Doctors commonly call HDL cholesterol the “good” kind of cholesterol, because it circulates in the blood and removes excess, unwanted cholesterol. LDL cholesterol is the type that can lead to buildup in the body’s arteries.
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the hydrophobic effect: a. does not occur in biological membranes. b. only occurs with amphipathic molecules. c. results from attractive forces between hydrophobic molecules. d. is driven by an increase in entropy of water molecules.
Answer: d. is driven by an increase in entropy of water molecules.
When these hydrophobic surfaces coalesce and exclude water (as the protein folds), the ordered water molecules become disordered and return to the bulk solvent. The resulting increase in the water molecules' entropy is the thermodynamic driving force behind the hydrophobic effect.
This energy is then used to move hydrogen ions from the matrix through the protein complexes into the intermembrane space. Draw blue arrows to show the movement of hydrogen ions across the membrane. Cross off the hydrogen ions in the matrix and draw them in the intermembrane space.
The energy is called as electron transport chain then used to move hydrogen ions from the matrix through the protein complexes into the intermembrane space.
The electron delivery chain is a chain of 4 protein complexes that couple redox reactions, growing an electrochemical gradient that results in the advent of ATP in a whole machine named oxidative phosphorylation. It takes place in mitochondria in each mobile breathing and photosynthesis. The procedure of forming ATP from the electron delivery chain is called oxidative phosphorylation.
Electrons carried through NADH + H+ and FADH2 are transferred to oxygen thru a chain of electron carriers, and ATPs are fashioned. Three ATPs are fashioned from every NADH + H+, and ATPs are fashioned for every FADH2 in eukaryotes Electron transport. During electron delivery, electricity is used to pump hydrogen ions throughout the mitochondrial internal membrane, from the matrix into the intermembrane space.
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Which substance is the chemical food source for the soybean plants? O glucose O sunlight O water O carbon dioxide
Answer:
glucose
Explanation:
all plants need to create glucose through photosynthesis in order to make atp
Predict whether a strawberry placed in concentrated saltwater will gain or lose water due to osmosis. Defend your prediction.
Answer:
i need points
Explanation:
Which of the following is not a principle of natural selection? Evolution will occur as an organism gets older. and learns more Most species produce more offspring than will actually survive Organisms compete for limited resources adaptations allow some organisms to survive and rcproduce bctter than In every population; others
Thus, according to Charles Darwin's many conceptions of natural when each species tries to generate a greater number of offspring in order to ensure the reproductive survival of the species.
Charles Darwin wrote Original Species, the first scientific work to discuss natural selection. Therefore, if they have as many offspring as possible, at least some of them will live. And when the reproductive population is large and there are few natural resources available, competition for those few resources begins. Nature forbids offspring growth that exceeds carrying capacity. As a result, reproductive fitness improves.
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which of the following scenarios would lead to a negative membrane potential? assume for each case that the appropriate leaky channel is present in the cell's membrane (select all that apply). group of answer choices k concentration outside cell > inside k concentration inside cell > outside cl- concentration outside cell > inside cl- concentration inside cell > outside
K+ concentration inside cell > outside
Cl= concentration outside cell > inside
The membrane's uneven distribution of positive ions causes the resting potential to be negative; 3 Na+ are pumped out of the cell for every 2 K+ that enter, making the inside of the cell less positive than the exterior.
K+ channels shut down. Na+ channels go from being inactive to being closed. K + concentration inside cell > outside In both the central and peripheral nervous systems, the leak K+ channels generate background K+ currents that control cell excitability.
Ion channels that are non-gated are constantly open. These channels are also known as "leak" channels because they do not impose any resistance on the ions as they pass through them.
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Parkinson disease (PD) is a neurodegenerative disease that has been associated with a significant number of different genes, therefore showing it to be genetically heterogenic. One recent study in 278 families found evidence of two such possible loci. Evidence for linkage to chromosome 18q11 was presented by Gao et al. in 2009. Which of the following would be considered reputable evidence for this?
analysis of all other possible SNPs with no such association to chromosome 18
finding the locus to be in Hardy-Weinberg equilibrium in the population
finding the Lod score for association between the chromosomal location and PD to be 4.1
use of persons from multiple ethnic and geographic backgrounds in the study
lack of quantitative difference for the occurrence of both in individuals
The correct answer D) finding the Lod score for association between the chromosomal location and PD to be 4.1.
Parkinson's disease is a progressive neurological disorder that affects the nervous system and nerve-controlled parts of the body. The symptoms emerge in stages. A slight tremor in only one hand could be the first symptom. Tremors are common, but the disorder can also cause stiffness or slow movement.
In the early stages of Parkinson's disease, your face may be expressionless. When you walk, your arms may not swing. Your speech may become slurred or soft. Parkinson's disease symptoms worsen as the disease progresses.
Although Parkinson's disease cannot be cured, medications can help you feel better. Occasionally, your doctor may recommend surgery to control certain areas of your brain and alleviate your symptoms.
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Full question
Parkinson disease (PD) is a neurodegenerative disease that has been associated with a significant number of different genes, therefore showing it to be genetically heterogenic. One recent study in 278 families found evidence of two such possible loci. Evidence for linkage to chromosome 18q11 was presented by Gao et al. in 2009. Which of the following would be considered reputable evidence for this?
A) lack of quantitative difference for the occurrence of both in individuals
B) use of persons from multiple ethnic and geographic backgrounds in the study
C) finding the locus to be in Hardy-Weinberg equilibrium in the population
D) finding the Lod score for association between the chromosomal location and PD to be 4.1
E) analysis of all other possible SNPs with no such association to chromosome 18
which activated monosaccharide donor substrate is used in the reaction that directly forms lactose in the mammary gland?
The mammary gland has the unique ability to synthesize lactose through an enzyme called lactose synthase. Lactose synthetase joins two monosaccharides (monosaccharides), glucose and galactose, through beta 1-4 linkages to form the disaccharide lactose.
A glandular organ in the chest. The mammary glands are made up of tissue containing connective tissue, fat, and glands that can produce milk. Also called chest. The main function of the organ is lactation. It is present in both sexes, but is well developed in females and rudimentary in males. It is also an important accessory organ of the female reproductive system. The mammary glands, located above the large pectoral muscles of the chest, are present in both males and females, but are usually only functional in females. Externally, each breast has a raised nipple, surrounded by a circular, pigmented area called the areola. These glands have several parts that work together to produce and secrete milk.
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synthetic biologists are trying to create cells from raw material. one step in the process is encapsulating genetic material into a compartment. researchers of the origin of life think that the earliest cells on earth may have used rna as their genetic material instead of dna. as biologists consider which genetic material to use in creating their synthetic cells, which of the following characteristics of a single-stranded rna genome should they keep in mind?
The characteristic of a single-stranded RNA genome that should be kept in mind is b) a newly synthesized RNA strand is not identical to the template strand.
RNA can be described as a nucleic acid molecule that is made up of a single strand. On the other hand, DNA can be described as a nucleic acid molecule made up of two strands.
Synthetic biologists, when considering single-stranded RNA genomes should keep in mind that a newly synthesized RNA strand cannot act as a template strand for forming another nucleotide strand. This is because the information on the RNA strand will be decoded only by the formation of amino acids. Hence, the RNA molecule will not be able to serve as genetic material for synthetic biologists.
Although a part of your question is missing, you might be referring to this question:
Synthetic biologists are trying to create cells from raw materials. one step in the process is encapsulating genetic material into a compartment. researchers of the origin of life think that the earliest cells on earth may have used RNA as their genetic material instead of DNA. as biologists consider which genetic material to use in creating their synthetic cells, which of the following characteristics of a single-stranded RNA genome should they keep in mind?
a) RNA genome will be unstable
b) a newly synthesized RNA strand is not identical to the template strand
c) RNA genome will become double-stranded
d) RNA genome will not be transferred
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Chemoreceptors located in the aortic and carotid bodies stimulate the respiratory control center in the brain when the blood __________ decreases.
When the blood pH drops, chemoreceptors in the aorta and carotid bodies activate the brain's respiratory control center.
What are the measurements made by chemosensors present in the circulatory system and body?Chemoreceptors monitor the amounts of hydrogen ions in the blood to determine the quantities of carbon dioxide there.
What circumstance would the respiratory centers encourage more ventilation in?Peripheral chemoreceptors that detect falling or more acidic pH levels trigger increased ventilation to accelerate the removal of carbon dioxide from the blood. The body's medulla, which houses the body's respiratory center, is typically stimulated by an increase in carbon dioxide concentration and, to a lesser extent, by a decrease in oxygen levels in arterial blood.
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TRUE/FALSE. the uti membrane test utilizes proprietary chemicals to produce a color reaction to aid in identification of a gram-positive urinary tract infection.
This is TRUE when the uti membrane test uses specialized chemicals to generate a color reaction that helps identify a gram-positive urinary tract infection.
A UTI may self-resolve.
Although some infections are different from others, he adds, "Yes, a UTI could go away on its own." Additionally, it might last longer if untreated. Uncomplicated UTIs, commonly known as cystitis, and complicated UTIs, which may be catheter-related or occur during pregnancy, are the two main kinds.
What treatment for urinary tract infection is most effective?The first line of defense against urinary tract infections is typically antibiotics. Which medication is prescribed and for how long depends on your health and the type of bacteria discovered in your urine.
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when the two receptors bind to the dna half-sites of the hormone response element, they form a heterodimer.when the two receptors bind to the dna half-sites of the hormone response element, they form a heterodimer.
A heterodimer is created when two receptors attach to the hormone response element's DNA half-sites.This is a combination of two separate kinds of molecules that control the expression of genes.
Haemoglobin (shown), the NMDA receptor, some aquaporins, some AMPA receptors, and some enzymes are examples of heterotetramers.
Depending on the type of receptors and the precise sequence of the hormone response element, the binding of the heterodimer to the hormone response element can either activate or inhibit the production of particular genes.
Numerous physiological processes, such as growth and development, metabolism, and the body's reaction to external stimuli, are controlled by this mechanism.
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Help I don’t know thissss
the answer is silk
Explanation:
from which component of the light-dependent reactions does nadph form most directly? group of answer choices photosystem ii photosystem i cytochrome complex atp synthase
The most direct formation of NADPH occurs in the photosystem I component of light-dependent processes.
what is light dependent reactions?
The energy store molecule ATP and the reduced electron carrier NADPH are two molecules produced by the light-dependent processes that are required for the next phase of photosynthesis. The light processes are crucially influenced by photosystems, sizable protein and pigment (light-absorbing molecule) complexes that are designed to capture light. The two different kinds of photosystems are the PSI and the PSII.
In other words, the electron transfers between PSII and PSI and between PSI and NADPH are only energetically "downhill" (energy-releasing, and hence spontaneous) because the electrons in P680 and P700 are given a boost to extremely high energy levels by the absorption of energy from light.When a photon from PSII strikes PSI and ignites it, NADP (oxidised adenosine diphosphate phosphate) will reduce to NADPH. The most traditional method of NADPH has to be PSI.
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Please help! a horticulturalist wants to produce geraniums with specific characteristics. she knows that the trait of red flowers is governed by the allele r(rr and rr) and the trait of white flowers is governed by the allele r(rr).
the horticulturalist plans to cross a geranium that is heterozygous for red flowers with a geranium that is true-breeding for white flowers. which punnett square best describes this cross?
A.R | r |
R |RR|Rr
r |Rr|re
B. r|r
R|Rr|Rr
r|rr| rr
C. R|r
R|RR|Rr
R| RR|Rr
The horticulturalist plans to cross a geranium that is heterozygous for red flowers with a geranium that is true-breeding for white flowers. Option B Punnett square best describes this cross.
What is Punnett square?Punnett square is defined as an illustration in the shape of a square that is used to forecast the genotypes of a certain cross or breeding experiment. A square that has been divided into four quadrants is the Punnett square.
Knowing that the red flower must possess at least one dominant allele in order to be red, we may infer that it could either be Rr or RR. All progeny with the genotype Rr would be red if the white geranium (rr) and RR were crossed. On the other hand, if the flower is Rr and it is crossed with rr, the resultant plants will have a split floral coloration, with half having red blooms and the other half having white flowers.
Thus, the horticulturalist plans to cross a geranium that is heterozygous for red flowers with a geranium that is true-breeding for white flowers. Option B Punnett square best describes this cross.
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true or false: the use of technology to modify organisms, cells, and their molecules to achieve practical benefits, primarily in agriculture, human health, and forensic science is referred to as biotechnology.
The correct option is true. Biotechnology is a branch where various cells and organisms are modified using the technology.
In its most basic form, biotechnology is simply technology based on biology; it uses cellular and biomolecular processes to create products and technologies that enhance both our quality of life and the health of the world. Moreover, early uses of biotechnology resulted in the creation of goods like bread and vaccinations. Nevertheless, the field has developed greatly over the past century in ways that allow for manipulation of the genetic makeup and biomolecular functions of living things.The most common method used by modern biotech applications is genetic engineering, sometimes referred to as recombinant DNA technology. The genetic cell structures are altered or interacted with in genetic engineering. Any animal or plant has genes that make proteins in every cell. The traits of the organism are determined by those proteins.
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During fermentation, most of the pyruvate produced during glycolysis is used to convert nadh to.
To create acetaldehyde, pyruvate is first decarboxylated (CO2 exits). Then, acetaldehyde is transformed into ethanol with the aid of hydrogen atoms from NADH + H+.
What function does NADH, a byproduct of glycolysis, serve?NADH helps with the oxidation of glucose by contributing to oxidation in cell processes like glycolysis. The TCA cycle, which occurs during aerobic cellular respiration, provides the energy stored in this reduced form of the coenzyme NADH, which fuels the electron transport function in the membranes of mitochondria.
What and where does pyruvate get transformed to?A multi-enzyme complex transforms pyruvate into acetyl CoA once it enters the mitochondrial matrix. One molecule of NADH is created at the same time that carbon dioxide is released.
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Living organisms can be classified as prokaryotes or eukaryotes. Which two structures are common to both prokaryotic and eukaryotic cells?.
Answer:
The cells of all prokaryotes and eukaryotes possess two basic features: a plasma membrane, also called a cell membrane, and cytoplasm.
Explanation:
Explain the role of photosynthesis in the pond ecosystem. In your explanation, discuss whether or not the organisms that daniel studied depend on photosynthesis, either directly or indirectly.
We can infer from the proposed food chain of algae-snail-sunfish-heron that photosynthesis plays a significant role in this food chain.
While snails, sunfish, and herons are indirectly dependent on photosynthesis, algae are the only organisms that rely on it directly for survival. Since we're talking about a food chain, it basically means that all living things are interconnected. The snail uses the algae as food, the sunfish eats the snail later, and the heron consumes the sunfish. As a result, the algae produce photosynthesis for their own life.If the algae, for some reason, are unable to carry out photosynthesis, then they will eventually die off. If the algae die off, then the snail will also perish for lack of food, and if the sunfish also perishes for lack of food, then the heron also perishes.Therefore, we can draw the conclusion that photosynthesis, whether directly or indirectly, essential for the existence of all four species.
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k-selected species typically follow a type i or type ii curve and r-selected species typically follow a type iii curve. which of the above survivorship curves best applies to wild turkeys? justify your answer with evidence and reasoning.
On type-1, wild turkey curves are applicable .this type is in k-selected species.
The population of K-selected species grows slowly until it approaches the carrying capacity (K) of the land due to their low intrinsic growth rates. They often have huge species, mature relatively late, have few, large offspring, and give their children a lot of parental care. Once established, their population dynamics have a tendency to stabilize and stay close to the land's carrying capacity. The populations of r-selected species, on the other hand, frequently face enormous overshoots in carrying capacity followed by massive die-offs due to their high intrinsic growth rates. They often have few, tiny offspring, are little organisms, and give little to no parental care.
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some biologists prefer to focus efforts on preserving endangered species while others prefer to focus on preserving ecosystems. what is your advice to biologists that are choosing which way to follow?
There are strong justifications for both strategies; no one method is the best. It is impossible to conserve orangutans without also conserving their ecology in a situation like the Borneo orangutans. On the other hand, saving a piece of forest is considerably harder to accomplish than saving a charismatic creature like an orangutan. The relative relevance of each sort of effort will vary depending on the situation.
What is Ecosystem?
An ecosystem is made up of all the living things—plants, animals, and other organisms—that may be found in a specific location and how they interact with one another and their non-living surroundings. Each organism in an ecosystem has a certain niche or function to perform.
The health of the entire Earth system is determined by ecosystems, which are the basis of the biosphere.
English botanist Sir Arthur George Tansley is credited with introducing the idea of the ecosystem to biology.
Phylum, phylogeny, and ecology are just a few of the terms that Ernst Heinrich Philipp August (1834–1919), a German biologist, naturalist philosopher, physician, professor, marine biologist, and artist, invented. He also discovered, described, and named thousands of new species and mapped a genealogical tree connecting all life forms.
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Primordial germ cells in zebrafish follow a migratory path that is directed by which of the following? Pick the best answer.
a. Estrogen and fibronectin
b. Steel factor and estrogen receptor
c. SDF-1 and CXCR4
d. Testosterone and androgen receptor
Primordial germ cells in zebrafish follow a migratory path that is directed by SDF-1 and CXCR4.
In zebrafish, primordial germ cells migrate along a path directed by SDF-1.
SDF-1 is another name for stromal cell-derived factor-1. It also promotes the mobilization and migration of hematopoietic cells in many mammals. However, in the zebrafish, SDF-1 guides primordial germ cell migration, which results in the formation of bleb-like protrusions via cytoplasmic flow.
The axis is linked to MSC migration and homing in vivo. MSCs transplanted into the body migrate to wounded tissues and focus on promoting tissue regeneration. SDF-1 regulates repair activity as well as the migration and homing of CXCR4-positive MSCs to damaged tissues.
Primordial germ cells are particularly specialized cells that serve as the progenitor cells for gametes, which progress after meiosis as haploid sperm and eggs that fertilize to produce new organisms.
They pass on genetic and epigenetic data from generation to generation, ensuring species survival.
In mammals, it is induced by BMP signals from the surrounding tissue in a subset of cells in the peri-implant epiblast.
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circulating naive t cells gain access to lymph nodes through high endothelial venules (hevs), which are located where?
Circulating naive t cells gain access to lymph nodes through high endothelial venules (hevs), are located in Cortex .
What is Cortex?
The cortex, also referred to as the cerebral cortex, is the region of the mammalian brain closest to the outside of the cerebrum. The anatomical term "cortex" refers to the body's outer layer. In reality, the frontal portion of the cortex, which is where higher cognitive functions are located, is where the majority of our intellect actually resides. Additionally, it is the final area of the brain to grow both developmentally and evolutionarily. The heart is the only organ in the human body without a "cortex," since others like the kidneys and ovaries also have an outer layer.
In anatomy, the outside portion or layer of a certain internal organ or tissue is often referred to as the cortex. The cerebral cortex serves as one example. The outermost layer of a vertebrate's cerebrum is called the cerebral cortex. The renal cortex is another another. The kidney's periphery is known as the renal cortex. The cortex in botany refers to the stem and root tissue that extends outward toward the vascular tissues. In some plants, it could be situated halfway between the vascular tissues and the epidermis. The cortex is found in woody plants sandwiched between the periderm and vascular tissue, particularly phloem. Therefore, the cortex is a part of the bark of the tree.
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consider a negatively charged protein adsorbed on anion-exchange gel at ph 8. (a) how will a gradient from ph 8 to some lower ph be use- ful for eluting the protein?
The protein becomes protonated as the pH is dropped, which results in a reduction in the negative charge's intensity. Protein retention weakens over time.
Ionizable compounds are separated using ion exchange chromatography according to their overall charge. Because the charge carried by the target molecule can be easily controlled by altering buffer pH, this technique makes it possible to separate comparable sorts of molecules that would be challenging to separate by other techniques.
To separate charged biological components like proteins, peptides, amino acids, or nucleotides, ion exchange chromatography is frequently utilized. Protein is made up of amino acids, which are zwitterionic substances that have both positively and negatively charged chemical groups. Proteins can have a net positive charge, a net negative charge, or no charge depending on the pH of their surroundings. The isoelectric point, or pI, of a molecule, is the pH at which there is no net charge.
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