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What is the main function of cheek cells?

These cells can be found multiple places around the body outside of the cheek, including various cavities and structure surfaces. Cheek cells are considered squamous epithelium cells, which look like thin flat plates that fit closely together. These cells fit so closely together that there is virtually no space between them and almost no intercellular space as well. This creates a flat smooth surface that has low friction capabilities. This lack of friction allows fluids to move easily across the surface of that the cells coat.Since cheek cells are so easy to access, they are often used for DN..

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What are the symptoms of rabies in raccoons?

Animal experts identify several telltale symptoms affecting raccoons with both types of rabies. Unfortunately, symptoms suggesting dumb rabies mirror those of other illnesses, including lead poisoning and distemper, making an immediate diagnosis difficult. More often, raccoons develop furious rabies. In contrast to dumb rabies, furious rabies produces aggressive behavior and agitation. Animals with furious rabies suffer from hallucinations, and they might stare and bark at ordinary objects or bite the air.Regardless of the type of rabies they carry, rabid raccoons pose dangers to humans and an..

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Does a cheek cell have a nucleus?

When viewed under a light microscope, students will see the cell membrane and nucleus after the cheek cell is stained with methylene blue. However, organelle found in the cytoplasm like the mitochondria or lysosomes are not visible because the microscope is not powerful enough. A cheek cell is about 35 micrometers in size, while the nucleus is 4 micrometers. Cheek cells are made up of squamous epithelial cells and will be scale-like in appearance when studied with a microscope.

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What is the reaction between lithium and water?

The reaction of lithium with water to produce a metal hydroxide and hydrogen is called hydrolysis. All elements of group 1A undergo hydrolysis when placed in water because of their high electropositivity. The electrons of the outer shells of this group are weakly attracted to the nucleus, being shielded from nuclear charge by the inner shells of electrons. These outer electrons are readily ejected from the atom in chemical reactions, producing a positive ion having the same electronic configuration as the nearest noble gas.\nWhen exposed to water, surface atoms of lithium shed their outer elec..

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Why do people instinctively curl over their abdominal area in times of danger?

The fetal position is said to be a product of human evolution. People assume this position in times of distress because it reminds the body of the safest, most comfortable period of its existence: the time it spent gestating in the womb. It serves many practical purposes, such as protecting the head and the heart and minimizing danger to the body by keeping it as unexposed as possible.

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How does the Earth move?

The Earth is always rotating from the west towards the east and takes 24 hours to complete its rotation. Revolution of the Earth around the sun takes 365 days or one year. All other celestial objects, including the sun and moon, are also in constant motion.

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What makes onion roots ideal for studying mitosis?

The chromosomes in onion roots also stain dark, which makes them easy to see using light compound microscope. The observation of mitosis using onion roots is done in biology classes as a means demonstrating the stages of cell division. Apart from onion roots, ginger roots are also used.\nThe part of the roots that is placed on a microscopic slide is usually taken from the tips called the apical meristems. The onion root tips are where the growth and cell division of plants take place at a very fast rate, so the chance of being able to observe cells in all the five stages of cell division will ..

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What are the benefits of gamma rays?

Gamma rays are also used in PET scans and bone scans to detect malignancies. Medical personnel use an isotope of cobalt called cobalt 60 as a source of these gamma rays. Gamma rays are also used in autoclaves to sterilize medical instruments.\nThese high-energy rays are also used in the food industry to irradiate food. Irradiation kills bacteria and pathogens and keeps fruit and vegetables fresher longer by interrupting the ripening or sprouting process.\nGamma rays are also used to inspect castings for cracks and imperfections that can't be seen with the human eye. The jewelry industry a..

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How does glycerin strengthen bubbles?

Bubbles are made of a very thin layer of fluid that forms a sphere around a pocket of air. A bubble made from pure liquid, such as water, is not very stable and will be hard to form. Adding soap or glycerin allows the bubble to become more stable and last longer. Glycerin is thick, clear and odorless, which helps the sphere of the bubble to be thicker.

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Does Mars have seasons?

Just like Earth, Mars experiences four seasons – winter, spring, summer and fall – but the annual cycle of seasons takes 1.88 Earth years. The longest season on Mars, according to Universe Today, is the northern hemisphere's spring. This occurs when Mars' northern hemisphere is inclined toward the sun and the planet is about midway between the closest and farthest points in its orbit. This season lasts seven months. The shortest season on Mars is the northern hemisphere's winter, which lasts approximately four months.

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