Before mitosis begins, what happens during S-phase?

A) the sister chromosomes separates

B)cytoplasm separates

C)homologous chromosomes cross over

D) DNA replicates

Explanation:

The compound is found to be composed of 75% carbon and 25% hydrogen.

100 g of the compound contains 75 g of carbon and 25 g of hydrogen.

The atomic masses of carbon and hydrogen are 12 g/mol and 1 g/mol respectively.

The number of moles of C =

12 g/mol

75 g

= 6.25 moles

The number of moles of H =

1 g/mol

25 g

= 25 moles

The mole ratio C:H=6.25:25=1:4

The empirical formula of the compound is CH

4

.

The chart displays the population sizes of three African animals in 1990 and 2000. In 1990, the lion population was estimated to be 100,000, while in 2000 it decreased to 47,000. This indicates a decline in the lion population over the span of ten years.

Similarly, the cheetah population declined from 50,000 in 1990 to 7,500 in 2000. This shows a significant decrease in the cheetah population during this period.The zebra population also experienced a decline, decreasing from 15,000 in 1990 to 2,500 in 2000. This highlights a substantial decrease in the zebra population over the ten-year period.

In conclusion, the chart illustrates a decline in the population sizes of lions, cheetahs, and zebras in Africa from 1990 to 2000.The chart displays the population sizes of three African animals, specifically lions, cheetahs, and zebras, in the years 1990 and 2000. Starting with the lion population, it was estimated to be 100,000 in 1990, but this number significantly decreased to 47,000 in 2000.

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The number of particles able to undergo a chemical reaction is less than the number that is not able to. Therefore, the correct option is option C.

Both kinetic and potential energy are present in particles. Particles in a system primarily have two forms of energy. Particle motion is made possible by kinetic energy. The energy that maintains the locations of the particles is known as potential energy.

Total KE and PE constitute internal energy. If you add up all of the kinetic and potential energy in the system, you can calculate the internal energy. The number of particles able to undergo a chemical reaction is less than the number that is not able to.

Therefore, the correct option is option C.

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Your question is incomplete but most probably your full question was,

The graph shows the distribution of energy in the particles of two gas samples at different temperatures, T1 and T2. A, B, and C represent individual particles. Based on the graph, which of the following statements is likely to be true? (3 points)

answer choices

Particle A is more likely to participate in the reaction than particle B.

Particle C is more likely to participate in the reaction than particle B.

The number of particles able to undergo a chemical reaction is less than the number that is not able to.

More gas particles participate in the reaction at T2 than at T1.

Phagocytosis is a lot more efficient than the feeding process used by bacteria because phagocytes allows the cells to absorb all the nutrient which carries by the organism that has been phagocytosed.

In feeding the extracellular process such as bacteria use most of the nutrients  which cannot be absorbed effectively. It is the process by which cells can take into themselves solid matter such as bacteria. This process is done by using the natural flexibility of the cell membrane which fold inward to create a vacuole for any particles intended to  taken in.

Phagocytosis is ingested and destroy pathogens such as viruses and bacteria and infected cells. These cells destroying the infected cells, they quickly the spread and multiply.

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Answer:

Different wavelengths and frequencies but the same speed threw empty space.

Explanation:

Radio waves, television waves, and microwaves are all types of electromagnetic waves. They only differ from each other in wavelength. ... The electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, X-rays, and gamma-rays.

Answer:

Knowledge gained during the early years of human spaceflight indicated an adaptation to the new environment. While the empirical evidence was limited, the biomedical data indicated that microgravity alters the musculoskeletal, cardiovascular, and neurosensory systems.

The technological advantages that allowed seafaring Arabs during the Middle Ages were their retaining ancient and classical European discoveries, military engineering, metallurgy, glassmaking, etc.

Technologies are advancements in old things. These advancements are based on scientific theories and experiments. The products that were in demand were exported by Arabs like spices, stones, metals, silk, etc.

Thus, Arabs could navigate the seas thanks to technological advantages such as preserving classical and ancient European discoveries, military engineering, metallurgy, glassmaking, etc.

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Answer:

50%

Explanation:

CF is a recessive trait.  That means that an individual must have two copies of the recessive allele in their genotype in order to express the trait.  That means that the parent with CF has genotype cc, while the parent who is heterozygous, and does not express the trait, has genotype Cc.  Using a Punnett square to demonstrate the cross of these two parents will produce a probability of 50% heterozygous and 50% positive for CF.

Answer:

c. building dams

Explanation:

Answer:

building sea walls building levees building dams building storm shelters

Enamel is indeed the hardest substance in the human body. It is present in teeth of humans. It covers every tooth and provides the hard layer.

Tooth Enamel is hard glossy substance that is comprised of calcium and phosphate mineral crystals which in return makes our teeth more stronger. Teeth enamel care is extremely important to maintain the oral health of teeth.

Tooth Enamel is one of the major tissue that make up tooth in humans. It covers the top layer of the teeth known as Crown. Calcium hardens the tooth enamel. Enamel contains 96% of the minerals. The color of Enamel varies from light yellow to white.

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Answer: Catalase is a common enzyme, found in nearly all living organisms. It catalyses hydrogen peroxide into water and oxygen and protects organisms from free radicals It also has industrial uses to prevent certain contaminants in food and as a disinfectant for contact lenses and a cleansing agent in some other products.

Explanation:

This wasn't helpful im sorry

Deletion, insertion, and substitution can alter genes in a skin cell, the altered genes will most likely be passed on to the next generation

The process of altering genes can happen due to deletion, insertion, and substitution. When any of these processes occur, it results in changes in the DNA sequence of the gene. The deletion process occurs when a certain nucleotide or a sequence of nucleotides is removed from the DNA strand, while insertion occurs when new nucleotides are added to the DNA sequence. Substitution, on the other hand, is the replacement of one nucleotide with another, and it can cause missense, nonsense, or silent mutations in the DNA sequence.

As a result of any of these processes, there may be alterations in the gene's function, leading to various consequences. The altered genes may then be passed on to the next generation through genetic transmission. This may result in inherited disorders or may have no noticeable effect on the offspring, depending on the type of gene involved. So therefore deletion, insertion, and substitution can alter genes in a skin cell, the altered genes will most likely be passed on to the next generation.

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Answer:

He chose peas because they had been used for similar studies, are easy to grow and can be sown each year.

grass → grasshopper → mouse

Answer:

The trophic system

Explanation:

Because mercury is commonly released into the environment, it accumulates in ocean sediments and eventually enters the food chain. The reason you can eat sardines safely is because the are primary consumers also known as autotrophs or herbivores. Because sardines aren't predatory they never consume mercury in a quantity high enough to even enter the bloodstream. However, tunas are heterotrophs or carnivores (though heterotrophs can still be omnivorous) meaning that they often consume other primary consumers with high amounts of mercury in their bloodstreams as well.

Explanation:

blood contains far fewer white blood cells than red blood cells , bud the body can increase the production of white blood cells to fight infection ...

Unfortunately, I am an AI language model and cannot create a physical sticky note for you. However, I can provide an answer to your question about how people have lost their eyesight.

There are various ways in which people can lose their eyesight, leading to different types of visual impairments. Some of the most common causes of blindness or visual impairments include:

1. Age-related macular degeneration: This is a condition that affects the retina and can cause a loss of central vision. It is most provide seen in older adults.

2. Cataracts: This is a clouding of the lens of the eye, which can cause blurred vision or sensitivity to light. It is usually seen in older adults but can also be present at birth or develop due to injury or exposure to radiation.

3. Glaucoma: This is a group of eye diseases that can cause damage to the optic nerve and lead to vision loss. It is often associated with high pressure inside the eye.

4. Diabetic retinopathy: This is a complication of diabetes that affects the blood vessels in the retina and can cause vision loss or blindness.

5. Trauma or injury to the eye: Blunt trauma or penetrating injuries to the eye can cause vision loss or blindness. This can happen due to accidents, sports injuries, or violence.

6. Infections or inflammation: Certain infections such as herpes simplex virus or inflammation of the eye can lead to vision loss or blindness.

There are also many genetic conditions that can cause visual impairments or blindness.

In some cases, people may be born with a visual impairment, while in other cases, it may develop over time due to a degenerative condition or injury. Despite these challenges, many individuals with visual impairments have learned to adapt and lead fulfilling lives with the help of assistive technology and support from their communities.

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The correct option is (d). Active transport of sodium ions is an example of molecular movement across a membrane through active transport.

Active transport of sodium ions is an example of molecular movement across a membrane through active transport. What is active transport? Active transport refers to the movement of molecules from a region of low concentration to a region of high concentration with the aid of an energy supply. It is responsible for transporting molecules into the cell against their concentration gradient and requires energy to do so. Active transport may be used to move different molecules across a membrane, including ions, nutrients, and proteins. Active transport mechanisms, on the other hand, require metabolic energy to function.What is the significance of a membrane?

The cell membrane protects the contents of a cell from the outside world. A thin, protective barrier that surrounds the cell is known as a membrane. It's constructed of phospholipids, proteins, and cholesterol, and it's responsible for a variety of cellular processes, including diffusion. Diffusion can be defined as the movement of molecules from a region of high concentration to a region of low concentration through a selectively permeable membrane. It is one of the most basic mechanisms that drives movement across the cell membrane and is used by a variety of molecules. Diffusion occurs passively and does not require the input of energy from the cell.In conclusion, the correct option that describes an example of molecular movement across a membrane through active transport is option d: Active transport of sodium ions.

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UCA is the region of the mRNA that codes for serine. AGU specifies the amino acid serine, so its complementary base, which is a component of mRNA, will be UCA (option -4) is the answer.

The amino acid serine, for instance, is specified by the codons UCU, UCC, UCA, UCG, AGU, and AGC. The list of codon combinations and the corresponding amino acids can be found in the RNA codon table above.

The four DNA bases, adenine (A), cytosine (C), guanine (G), and thymine (T), are used in different ways by each gene's code to create three-letter "codons" that describe the amino acid that is required at each position in a protein.

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The series of mitochondrial proteins that transfer electron energy to ATP and require oxygen is known as the electron transport chain (ETC).

The ETC is a critical component of cellular respiration and occurs in the inner mitochondrial membrane. It consists of a series of protein complexes, including NADH dehydrogenase, succinate dehydrogenase, cytochrome b-c1 complex, cytochrome c, and cytochrome oxidase. These complexes work together to transfer electrons derived from NADH and FADH2, which are produced during earlier stages of cellular respiration, and transfer them along the chain.

As electrons are passed through the protein complexes, energy is released and used to pump protons across the mitochondrial membrane, creating an electrochemical gradient. This gradient is then used by ATP synthase to produce ATP through a process known as oxidative phosphorylation.

The final acceptor of the electron transport chain is oxygen, which combines with hydrogen ions to form water. Thus, the ETC connects the process of electron transfer to the production of ATP, relying on oxygen as the final electron acceptor.

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The complete question is:

A series of mitochondrial proteins that transfer electron energy to ATP and require oxygen is called ______.

Answer:

Pretty much nothing because atoms are made up of electrons and you are made up of electrons and we are exposed to sunlight. I think.

Explanation:

Linear growth is represented by a straight line on a graph, while exponential growth is represented by a curve that increases increasingly faster over time.

Linear growth is a type of growth in which there is a constant increase in the value over time.

On a graph, linear growth appears as a straight line with a constant slope or gradient.

For example, if a company's revenue increases by $1000 each month, then the graph of its revenue over time would be a straight line with a constant upward slope.

Exponential growth, on the other hand, is a type of growth in which the value increases at an increasing rate over time.

On a graph, exponential growth appears as a curve that becomes steeper and steeper over time.

For example, if a population doubles every year, then the graph of its population over time would start off flat but quickly become a steep curve.

The main difference between linear growth and exponential growth is the rate of increase over time.

In linear growth, the rate of increase remains constant, while in exponential growth, the rate of increase becomes faster and faster as time goes on.

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A gene mutation caused by a change in a single DNA base pair is called a point mutation.

The most frequent kind of gene changes, known as point mutations, can take several different forms. A substitution is a form of point mutation where one nucleotide base is swapped out for another, such example going from adenine (A) to guanine (G). A point mutation that involves the addition or deletion of one or more nucleotides from the DNA sequence is another type of point mutation. Point mutations can develop naturally or can be brought on by the environment, such as exposure to radiation or specific chemicals. Point mutations can have a variety of impacts on an organism, from having no effect to causing disease, depending on where the mutation occurs and how it affects the gene's function.

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HPS provided a holistic approach to studying the energy concept by integrating historical and philosophical perspectives, overcoming fragmented learning.

The history and philosophy of science (HPS) has played a crucial role in minimizing the fragmented learning of the energy concept by providing a holistic approach to its study. Traditionally, the teaching of energy in science classrooms has often focused solely on empirical results and mathematical equations, neglecting the historical and philosophical dimensions that surround the concept.

By incorporating HPS into the study of energy, students gain a deeper understanding of its development over time, the societal and cultural influences that shaped its understanding, and the philosophical underpinnings that guide its use and interpretation. This approach helps students see energy as more than just a mathematical formula or a set of isolated phenomena.

By examining the historical context, students can appreciate the gradual evolution of the energy concept, the controversies and debates that arose, and the scientific advancements that led to our current understanding.

By integrating historical and philosophical perspectives, HPS minimizes the fragmented learning of energy by offering a comprehensive understanding of the concept, enabling students to see its interconnectedness with other scientific ideas and its relevance to broader human knowledge and inquiry.

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The advantage for plants having undigestible seeds is that it allows seeds to reside in the gut until conditions are appropriate for germination.

Fruits are a source of nutrition for animals that consume them, and they are also a means of seed distribution for plants that produce them. Many types of plants generate fruit that is consumed by animals; nevertheless, the seeds of such plants are usually indigestible. As a result, the seeds can be dispersed into new areas by animals that eat the fruit.

However, having undigestible seeds provides a distinct benefit to plants: it allows seeds to reside in the gut until conditions are appropriate for germination, which aids in seed growth and germination.

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Using the equation A = S × V, where A represents the number of Staphylococcus aureus cells present in custard, S denotes the concentration of cells, and V indicates the volume of custard, we can determine the quantity of Staphylococcus aureus cells in the custard.

By incorporating the concept of "i" or the infectivity factor, we can further refine the calculation to account for the ability of the bacteria to replicate and grow. The calculated value of A will provide an estimation of the population of Staphylococcus aureus cells in the custard.

To determine the number of Staphylococcus aureus cells in custard, we use the equation A = S × V, where A represents the number of cells, S is the concentration of cells, and V denotes the volume of custard. The concentration of cells is usually measured as colony-forming units per millilitre (CFU/ml), which indicates the number of viable bacterial cells. By multiplying the concentration (S) by the volume (V) of the custard, we obtain an estimate of the total number of cells (A) in the sample.

However, to account for the growth potential of Staphylococcus aureus, we can introduce the concept of the infectivity factor, denoted as "i". The infectivity factor represents the ability of bacteria to replicate and multiply. By incorporating "i" into the equation, we can refine our estimation of the Staphylococcus aureus population in the custard, considering the growth potential of the bacteria. Therefore, the revised equation becomes A = (S × V) × i.

Using this modified equation, we can calculate the number of Staphylococcus aureus cells present in custard, considering both the initial concentration of cells and their ability to replicate. It is important to note that obtaining accurate values for S (concentration), V (volume), and i (infectivity factor) is crucial for obtaining a reliable estimation of the bacterial population in the custard.

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Answer:the system of nomenclature in which two terms are used to denote a species of living organism, the first one indicating the genus and the second the specific epithet

Explanation: