An onion cell measures 0.1 mm in length. If it is 80 mm across in a photograph taken through a microscope, what magnification was used?

Some molecules are too large to pass through the cell membrane without the assistance of a protein channel. The process of molecules traveling along their concentration gradient through protein channels is called facilitated diffusion.

The process of spontaneous passive movement of molecules or ions across a biological membrane by particular transmembrane integral proteins is known as facilitated diffusion.

A form of passive transport is facilitated transport. In contrast to simple diffusion, where substances flow across a membrane without the aid of membrane proteins, substances diffuse across the plasma membrane with the aid of membrane proteins in assisted transport, also known as facilitated diffusion.

Facilitated diffusion is significant because it controls what enters and exits the cell. The cellular component that controls the selective transport of chemicals is the plasma membrane. Facilitated diffusion is illustrated by the movement of amino acids and glucose into cells from the circulation. These molecules are ingested through active transport in the small intestine and then released into circulation.

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Answer: cell a is a skeletal or cardiac muscle.

Explanation:

Answer:

i think the anwser is B or C

Explanation: since a and d are both  vitamins  therefore there incorrect you dont need just both of them to main growth unless you want to earn muscles  but with a lot of vitamins you can maintain growth in many different ways i hope im correct

Answer:

1. Hereditary is

A. the passing of acquired traits from parents to offspring

2. Recessive traits are

C. traits that are hidden by other traits

Antibody-mediated immunity is also referred to as humoral immunity that is involved in the production of antibodies from plasma. The B cells will be the plasma cells with the aid of helper T cells. It will thereby produce antibodies that will fight a specific antigen.

Cell-mediated immunity involves the destruction of cells that are infected by T-cells. It releases cytokines to fight an antigen. Cytokines are made by lymphocytes.

Non-specific defense mechanisms are the skin, mucous membranes and other defense mechanisms.

Answer:

A. involves the production of antibodies from plasma cells

B. involves activation of specific lymphocytes to combat a particular foreign substance.

Answer:

For natural selection to occur, it is true that there must be genetic variation in the population.

Explanation:

According to evolution, natural selection implies the changes that occur in the genotype of a species, due to the effect of environmental factors, and which guarantee its survival through adaptive evolution.

For natural selection to occur, three fundamental conditions must exist:

A trait that can be inherited from one generation to another.

The trait is subject to variability between subjects of the same species.

Genetic variability can determine the possibility of reproductive success and survival.

Therefore, a necessary factor for natural selection to occur is that genetic variability exists in the population.

For natural selection to occur :-

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Answer:

Like the nervous system, the endocrine system is a regulatory system. However, instead of using electrical impulses for signaling, it produces and uses chemical signals called hormones, which travel through the bloodstream and control the actions of cells and organs.

Explanation:

Hope it helps

Answer:

The connection between nutrients and the digestive system is that the digestive system is responsible for breaking down food into smaller molecules called nutrients. These nutrients are then absorbed by the body to provide nutrients necessary for proper functioning. The digestive system works by breaking down proteins into amino acids, carbohydrates into glucose, and fats into fatty acids and glycerol. Once the nutrients are absorbed, they are transported throughout the body to help sustain life.

The effects of alcohol are high blood pressure, heart disease, stroke, liver disease, and digestive problems.

High blood pressure, heart disease, stroke, liver disease, and digestive problems are the effects of alcohol. Cancer of the breast, mouth, throat, esophagus, voice box, liver, colon, and rectum also occur due to more consumption of alcohol. Weakening of the immune system, increasing the chances of getting sick, Learning and memory problems, dementia and poor school performance also the cause of alcohol.

So we can conclude that the effects of alcohol are high blood pressure, heart disease, stroke, liver disease, and digestive problems.

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Answer:

basic

Explanation:

ph value 9 base is ph value is 9and 20

Answer:

B decayed leaves

Explanation:

because mainly the bio fertilizers are decayed leaves and vegetable matter that are used for providing the nutrients and minerals to soil

Answer: the 1st one

Explanation:

A grassland predator and prey, such as a cheetah and a zebra. Therefore correct option is (A).

The pair of organisms that is most likely to have adaptations in common is a pair of organisms that share similar environmental pressures or ecological niches. Organisms that occupy similar habitats, have similar diets, or face similar challenges are more likely to evolve similar adaptations over time.

For example, predatory animals such as lions, tigers, and leopards have evolved similar adaptations such as sharp claws, powerful jaws, and keen senses to help them catch prey. Similarly, desert-dwelling animals such as camels, kangaroo rats, and fennec foxes have adaptations such as the ability to conserve water, tolerate heat, and dig burrows in sandy soil to survive in their arid environments.

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Answer:

A scientific theory can come from observations, experiments, and evidence gathered through research. It is a well-substantiated explanation of some aspect of the natural world based on empirical evidence and has been repeatedly tested and confirmed through observations and experiments. The scientific method is typically used to develop and test scientific theories. It involves making observations, asking questions, formulating hypotheses, testing them through experiments, and analyzing the results to conclude.

Explanation:

A scientific theory can come from observations, experiments, and data analysis. It is based on a body of evidence and has predictive power.

A scientific theory can come from observations, experiments, and data analysis. It is a well-substantiated explanation of some aspect of the natural world that is based on a body of evidence. Theories in science are supported by empirical evidence and have predictive power.

For example, the theory of evolution in biology is supported by evidence from the fossil record, genetics, comparative anatomy, and other fields. It explains the diversity of life on Earth and makes predictions about the relationships between different species.

In physics, the theory of relativity explains the relationship between space, time, and gravity. It has been tested through experiments and observations, demonstrating its accuracy.

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Answer:

To keep blood safe, blood banks carefully screen donated blood. The risk of catching a virus from a blood transfusion is low. Sometimes it is possible to have a transfusion of your own blood. During surgery, you may need a blood transfusion because of blood loss.

hope this helps!!:)

Explanation:

Answer:

1. Muscle: soft, contractile tissue important to produce force and motion in animals.

2. Fascicle: multiple bundles of skeletal muscle fibres which is surrounded by a type of connective tissue called perimysium.

3. Muscle fibres: bundles of cylindrical organelles myofibrils formed by the fusion of myoblasts via myogenesis process.

4. Myo-fibril: basic unit of a muscle cell made of thick and thin myofilament arranged in parallel columns along the length of muscle fibres.

5. Myo-filament: strands of actin and myosin proteins which pack a muscle fiber and are force generating structures.

Explanation:

Answer:

1. Muscle: soft, contractile tissue important to produce force and motion in animals.

2. Fascicle: multiple bundles of skeletal muscle fibres which is surrounded by a type of connective tissue called perimysium.

3. Muscle fibres: bundles of cylindrical organelles myofibrils formed by the fusion of myoblasts via myogenesis process.

4. Myo-fibril: basic unit of a muscle cell made of thick and thin myofilament arranged in parallel columns along the length of muscle fibres.

5. Myo-filament: strands of actin and myosin proteins which pack a muscle fiber and are force generating structures.

Explanation:

i hope this helps :)

Answer:

It can take place in many areas. Three being the skin, hair and liver.

Explanation:

Answer:

skin tissues, hair and liver

Explanation:

Answer:

B. Sun.

Explanation:

The carbon cycle can be defined as the cycle in which carbon atoms travel from the atmosphere to earth and back to the atmosphere. As carbon is the source through which all life on earth exists.

The source of the carbon cycle is solar energy. During the process of photosynthesis, it is the sun that plays an integral role in taking carbon dioxide from plants.

Therefore, option B is the correct answer.

Answer:

dont all ducks have 2 legs?

If gene is not expressed: B.) A protein is not synthesized.  If a gene is not expressed, its mRNA is not synthesized and thus, the corresponding protein is not produced.

A gene is expressed when its DNA sequence is used as a template to synthesize a functional molecule called messenger RNA (mRNA). The mRNA is then transported out of the nucleus and into the cytoplasm, where it serves as a template for the synthesis of a protein.

The lack of expression of a gene can have significant consequences for cellular function and overall organismal health, as proteins play important roles in many biological processes.

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The lysogenic cycle involves the spread of viral DNA when prokaryotic microorganisms reproduce and the lytic cycle destroys the host cell immediately.

The lytic cycle is a type of reproductive cycle in viruses that involve the destruction of the host cells.

Conversely, the lysogenic cycle occurs only in prokaryotic cells and it does not involve the destruction of these cells.

In conclusion, the lysogenic cycle uses prokaryotic reproduction and the lytic cycle destroys the host cell.

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Answer: I think the first one is d and the second is a

Explanation:

Answer:

The fruit grown locally

Answer:

Changes at the nucleotide level go on to influence the translation from gene to protein expression.  Changing even just one nitrogen base in a sequence can alter the amino acid that is expressed by that DNA codon, which can lead to a completely different protein being expressed.  PLEASE CORRECT ME IF I AM WRONG

Explanation:

A change in the DNA sequence affects the amino acid produced during translation because it modifies the codons that will be used in this process.

In conclusion, a change in the DNA sequence affects the amino acid produced during translation because it modifies the codons that will be used in this process.

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The human body contains trillions of cells, 78 different organs, and more than 60,000 miles of blood vessels if you stretched them end-to-end. Incredibly, all of these cells, vessels, and organs work together to keep you alive.

Each organ belongs to one of ten human body systems. These body systems are interconnected and dependent upon one another to function. Your heart does not beat unless your brain and nervous system tell it to do so. Your skeletal system relies on the nutrients it gains from your digestive system to build strong, healthy bones.

A body system is a group of parts that work together to serve a common purpose. Your cardiovascular system works to circulate your blood while your respiratory system introduces oxygen into your body.

Each individual body system works in conjunction with other body systems. The circulatory system is a good example of how body systems interact with each other. Your heart pumps blood through a complex network of blood vessels. When your blood circulates through your digestive system, for example, it picks up nutrients your body absorbed from your last meal. Your blood also carries oxygen inhaled by the lungs. Your circulatory system delivers oxygen and nutrients to the other cells of your body then picks up any waste products created by these cells, including carbon dioxide, and delivers these waste products to the kidneys and lungs for disposal. Meanwhile, the circulatory system carries hormones from the endocrine system and the immune system’s white blood cells that fight off infection.

Each of your body systems relies on the others to work well. Your respiratory system relies on your circulatory system to deliver the oxygen it gathers, while the muscles of your heart cannot function without the oxygen they receive from your lungs. The bones of your skull and spine protect your brain and spinal cord, but your brain regulates the position of your bones by controlling your muscles. The circulatory system provides your brain with a constant supply of oxygen-rich blood while your brain regulates your heart rate and blood pressure.

Even seemingly unrelated body systems are connected. Your skeletal system relies on your urinary system to remove waste produced by bone cells; in return, the bones of your skeleton create a structure that protects your bladder and other urinary system organs. Your circulatory system delivers oxygen-rich blood to your bones. Meanwhile, your bones are busy making new blood cells.

Working together, these systems maintain internal stability and balance, otherwise known as homeostasis. Disease in one body system can disrupt homeostasis and cause trouble in other body systems. If you become ill with the AIDS virus that affects your immune system, for example, you may develop pneumonia in your respiratory system, a yeast infection in your reproductive system, Candida that affects your esophagus in your digestive system, or the skin cancer known as Kaposi’s sarcoma.

Answer:

Dr. Potts used environmental data to support environmental hypotheses capable of explaining human evolution  

Explanation:

In this paper, the author stated that environmental factors have been fundamental for the emergence of adaptive traits during human evolution. In consequence, Dr. Potts explained how particular environmental factors and habitats might have shaped human evolution. For example, it has been hypothesized that dry savanna vegetation might have been a key environmental factor associated to the emergence of human traits including, among others, bipedality, making of tools from stones, the development of human brains, etc. In order to prove this hypothesis, the author recorded environmental data from different regions in Africa (Olorgesailie, Olduvai, Turkana, Zhoukoudian, etc), where it is believed that first hominids evolved about 6-8 million years ago.

ITS NOT B AND ITS NOT C

SOOO EITHER D OR A

Explanation

Answer:

The correct answer is Thermosphere.

Explanation:

I had the same question before and this was the correct answer.

Answer:

Hi how are you doing today Jasmine

Answer:

Yes, an animal can adapt into a new species through a process called speciation. Speciation occurs when a population of animals undergoes significant changes over time, leading to the formation of a new species that is different from the original one.

Explanation:

The main reason for this adaptation and the emergence of a new species is natural selection. Natural selection is the process by which individuals with advantageous traits are more likely to survive and reproduce, passing on those traits to their offspring. Over many generations, these advantageous traits become more common in the population, while individuals without these traits become less common.

When a population of animals faces different environmental conditions or habitats, it can create diverse selection pressures. Some individuals may possess traits that allow them to better adapt to these new conditions, giving them a higher chance of survival and reproduction. As these advantageous traits become more prevalent in the population, they can eventually lead to reproductive isolation.

Reproductive isolation occurs when individuals from the original population can no longer mate and produce fertile offspring with individuals from the newly adapted population. This can happen due to genetic differences and changes that have accumulated over time. When reproductive isolation is complete, the two populations are considered separate species.

Overall, the process of adaptation and the formation of new species is driven by natural selection, which favors traits that enhance an organism's chances of survival and reproduction in specific environments. Over time, these changes can accumulate, leading to the development of distinct species.

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