Cells

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Skin regenerates by filling the gap between the sides of the cut with newly generated skin cells, starting with the dermis (bottom-most layer of the skin) and working its way up. Very shallow cuts are followed by easy regeneration, as only the stratum basale layer (the deepest layer of skin) of the epidermis (the outermost layer of the skin) is needed to generate enough cells to repair the damage.

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  • What is the difference between plant cells vs. animal cells?

    Q: What is the difference between plant cells vs. animal cells?

    A: Plant cells differ from animal cells in three major ways: their components, their function and the structures they build. Plant cells are typically more rigid than animal cells; they do not move, and they are able to synthesize all the chemical compounds needed by the organism. Animal cells must receive at least some of their nutrients from an outside source.
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  • What is the importance of meiosis?

    Q: What is the importance of meiosis?

    A: The importance of meiosis is that it enables genetic diversity. Unlike the asexual form of cellular division, mitosis, meiosis allows chromosome pairs with the same genes, called homologous chromosomes, to exchange pieces in a process called recombination. This enables chromosome pieces from the female parent to combine with those of the male parent.
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  • Why are cells so small?

    Q: Why are cells so small?

    A: Brooklyn College explains that cells are small because they must have a large surface area relative to the amount of volume they contain to function properly. As a sphere grows larger, its volume increases much more rapidly than its surface area does. This presents logistical problems for the cell, as it tries to transport resources and products through a large volume without the resources available via a large surface.
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  • What are the longest cells in the human body?

    Q: What are the longest cells in the human body?

    A: The longest cells in the human body are neurons. Neurons are cells within the nervous system and carry messages throughout the body.
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  • What is the largest cell in the world?

    Q: What is the largest cell in the world?

    A: The largest cell in the world is an ostrich’s egg. Sometimes weighing over 3 pounds, the ostrich’s egg is composed of a single cell, as all other animal eggs are.
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  • How do plant, animal and bacterial cells compare in size?

    Q: How do plant, animal and bacterial cells compare in size?

    A: Plant cells and animal cells are much larger than bacterial cells. On average, animals cells range from 10 to 30 micrometers in length, while plant cells average between 10 and 100 micrometers in length. By comparison, bacterial cells are less than 2 micrometers long.
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  • What are analogies for chloroplasts?

    Q: What are analogies for chloroplasts?

    A: According to Online Digital Education Connection, analogies for chloroplasts are power plants that imitate the function of chloroplasts in a plant cell to utilize solar energy or light in the processing of food for plant cells. Score Science lists solar energy plants as city analogies for chloroplasts.
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  • Why is cellular respiration important?

    Q: Why is cellular respiration important?

    A: Faculty resources from Thomas Nelson Community College explain that cellular respiration is the process by which cells produce adenosine triphosphate, or ATP. ATP is the molecule that carries energy for the cells of an organism, and it functions as a “currency” for the cells in an organism. Cells cannot store ATP; instead, they must produce it continuously or the organism will die.
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  • Why are cells called the basic unit of life?

    Q: Why are cells called the basic unit of life?

    A: Cell are considered the basic unit of life because all life forms are composed of them. Some forms of life are made of one cell; others contain trillions.
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  • Where does meiosis take place?

    Q: Where does meiosis take place?

    A: For humans, meiosis occurs in the reproductive organs of both males and females. Both genders make use of meiosis to produce their respective gametes.
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  • Why is iodine stain used on onion cells?

    Q: Why is iodine stain used on onion cells?

    A: Iodine is often used to stain onion cells before microscopic examination to enhance the visibility of the cells. Many cells, including those of onions and other vegetables, are often transparent. When unstained cells are viewed under a microscope, the light passes directly through the cells’ various structures revealing little to no detail. By contrast, when iodine or other dyes are used, the cell absorbs the dye into its various organelles and structures, which blocks the light and allows the observer’s eye to detect the details of the cell.
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  • What are the three parts of the cell theory?

    Q: What are the three parts of the cell theory?

    A: The three fundamental propositions of classical cell theory are that the cell is the most basic unit of life, all life is made up of cells and cells are formed only by other cells. Each tenet of this theory is important to understanding the way living things function on every level.
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  • Why is RNA important to the cell?

    Q: Why is RNA important to the cell?

    A: RNA is important to cells because it relays information encoded in DNA to tiny organs within the cell, called ribosomes, which produce protein according to the RNA's instructions. RNA is thus vital to the basic functioning of the cell.
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  • What is a cell membrane?

    Q: What is a cell membrane?

    A: A cell membrane is a thin layer that acts as a barrier that separates an individual cell or a cellular compartment from other surrounding structures. This dynamic layer plays an essential part in the transport of ions and nutrients.
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  • What is the function of cytoplasm?

    Q: What is the function of cytoplasm?

    A: Cytoplasm has many functions in both prokaryotic and eukaryotic cells, including aiding in the movement of cellular materials and transporting the genetic material and products of cellular respiration. It also acts as a liquid medium to suspend organelles and helps cells expand during reproduction.
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  • What are the similarities between plant and animal cells?

    Q: What are the similarities between plant and animal cells?

    A: Plant and animal cells have many of the same organelles, they both divide to reproduce, and they share similar basic structure. Scientists cite these similarities as evidence that all life evolved from a common ancestor.
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  • What are the differences between plant and animal cells?

    Q: What are the differences between plant and animal cells?

    A: There are many differences between plant and animal cells, but one of the most obvious differences is that plant cells have a cell wall. Animal cells do not have a cell wall.
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  • How does skin regenerate?

    Q: How does skin regenerate?

    A: Skin regenerates by filling the gap between the sides of the cut with newly generated skin cells, starting with the dermis (bottom-most layer of the skin) and working its way up. Very shallow cuts are followed by easy regeneration, as only the stratum basale layer (the deepest layer of skin) of the epidermis (the outermost layer of the skin) is needed to generate enough cells to repair the damage.
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  • Which organelle performs cellular respiration?

    Q: Which organelle performs cellular respiration?

    A: According to About.com, cellular respiration takes place in the mitochondria. While mitochondria primarily exist to serve as “power plants” for the cell, converting natural resources into usable energy, they also play a role in cellular division, cell growth and cell death.
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  • Why do cells need oxygen?

    Q: Why do cells need oxygen?

    A: Cells need oxygen for the efficient use of glucose in cellular respiration, the main method most organisms use to gain energy. The oxygen bonds to portions of the glucose molecule, releasing water, carbon dioxide and a large amount of energy. The cells then use that energy to generate adenosine triphosphate, commonly abbreviated as ATP, the main energy currency used by the cell.
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  • What is a physiological adaptation?

    Q: What is a physiological adaptation?

    A: A physiological adaptation is when an individual has a systemic response to an external stimulus, with the intent to remain in its homeostasis. Physiological adaptations differ from evolutionary adaptations because they don't involve transgenerational adjustment; instead, these are instead narrow in scope, having to do with an individual's change. A simple example of a physiological adaptation is when someone gets a tan from being out in the sun for a long time.
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