What is the best description of the chromosomes by the end of metaphase of mitosis?


The chromosomes reach opposite sides of the cell and begin to be incorporated into two new nuclei.


The chromosomes have coiled and become more compact.


The chromosomes separate at the centromere and begin to move apart.


The chromosome pairs collect in a line across the middle of the cell.

Answer:

virtual

Explanation:

Answer:

Virtual

Explanation:

I took the test

Answer:

A

Explanation:

Answer: A). Alveoli

Explanation: Alveoli are important part of the respiratory system. They are tiny air sacs located at the end of the bronchioles in the lungs which functions in the exchange of oxygen and carbon dioxide. Alveoli is the plural of alveolus, and they are sites for the exchange of oxygen and carbon dioxide in the lungs. Deoxygenated blood is transported from the heart to the alveoli in the lungs through the pulmonary artery where carbon dioxide is unloaded from the red blood cells and oxygenated is loaded. The blood leaving the lungs becomes oxygenated and are transported to other parts of the body. Alveoli functions in getting oxygen into the blood stream and removing carbon dioxide from the blood stream.

Answer:

glucose and oxygen

Explanation:

Answer:

Round

Explanation:

The Earth is round ,even though there are many contradictions. The Earth spins on an axis, which is why there are different time zones all around the world. If the world was flat, then an Earth's core wouldn't exist and also the laws of gravity would not make since due to the Earth being considered flat. People would never know if they met the end of the Earth, or if they walked off the face of the Earth. Also note that if the Earth was flat then our Solar System would have to be flat since it involves the planets to revolve around the Sun.

Answer:

The Earth is technically an ellipsoid.

Explanation:

While the Earth appears to be round when viewed from the vantage point of space, it is actually closer to an ellipsoid. However, even an ellipsoid does not adequately describe the Earth’s unique and ever-changing shape.("Is the Earth round?") If the Earth were flat, then many of the things we know and love today would be gone. The tides, the moon, the atmosphere, etc.

Answer:

Water, during the light-dependent reactions.

Explanation:

During the light-dependent reactions, a photon (particle of energy) from the Sun strikes the pigment molecules in Photosystem I in the thylakoids of chloroplasts. The pigment molecules pass the energy around until it strikes a pair of electrons located where Chlorophyl A is. One electron is "bounced" to the primary electron acceptor. But now it's gone. What replaces it?

The answer is in water. However, water not only provides replacement electrons; it also provides oxygen. When two oxygen atoms accumulate, they are released as a pair. Thus the answer is water. Hope u found this helpful! :)

Oxygen liberated during photosynthesis comes from the photolysis of water molecules.

The oxygen liberated during photosynthesis comes from water molecules (H2O) during a process called photolysis.

Light-dependent Reactions: Photosynthesis consists of two main stages: the light-dependent reactions and the light-independent reactions (Calvin cycle). The liberation of oxygen occurs during the light-dependent reactions, which take place in the thylakoid membranes of chloroplasts.

Photolysis: In the light-dependent reactions, light energy is absorbed by chlorophyll and other pigments. This energy is used to split water molecules (H2O) into oxygen (O2), protons (H+ ions), and electrons (e^-).

Oxygen Release: The oxygen atoms from the water molecules are released as molecular oxygen (O2) into the atmosphere. This is the oxygen that we breathe, and it is a byproduct of photosynthesis.

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Answer: have a commanding influence on; exercise control over

Explanation: to control or have influence on

Answer:

D. Proportional to

Explanation:

Study island

Answer:

proportional to

Explanation:

An object's weight depends directly on its mass. The greater its mass is, the greater its weight will be. In other words, an object's mass is proportional to its weight.

The chemical that caused the decline of the eagle population is dichloro-diphenyl-trichloroethane

Most biologists now agree that DDT (or dichloro-diphenyl-trichloroethane) contributed to the fall of bald eagle and other bird-of-prey species (such as ospreys and brown pelicans). In agriculture, dichlorodiphenyltrichloroethane, or DDT, is an insecticide. In 1972, the United States outlawed the use of DDT. DDT is still used in several non-US nations to control malaria-transmitting mosquitoes.

The first action taken by the new EPA was to outlaw DDT because of worries about potential health risks to humans as well as environmental damage. Additionally, data connected DDT to dramatic drops in bald eagle populations as a result of thinner eggshells.

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Answer:

how can we know the substance if u didn't attach any diagram to this question

Final answer:

The interaction of substances A and B in chemistry typically refers to a combination reaction where they form a single product, C. This process can include intermediate steps and is influenced by thermodynamic factors such as solubility, temperature, pressure, and concentration.

Explanation:

The interaction of substances A and B could be exemplified in various scenarios within chemistry. Combination reactions occur when two or more reactants interact to form a single substance, such as A and B forming C. In another context, A and B could represent molecules such as an enzyme and its substrate or a ligand and receptor, which bind together to form a specific product. Sometimes, these reactions involve intermediate steps or may involve competing pathways, where a reactant like A could react with B or C resulting in different products.

It is also important to consider thermodynamic factors when mixing substances like A and B that aren't very soluble in each other. Their solubility or lack thereof can influence the direction and extent of their chemical interaction. Factors like temperature, pressure, and concentration, as pointed out in the various examples provided, play critical roles in determining the rates and outcomes of the reactions.

Answer:

The dispersal of plant species occurs when the seeds of the plants are dispersed over different areas by animal means, wind, insects etc.

If the population of the organisms which help in the dispersal of the seed declines, then the dispersal of the plant species will also decline.

Hence, animals and insects are very important for the dispersal of seeds of plants over a region.

Answer:

Very true

Explanation:

Final answer:

True, deserts are described as arid due to their low humidity caused by high evaporation that exceeds scant precipitation. Deserts experience less than 25 centimeters of annual rainfall, leading to dry conditions with high potential evapotranspiration and a low moisture index.

Explanation:

The statement that the humidity of a desert is most likely described as arid is true. Deserts are characterized by a climate where evaporation typically exceeds precipitation, resulting in very low humidity. Deserts are dry areas where the annual rainfall is less than 25 centimeters (10 inches) per year, and often the precipitation is variable and seasonal. In particular, tropical deserts are the driest places, due to the influence of subtropical high pressure and continentality, with humidity levels that can drop to 10% or less.

Regarding the question about potential evapotranspiration and moisture index in deserts, the correct answer is B. high; low. Deserts generally have high potential evapotranspiration because the hot temperatures contribute to rapid evaporation and transpiration. However, the moisture index is low due to the extremely scant rainfall that deserts receive.

Answer:

Explanation:

Mendel believed that all units of inheritance are passed on to offspring unchanged. Unstable alleles are an important exception to this rule. The phenotype of an individual is not only the result of inheriting a particular set of parental genes.

Answer:

Mendel believed that all units of inheritance are passed on to offspring unchanged. Unstable alleles are an important exception to this rule. The phenotype of an individual is not only the result of inheriting a particular set of parental genes.

Explanation:

Answer:

The structures that helps the plant ensure that it’s pollen is moved to other plants of the same species and that sexual reproduction will happen is the bright colored petals and sterility of carpel.

Bright colors of petals attracts the insects like bees, which helps the plant to transfer its pollen to other flower of the same species. In some plants, pollen matures earlier than its own stigma so the pollen transfer to other flowers.

Answer: C: A chain of amino acids

Explanation:

The statement which best describes a protein is that it's a chain of amino acids.

In Science, a protein can be defined as a hydrophilic, macromolecule (polymer) which is typically formed due to the union of a chain of amino acids.

This ultimately implies that, the statement which best describes a protein is that it's a chain of amino acids, and it consist of the following chemical compounds:

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In terms of biodiversity, islands are special locations that contain a range of creatures and ecosystems for both native and endangered biodiversity. Endemism is typical of many islands. Thus islands are regarded as hot spots for biodiversity from a regional biodiversity viewpoint. In a collective portion of a basic land ecosystem it is much simpler to conserve species diversity than by shielding only one region of an archipelago.

Since every island has a specific variety of plants and animals, it is important that conservationists preserve the entire island chain. Thus allow the sources of food to differ from island to island in an archipelago. The type of producer originated in an island and then the type of consumers consuming it differ from island to island due to huge variety of and different adaptations of organisms.

Three types of technology that human can use and its pros and cons is listed below

Explanation:

The Types of Technology

The pros and cons of technology

Pros

1.Improves efficiency for Business

The best advantage of any technology is that it increases the efficiency of a business process. We can perform more tasks in less time. From shared drives to emails, communication, coordination, execution and implementation of a lot of business processes has become swift and hassle-free, all thanks to technology.

2.Saves time

it saves time as we are able to complete a task in lesser time, we can utilize the time saved for other important activities. With the help of technology activities such as cooking, cleaning, working, commuting can be done  faster.

3.Better communication

In earlier times, communicating with a person belonging to a different part of the world was difficult. Think about it! Think back to the time when people had to communicate using pigeons or letters, something that took days or weeks! However today the world has come closer and one can easily connect with a person sitting in another corner of the world, all due to technology.

4.Reduces cybercrime risks

The biggest benefit of technology is to the cyber world. AI (Artificial intelligence) algorithms are qualified to detect a change in patterns that are unique from the normal pattern. Implementing AI to detect cyber-attack is still at an early stage, but with advancement in technology, one can expect to prevent it. Hence the chances of getting a cyber-attack are reduced.  

Cons

There are also some disadvantages of technological advancements:  

1.Extreme dependability

With each passing day, we are becoming more and more dependent on technology for almost every task without even realizing it. A common example of this is using a cab service. Another example is using GPS to know the directions of any desired location.

2.Expensive

Although technology is already a part of many people’s lives, there are still some people out there who cannot afford some technologies. Many technologies that are being used by the organizations are expensive.

3.Shortage of jobs

With technology, the efficiency of a task has increased tenfold and this is the reason why the technology might be able to replace humans soon. An increase in technology is going to ensure that tasks that humans could do earlier can now be achieved by machines and technology. Thus, creating a shortage of jobs.

4.Malfunctions

The biggest disadvantage of technology is that all are machine driven. And a minor lapse in the functioning can create a situation that cannot be controlled. So, a minor malfunction may cause a complete failure which can cost a human life as well.

Answer:

Always cover the microscope with the supplied dust cover when not in use.

Store in a dry place.

In humid or moist environments, it is advisable to store the microscope in a waterproof container with a drying agent.

Do not touch the optical lens with bare fingers.

Do not store the microscope in direct sunlight.

Explanation:

Final answer:

A microscope should be stored properly when not in use to ensure its longevity and prevent damage. Follow these steps: switch off the microscope, clean the lenses, wrap the cord and cover it, and store it in a safe place.

Explanation:

When not in use, a microscope should be stored properly to ensure its longevity and prevent damage. Here are the steps to follow:

Answer:

c

Explanation:

there can't be growth if there are not enough resources

Answer:

C. When there is no competition.

& (If you have different options)

When there are unlimited resources.

Explanation:

correct for those option in the biology ap ex quiz/test as of late May 2021

Answer:

inhereted traits, theyre used during sexual selection

Explanation:

The traits are passed to offspring that help an organism attract a mate. This is considered as inheritance or intimate selection.

The passing on of characteristics or knowledge from one generation of people or cells to the next is known as inheritance.

Genetic inheritance or epigenetic inheritance are the two main general processes through which inheritance can happen.

The name "DNA" refers to deoxyribonucleic acid. The genetic makeup is in charge of information storage. A nitrogen base, a sugar, and a phosphate backbone make up DNA.

It is known as inheritance when this genetic data is handed from a parent to a child, and therefore from one generation to the next.

In the process of intimate selection, members of one biological gender choose partners from the other gender and compete with one another for access to partners from the other gender.

Thus, the answer is intimate selection.

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Answer:

Atoms are the building blocks of elements which means elements made up from large number of atoms having similar size and shape. Compound is made of more than one element which combines in a fixed ratio. The elements inside the compound makes bond with each other. Molecules is also made up of more than one elements. The main difference between molecule and compound is that molecules is formed from same elements while compound is formed from different types of elements.

Answer:pH and poh

Explanation:

Final answer:

The pH scale measures acidity and alkalinity, ranging from 0 to 14, with neutral at 7. It's crucial for understanding enzymatic activity, as changes in pH can alter enzyme function or cause denaturation.

Explanation:

The scale that measures the acidity and alkalinity of a solution is known as the pH scale. This scale ranges from 0 to 14, with values below 7 indicating an acidic solution, values above 7 indicating a basic or alkaline solution, and a value of 7 indicating a neutral solution, like pure water. The pH scale is a critical tool in biochemistry as it helps understand how enzymatic activity can be influenced by the chemical environment, particularly by the concentration of hydrogen ions (H+). A change in pH can affect the ionization of amino acid side groups within the enzyme and its substrate, which can significantly alter the enzyme's function or even result in denaturation, which means the enzyme loses its structure and, consequently, its activity.

Answer:

Chloroplasts reside in most leaf cells. Both chloroplasts and the leaves themselves are different shades of green due to a lovely pigment they contain. A pigment is a compound that absorbs a particular wavelength of visible light. Chlorophyll is a green pigment contained in thylakoid membranes of chloroplasts that is used in photosynthesis by plants. In bacteria that also perform photosynthesis, chlorophylls are in the plasma membrane.

So you might be wondering, how does a pigment absorb light to fuel photosynthesis? First, we need to talk about light itself. The electromagnetic spectrum is the range of wavelengths from the radio waves of your car stereo to high-energy gamma rays. Chlorophyll and other pigments absorb specific visible wavelengths of the electromagnetic spectrum.  

The visible light is literally the colored wavelengths that are visible to your eyes. They range from red, at a wavelength of 700 nm, to blue, at a wavelength of 400 nm. Shorter wavelengths have higher energy (such as blue), and longer wavelengths (like red) have lower energy.  

Chlorophyll mostly absorbs blue and red wavelengths from sunlight. Therefore, it reflects the middle part of this visible spectrum, the green wavelengths.    

This is why plants look green to us. The color of a pigment is the wavelength of light that is reflected, or the wavelength that is not absorbed.

Chlorophyll contains electrons that are normally at a low energy state, or ground state. But when chlorophyll absorbs light energy, the electrons get really excited. Literally! They jump to a high energy level, or excited state. Although we'll save the details of this process for other lessons, this super-excited electron is then transferred from the chlorophyll pigment to a primary electron acceptor. Hence, chlorophyll becomes oxidized.  

Photosynthesis can use both chlorophyll pigments and other accessory pigments that reflect colors other than green. These accessory pigments aren't exactly the jewelry-type accessories of photosynthesis, but they are as helpful as the right pair of shoes to complete an outfit. These accessory pigments absorb other wavelengths of light and pass on energy to chlorophyll, expanding the range of wavelengths that can be used for photosynthesis.

Answer:

The animals that eat the primary consumers. They are heterotrophs, specifically carnivores and omnivores.

Answer:

the cycle of night and day

hope this helps :p

Explanation:

Answer:

it is d

Explanation:

beacuse the earth is rotating on its axis so the face that's toward the sun is day because its closer to the sun

Answer:

Solar energy is converted to chemical energy in the chemical bonds of the glucose molecule.

Explanation:

Answer:

I believe its gene manipulation and overpopulation

Explanation:

Answer:

Both mitochondria and chloroplasts have a circular DNA genome, like a bacteria's genome, but smaller.

Explanation:

The theory of endosymbiosis explains how eukaryotic cells might have risen from prokaryotic cells.

The evidence which supports this theory was the fact the organelles like mitochondria and chloroplast have their own DNA, which is like the prokaryotic DNA. It is circular and smaller. This DNA is also capable of making its own RNA.

This evidence supports the theory of endosymbiosis.

Answer:

There are 3 correct answers for USATestPrep

Mitochondrial DNA is most closely related to a parasitic bacteria called Rickettsia prowazekii, which causes epidemic typhus.

Both mitochondria and chloroplasts have a circular DNA genome, like a bacteria's genome, but much smaller. This DNA is passed from a mitochondrion to its offspring and is separate from the "host" cell's genome in the nucleus.

Both mitochondria and chloroplasts have their own ribosomes to produce proteins.

Explanation:

I did the usatestprep

The endocrine system regulates the excretory system by signaling when blood is out of balance, which causes the kidneys to adjust urine concentration to maintain homeostasis.

The endocrine system affects the excretory system by regulating the balance of water, salts, and other substances in the blood. When blood sugar levels are high, the pancreas, an endocrine gland, secretes insulin, which assists cells in absorbing glucose from the blood, demonstrating the role of hormones in the regulation of bodily functions.

The answer to the question, 'How does the endocrine system affect the excretory system?' is option C: It tells the excretory system when the blood is out of balance. The kidneys, part of the excretory system, adjust the concentration of urine based on signals such as antidiuretic hormone from the endocrine system to maintain homeostasis.

The endocrine system affects the excretory system by signaling when the blood is out of balance. The correct answer is: C. It tells the excretory system when the blood is out of balance.

The endocrine system communicates with the excretory system through hormones, signaling when adjustments are needed in fluid balance, electrolyte levels, and blood pressure.

Hormones like aldosterone regulate sodium and potassium levels in the blood, impacting kidney function and water retention. Similarly, antidiuretic hormone (ADH) controls water reabsorption in the kidneys to regulate blood volume and osmolarity.

If blood pressure drops or electrolyte levels become imbalanced, the endocrine system signals the excretory system to adjust accordingly, such as by increasing or decreasing urine production.

The endocrine system plays a crucial role in maintaining homeostasis within the body, communicating with the excretory system to regulate fluid and electrolyte balance. This ensures proper functioning of the body's internal environment and overall health.