Two hockey players are skating on a frozen pond. One skater falls through the ice into the water.
Explain how negative feedback can keep the skater who fell in alive. Explain how positive
feedback can provide physical assistance to the friend trying to save him.

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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Chargaff found that the proportion of T to A in DNA from any source was equal. C also had the same value as G. Although he might have believed that these ratios implied that T and C were always physically coupled or connected to one another and to G, he did not make this claim.

The first thing Chargaff noted was that DNA, whether it was taken from a plant or an animal, had the same amounts of adenine, thymine, cytosine, and guanine. These similarities gave us information on the chemical combinations that make up the double helix.

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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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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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To create acetaldehyde, pyruvate is first decarboxylated (CO2 exits). Then, acetaldehyde is transformed into ethanol with the aid of hydrogen atoms from NADH + H+.

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.

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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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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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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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

the answer is silk

Explanation:

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.

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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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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Answer:

glucose

Explanation:

all plants need to create glucose through photosynthesis in order to make atp

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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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.

When the blood pH drops, chemoreceptors in the aorta and carotid bodies activate the brain's respiratory control center.

Chemoreceptors monitor the amounts of hydrogen ions in the blood to determine the quantities of carbon dioxide there.

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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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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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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Answer:

The cells of all prokaryotes and eukaryotes possess two basic features: a plasma membrane, also called a cell membrane, and cytoplasm.

Explanation:

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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Answer:

i need points

Explanation:

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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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.

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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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.

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.

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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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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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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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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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

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?

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.

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.

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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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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