which element is important in directly triggering contraction?

A pair of chromosomes inherited from the mother and the other pair from the father is called a homologous chromosome pair.

Homologous chromosomes are similar in size, shape, and gene content and carry the same genes at the same loci, although the specific alleles may differ. In humans, the homologous chromosome pairs form the 23 pairs of chromosomes that contain the genetic material necessary for the development and functioning of the organism.

During sexual reproduction, each parent contributes one set of chromosomes, including one member of each homologous chromosome pair, to their offspring. The process of meiosis ensures that each gamete receives one member of each homologous pair, resulting in genetic diversity in the offspring.

This means that the genetic material inherited from the mother and father are combined in their offspring, leading to genetic variation within a population. The study of homologous chromosomes is essential for understanding genetics, inheritance patterns, and evolutionary biology.

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Answer:

Which example is an abiotic factor of a desert environment?

* rattlesnake

* scorpion

* cactus

* sand ​

Explanation:

Sand is an abiotic factor of a desert environment. Abiotic factors are non-living physical and chemical components of an ecosystem, such as water, sunlight, soil, and temperature.

True. Melanocytes located in the stratum create melanin.

The main product of melanocytes, which are descended from neural crest cells, is melanin, which gives skin its colour. They generate melanin and are situated between stratum basale cells. As a built-in sunscreen, UVB light induces the release of melanin, which protects against UV radiation. The topmost layer of skin of your body is called the epidermis. It defends your body from damage, keeps you hydrated, regenerates skin cells, and contains melanin, that gives your skin its colour. The melanocyte, which is found in the deep layers of very skin and where melanin & carotene combine to produce overall skin colour in addition to the colour of the eyes and hair, is the primary site of melanin formation.

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The correct answer is during exercise ,glycogen stored in non-exercising muscles help preserve blood glucose levels.

During exercise,  glycogen is stored in non-exercising muscles help preserve blood glucose levels. Glycogen is a storage polysaccharide in animals that is composed of glucose molecules. It is stored in the liver and muscles and is used to provide energy during periods of intense physical activity or fasting. Therefore, during exercise, glycogen stored in non-exercising muscles help preserve blood glucose levels.

This statement is most accurate as blood glucose levels are crucial to maintain energy production during exercise. Glycogen is broken down to release glucose that helps to keep the glucose levels up during the exercise. Hence, the statement "During exercise, glycogen stored in non-exercising muscles help preserve blood glucose levels" is the most accurate statement among the given options.

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The events in the sequence in which they occur during muscle contraction are: electrical excitation of the muscle cell membrane excitation-contraction coupling sliding of myofilaments. Therefore the correct sequence is option D.

Muscle contraction takes place through a series of events that lead to the sliding of actin and myosin filaments in sarcomeres. The sequence of events leading to muscle contraction is as follows:

1. Electrical excitation of the muscle cell membrane.

2. Excitation-contraction coupling.

3. Sliding of myofilaments. The sequence of events that occur during muscle contraction is important to understand because it provides a better understanding of how the muscle fibers function.

The final step in muscle contraction is the sliding of myofilaments, which occurs due to the interaction between the actin and myosin filaments. This sliding of myofilaments leads to the shortening of the sarcomere, resulting in muscle contraction. Therefore the correct sequence is option D.

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The option which poses a severe and random policy risk to company personnel and assets and interrupts the conduct of business is terrorism. Terrorism is intimidation against people and property. Thus, the correct option is B.

Terrorism refers to the use of force and intimidation against people or property to coerce or intimidate governments or societies, often to advance ideological, political, or religious objectives. It is frequently used as a tactic by extremist groups with a violent agenda.

Terrorism poses a severe and random policy risk to company personnel and assets and interrupts the conduct of business. In today's globalized economy, where corporations operate in various parts of the world, the threat of terrorism is greater than ever. It also threatens the supply chain by making it more challenging to transport goods from one location to another.

A terrorist attack on a company's facilities or employees could cause significant losses, including reputational harm, financial loss, and even loss of life. As a result, businesses must take measures to protect themselves against terrorist attacks.

Therefore, the correct option is B.

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Based on the characteristics of the microbe, the planet can be described as cold, acidic, and low in oxygen if the prokaryotic cell is a psychrophile, an acidophile, and a microaerophile.

The prokaryotic cells do not have a nucleus or any membrane-bound organelles. A psychrophile is an organism which thrives in cold temperatures. However, acidophiles are organisms that thrive in acidic conditions and microaerophiles are organisms that require low levels of oxygen to survive.

Hence, based on the characteristics of the microbe it can be concluded it probably came from a planet which is cold, acidic and has low oxygen levels.

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Double circuit improves the efficacy of circulation and high pressure pushes the blood in the lungs and the body and is thus better than a single circuit heart.

Blood is delivered to the two atria from two separate circuits (the lungs and the systems). The efficiency of oxygenation is decreased by some blood mixing in the ventricle of the heart. This configuration has the benefit of pushing blood to the body and lungs through the arteries' high pressure.

The heart is also divided into four chambers in mammals and birds: two atria and two ventricles. Because mammals and birds have warm-blooded lifestyles, the oxygenated blood is separated from the deoxygenated blood, which increases the effectiveness of double circulation. Birds and mammals' four chambered hearts diverged from three chambered hearts on their own.

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Acquisition of new characteristics by the host cell is Transduction of specific genes and Immunity to reinfection by the same phage. Therefore the correct option is option B and C.

Lysogeny is a process in which a virus (bacteriophage) infects a bacterial cell and inserts its genetic material (DNA) into the bacterial chromosome without immediately destroying the host cell. The integrated viral DNA is known as a prophage, and the host cell is known as a lysogeny.

During this period, the bacterium divides, and the virus genetic material is transmitted to each of its daughter cells along with the bacterium genetic material. The lysogeny bacteria will continue to produce the viral DNA but not the virus's structural proteins.

This process results in immunity to reinfection by the same phage, but not by any other phage. Thus, lysogeny can result in transduction of specific genes and immunity to reinfection by the same phage. Therefore the correct option is option B and C.

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The event that immediately precedes activation of S-phase cyclin-Cdk (Cyclin-dependent kinase) is the completion of DNA replication licensing.

During the G1 phase of the cell cycle, the replication licensing complex (RLC) attaches to DNA and licenses it for replication. The RLC consists of multiple proteins, including the origin recognition complex (ORC) and the mini-chromosome maintenance (MCM) complex. During the G1/S transition, the RLC is activated, and the MCM complex is loaded onto DNA, which initiates the process of DNA replication.

Once the licensing process is complete, S-phase cyclin-Cdk is activated, which triggers DNA synthesis and entry into the S phase of the cell cycle. The activation of S-phase cyclin-Cdk also leads to the degradation of the RLC, ensuring that DNA replication occurs only once per cell cycle.

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Nigeria  has the lowest rate of mental illness.

It is difficult to accurately determine which country has the lowest rate of mental illness due to the challenges in defining and diagnosing mental illness, variations in data collection methods, and differences in cultural attitudes towards mental health. However, there are some studies that have attempted to compare the prevalence of mental illness across countries.

One study published in the journal BMC Medicine in 2013 analyzed data from the World Health Organization's World Mental Health Survey and found that Nigeria had the lowest prevalence of mental illness among the countries included in the survey. However, it's important to note that the study only included a subset of countries and may not be representative of the entire world.

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The correct answer is C: making climates more extreme. Global climate change has been studied and found to have many effects, but one of the most notable is the increasing intensity of extreme climates.

Climate change is a phenomenon caused by the buildup of greenhouse gases, such as carbon dioxide, in the Earth's atmosphere. Biomes are vast areas of the Earth's surface that share similar climatic and environmental characteristics. The taiga, tundra, desert, savanna, temperate deciduous forest, tropical rainforest, and grassland are examples of biomes. Biomes differ from one another in terms of precipitation, temperature, soil quality, and other environmental characteristics.

Global climate change is causing biomes to change in many ways. Biomes are shifting towards the poles as temperatures rise, and precipitation patterns are changing. Many species of plants and animals are having difficulty adapting to these changes, which is causing their populations to decline or shift to new areas.

Hence , The global climate change is affecting biomes in many ways, and all types of research have concluded that global climate change is making climates more extreme. Different types of research have all concluded that global climate change is making climates more extreme. The correct option is C.

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When a foreign gene is inserted into an organism, it is referred to as genetic engineering.

Genetic engineering is the method of modifying the genetic material of an organism, either by direct gene transfer or by selective breeding, to obtain desirable traits or to get a better understanding of the organism's genetics. It entails inserting, deleting, or changing genes in an organism's genetic code.The foreign gene is introduced into the organism by a vector. A vector is a carrier that carries genetic material from one organism to another. Plasmids, bacteriophages, and viral vectors are some of the most common vectors used in genetic engineering.

The foreign gene, for example, is isolated from its original organism and then inserted into a vector, which then carries it into the host organism.The new genetic material is then incorporated into the host organism's DNA. If it is carried out in a gamete, it will be inherited by the organism's progeny, resulting in genetic modification or genetic engineering of the species. The introduced gene might come from a different species, a natural variant of the organism, or a totally artificial construct, such as a gene designed to treat a genetic illness. The technique has a variety of uses, including biotechnology, agriculture, and medicine.

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The pulse variability hypothesis states that long-term environmental unpredictability led to morphological and behavioral adaptations.

What is the pulse variability hypothesis? The pulse variability hypothesis is a concept that describes how environmental variability affects life on earth. It states that changes in the natural environment may not always be gradual, but instead may occur in pulses, with periods of stability interrupted by short periods of intense variation.

Pulse variability hypothesis refers to the idea that the natural environment is not always in a state of gradual change but, rather, is subject to punctuated shifts where long-term environmental unpredictability results in morphological and behavioral adaptations.

The hypothesis provides an alternative perspective to the traditionally held view of gradual and constant environmental change.

What is environmental unpredictability? Environmental unpredictability refers to an event in which an ecosystem's climate changes abruptly and unpredictably due to environmental factors. Changes to the environment can lead to shifts in populations and in the composition of entire ecosystems.

This kind of environmental unpredictability is one of the major threats to biodiversity.

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The physical and biological conditions in which all the organisms thrives is called as Ecosystem.

In ecology, an ecosystem is a structural and functional unit where living things interact with one another and their surroundings. An ecosystem, then, is a series of interactions between species and their surroundings. An English botanist named A.G. Tansley first used the word "Ecosystem" in 1935.

The arrangement of both biotic and abiotic elements defines the structure of an ecosystem. This covers how energy is distributed in our surroundings. It also takes into account the climate that prevails in that specific setting.

An ecosystem's structure may be divided into two primary parts, namely:

In an ecosystem, the biotic and abiotic elements are interconnected. It is an open system in which components and energy may move freely across barriers.

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Overall, the evidence suggests that factories can be a significant source of water pollution, and that industrial activity can have a significant impact on water quality.

Pollution refers to the presence or introduction into the environment of substances or other agents that cause harm, discomfort, or damage to living organisms, natural resources, or the environment as a whole. These substances or agents may be physical, chemical, or biological in nature. Pollution can occur in different forms, including air pollution, water pollution, soil pollution, noise pollution, and light pollution. The sources of pollution can be natural, such as volcanic eruptions, wildfires, and dust storms, or human-made, such as industrial activity, transportation, and waste disposal.

Here,

There are several pieces of evidence that suggest that factories can cause water pollution. Here are some examples:

Chemical Discharge: Many factories discharge chemical waste and byproducts into nearby waterways, which can lead to contamination of the water. These chemicals can include heavy metals, solvents, and other toxic substances that can harm aquatic life and make the water unsafe for human use.

Elevated pollutant levels: Studies have found that water near industrial areas often contains higher levels of pollutants, such as heavy metals, than water in non-industrial areas. This suggests that factories are a significant source of water pollution.

Spills and Accidents: Accidents at factories, such as spills or leaks, can release large amounts of pollutants into nearby waterways. This can cause immediate harm to aquatic life and can also lead to long-term contamination of the water.

Industrial waste dumping: Factories may dump their industrial waste directly into nearby waterways, which can lead to water pollution. This can happen when factories are not properly disposing of their waste or when they are cutting corners to save costs.

Decrease in water quality: Monitoring programs for water quality have found that areas around factories tend to have lower water quality than areas farther away from factories. This suggests that factories are a major contributor to water pollution.

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The chronological order is

1) The Brucella organism enters the host through the exposure of the skin and mucosa or by ingestion.

2) The Brucella organism invades the GI tract by migrating through M cells.

3) The Brucella organism is phagocytized by macrophages of the mucosa-associated lymphoid tissue.

4) Once internalized, the organism survives within the phagolysosomes and establishes an intracellular existence.

5) Infected macrophages can then traffic the bacteria to the lymph nodes and other sites within the body.

How Brucella establishes infection within a host? The following are the ways in which Brucella establishes infection within a host: Brucella organism enters the host through the exposure of the skin and mucosa or by ingestion. The Brucella organism invades the GI tract by migrating through M cells.

The Brucella organism is phagocytized by macrophages of the mucosa-associated lymphoid tissue. Once internalized, the organism survives within the phagolysosomes and establishes an intracellular existence. Infected macrophages can then traffic the bacteria to the lymph nodes and other sites within the body.

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Scientists form the geologic time scale by dividing Earth’s history into major and minor eras. This is based on the evidence from the rock layers, fossils, and other data gathered from around the world.

Scientists first divided Earth’s history into the four main eras: Precambrian, Paleozoic, Mesozoic, and Cenozoic. Each of these eras is further divided into smaller and more specific periods, such as the Jurassic period during the Mesozoic era. Each of these periods has its own set of rock layers, fossils, and other evidence that can be studied.  
By examining these features, scientists can build a timeline of Earth's history and map out when certain events occurred, such as mass extinctions or changes in the environment. This is how they have formed the geologic time scale.

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The tibia and the smaller fibula are the two bones that make up the lower leg. The massive upper leg bone that joins the lower leg bones (knee joint) to the pelvic bone is known as the thigh bone, or femur (hip joint).

The larger and more powerful of the two bones is the tibia, sometimes referred to as the shinbone, which is situated on the medial (inside) side of the lower leg. At the knee joint and the ankle joint, the tibia articulates with the femur (thigh bone).

The lateral (outside) side of the lower leg contains the fibula, sometimes referred to as the calf bone. It is a long, thin bone. Compared to the tibia, the fibula carries less weight and primarily serves as a location for muscle attachment. In the ankle joint, the fibula articulates with the tibia at its proximal and distal ends, as well as with the talus and tarsal bones.

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False. Microtubules are thicker than microfilaments.

Microfilaments, also known as actin filaments, are thin and flexible protein filaments that are present in the cytoplasm of eukaryotic cells. Microfilaments are one of the three primary types of cytoskeleton fibers, the other two being intermediate filaments and microtubules.

Microfilaments are approximately 7 nm in diameter, which is around 10 times smaller than microtubules. Microfilaments, like microtubules, are dynamic structures, meaning that they can grow and shrink rapidly depending on the cell's requirements.

Microtubules are hollow, tube-like structures made up of protein subunits called tubulins. They are one of the three main cytoskeleton fibers, along with intermediate filaments and microfilaments.

Microtubules are the thickest of the three types of cytoskeleton fibers, with a diameter of approximately 25 nm. They play a variety of roles in cells, including cell division, maintaining cell shape and structure, and facilitating intracellular transport.

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Chromosomes align in the center of a cell during metaphase, which is the second stage of the cell cycle.

During this stage, the spindle apparatus forms, which is composed of microtubules that attach to each chromosome. The microtubules will then pull the chromosomes to the centre of the cell, aligning them in a process known as the Metaphase Plate. This ensures that each daughter cell will have the same number of chromosomes as the parent cell. The alignment of chromosomes in the center of the cell during metaphase is essential for accurate segregation during the later stages of cell division.
In preparation for metaphase, the chromatids (the two identical halves of a chromosome) that were previously duplicated in the preceding stage, prophase, condense into a tightly-packed structure. Microtubules attach to each chromatid and the spindle apparatus begins to form. Once the spindle apparatus is formed, the chromosomes are pulled to the centre of the cell, resulting in the Metaphase Plate.
The alignment of chromosomes in the centre of the cell during metaphase is essential for the accurate segregation of chromosomes during the following stage, anaphase. During anaphase, the centromeres (the point where two chromatids of a chromosome are joined) of each chromosome separate and the two daughter chromosomes are pulled in opposite directions. This ensures that each daughter cell receives the same genetic information from the parent cell.
In summary, during metaphase, the chromosomes align in the centre of the cell as a result of the spindle apparatus. This alignment is necessary to ensure that each daughter cell receives the same genetic information from the parent cell during the subsequent stages of cell division.

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The orientation/attachment of the microtubules when the muscle is at rest, vs during contraction: In muscle fibers, microtubules are mainly concentrated in the perinuclear region and the subsarcolemmal regions. Microtubules appear to be aligned parallel to the longitudinal axis of the muscle fiber when the muscle is at rest.

Microtubules in muscle fibers are associated with the Z-lines and serve as the foundation for the Z-line and actin filaments. During contraction, however, the orientation of the microtubules changes, with the microtubules being displaced towards the I-band area. This is critical since it contributes to the mechanical coupling of the muscle fiber’s cytoskeleton with the myofibrillar apparatus.

The microtubule network appears to play an important role in this process in skeletal muscle fibers. The microtubules’ change in orientation and attachment during muscle contraction allows for the efficient transfer of mechanical forces generated by myofibrils to the cell membrane and extracellular matrix. As a result, any disruption to the microtubule network may impair the muscle fiber’s overall mechanical stability and possibly lead to muscle dysfunction.

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Mutations are referred to as changes to chromosomes or the nucleotide sequence in DNA. Point mutation occurs when only one base pair is changed, as in the example. A frameshift mutation may result from a change that involves the insertion or deletion of a base pair.

DNA is a dynamic and adaptable molecule. As a result, the nucleotide sequences found therein are subject to change due to a process known as mutation. The effects of a particular mutation on an organism's genetic make-up can be beneficial, harmful, or even harmless.

The insertion or deletion of one or more nucleotides during replication can result in a mutation type called a frameshift mutation. The result of a frameshift mutation is a complete modification of a protein's amino acid sequence.

A point mutation is a type of genetic modification in which the DNA or RNA sequence of an organism only experiences one nucleotide base change, addition, or deletion.

The sentences can be finished as follows: Mutations are changes to chromosomes or the nucleotide sequence in DNA. Point mutation occurs when only one base pair is changed, as in the example. A frameshift mutation may result from a change that involves the insertion or deletion of a base pair.

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The four nitrogenous bases between A purine & pyrimidine are Adenine (A), Guanine (G), Cytosine (C), and Thymine (T).

These bases are found in DNA, which is the genetic material that carries the instructions for the development, function, and reproduction of living organisms.

The nitrogenous bases are related because they pair up to form the rungs of the DNA ladder. Specifically, Adenine (A) always pairs with Thymine (T) and Guanine (G) always pairs with Cytosine (C). This base pairing is essential for DNA replication and protein synthesis.

Adenine (A) and Guanine (G) are purines, which means they have a double-ring structure. Cytosine (C) and Thymine (T), on the other hand, are pyrimidines and have a single-ring structure. The difference in their structures affects how they pair up with each other in the DNA double helix. The pairing of a purine with a pyrimidine allows for the correct spacing between the rungs of the DNA ladder.

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The circuit of the circulatory system in which blood gets oxygenated is known as the pulmonary circuit.

The circulatory system is responsible for transporting blood, oxygen, and nutrients throughout the body. It is composed of the heart, blood vessels, and blood. The heart is responsible for pumping blood through the blood vessels, which distribute oxygen and nutrients to the body's tissues and organs.

The pulmonary circuit is one of two circuits in the circulatory system. The pulmonary circuit is the circuit that transports oxygen-poor blood from the heart to the lungs, where it is oxygenated, and then returns it to the heart.

The oxygenated blood is then pumped by the heart to the rest of the body through the systemic circuit. The systemic circuit is responsible for supplying oxygen-rich blood to the body's tissues and organs.

The oxygen-rich blood is pumped out of the heart by the left ventricle and flows through the aorta to the rest of the body.

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Decreasing the hematocrit would decrease total peripheral resistance to blood flow.

Hematocrit is the proportion of blood that is occupied by red blood cells. A decrease in hematocrit leads to decreased viscosity in blood. This leads to a decrease in the resistance to blood flow that the blood vessels present. Blood flow is restricted due to the resistance offered by the walls of the vessels that the blood flows through. This resistance is called total peripheral resistance (TPR). This is how a decrease in total peripheral resistance is brought about by a decrease in hematocrit. Vasoconstriction refers to the narrowing of blood vessels, and atherosclerosis is a medical condition that leads to the hardening and narrowing of arteries, both of which would increase TPR.

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Exposure to cigarette smoke and genetic susceptibility can result in a higher risk of lung cancer, illustrating a gene-environment interaction.

The interaction between the environmental factor of cigarette smoke and the genetic factor of predisposition for lung cancer results in an increased risk for lung cancer. People who are exposed to cigarette smoke (environmental factor) are more likely to develop lung cancer, but this risk is further increased if they have a genetic predisposition for lung cancer (genetic factor). In other words, the interaction between exposure to cigarette smoke and genetic susceptibility results in a higher risk for lung cancer than either factor alone. This illustrates a gene-environment interaction.

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Neurotransmitters that depolarize the postsynaptic membrane are known as excitatory neurotransmitters.

This means they cause an increase in the neuron's membrane potential, resulting in the neuron firing an action potential.
The action potential can be initiated when an excitatory neurotransmitter binds to the postsynaptic receptor. This binding of the neurotransmitter to the receptor causes an influx of ions into the cell. This influx of ions changes the electrical potential of the membrane, thus depolarizing the membrane and allowing an action potential to be generated.
Some examples of excitatory neurotransmitters are glutamate, acetylcholine, and epinephrine. Glutamate is the most common excitatory neurotransmitter, and it is responsible for the majority of excitatory signals in the brain. Acetylcholine is involved in the transmission of signals from the motor cortex to the skeletal muscles, and it is also involved in the learning and memory process. Finally, epinephrine is a hormone that is released during stress and is involved in the fight-or-flight response.
In summary, excitatory neurotransmitters are neurotransmitters that depolarize the postsynaptic membrane, thus allowing the generation of an action potential. Examples of excitatory neurotransmitters include glutamate, acetylcholine, and epinephrine.

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The reaction cannot proceed without a certain amount of activation energy.

Delta G is negative in an exergonic reaction, so the reactants have more free energy than the products. It's likely that the reactants are more arranged than the products. The reactants can respond unexpectedly in an exergonic response.

The reaction is deemed exergonic if delta G is negative, indicating that it occurs spontaneously. The reaction is considered to be ENDERGONIC and non-spontaneous if delta G is positive.

A nonspontaneous process requires an ongoing supply of energy from an external source, whereas a spontaneous process does not.

Through the interaction of decreasing energy and increasing entropy, it is determined that spontaneous reactions are processes of combustion. The response is random if the Gibbs Free Energy is negative; The reaction is not spontaneous if it's positive.

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