Cells

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 occurs in the nucleus?

    Q: What occurs in the nucleus?

    A: Transcription of DNA occurs in the nucleus, according to Cara Lea Council-Garcia, a professor at the University of New Mexico. The DNA is transcribed into messenger RNA in the nucleus of a cell.
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  • What is the function of the cheek cell?

    Q: What is the function of the cheek cell?

    A: A cheek cell, an epithelial cell found in the tissue on the inside lining of the mouth, continually secretes mucus to maintains a moist environment in the mouth. Together with salivary glands that secrete saliva, the cheek cells supply enough moisture in the mouth for enzymes to thrive. This moisture softens food, assists in swallowing and starts digestion.
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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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  • 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 some of the main functions of skin cells?

    Q: What are some of the main functions of skin cells?

    A: Some of the main functions of skin cells are to provide protection, perceive and transmit sensation, control evaporation and regulate temperature. Skin cells, which are epithelial cells, are also self-repairing and reproduce quickly. Epithelial cells are the most commonly found of the four tissue types.
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  • Why do cells divide?

    Q: Why do cells divide?

    A: Cells divide as a way of reproducing or growing or to create sex cells. Cells can only reach a certain size due to a lack of balanced growth between their parts, so they have to divide once they reach a certain point. Sex cells, such as eggs and sperm, are only created through specialized cell division.
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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 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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  • What organelle is the site of protein synthesis?

    Q: What organelle is the site of protein synthesis?

    A: There are four organelles found in eukaryotic cells that aid in the synthesis of proteins. These organelles include the nucleus, the ribosomes, the rough endoplasmic reticulum and the Golgi apparatus. All of these organelles help produce and process proteins, but only the ribosomes actually piece together amino acids into proteins.
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  • What organelle produces ATP?

    Q: What organelle produces ATP?

    A: The mitochondria inside a cell produces ATP, or adenosine triphosphate. Cellular respiration is responsible for ATP production, a process in which ATP production occurs after biochemical energy from nutrients is converted.
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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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  • If a human skill cell has 46 chromosomes, how many chromosomes will each new skin cell have after mitosis?

    Q: If a human skill cell has 46 chromosomes, how many chromosomes will each new skin cell have after mitosis?

    A: Human skin cells reproduce continuously, and each daughter cell carries a complete set of 46 chromosomes. Nucleated somatic cells, which make up the body and carry a complement of DNA, all have the same number of chromosomes as their parent cells.
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  • What is the purpose of cell division?

    Q: What is the purpose of cell division?

    A: Cell division has three purposes for an organism: reproduction, growth and maintenance. For single-celled organisms, this is their direct and only method of reproduction, and it serves no other purpose. For multicellular organisms, cell division is a step in reproduction and is necessary for growth and maintenance.
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  • What is biofilm?

    Q: What is biofilm?

    A: Biofilm is a group of microorganisms that are joined together on a surface. They adhere to each other with molecular strands called extracellular polymeric substances, or EPS.
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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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  • What is the function of a cell membrane?

    Q: What is the function of a cell membrane?

    A: A cell membrane protects the structures within the cell. Cell membranes are semipermeable, meaning that only certain objects are able to pass through them. Cell membranes also give shape to the cell and support its structure.
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  • How do cells use energy?

    Q: How do cells use energy?

    A: Cells use energy in order to grow, regulate metabolism and reproduce. This energy is obtained from a source such as food molecules or light from the sun, and through processes like glycolysis, the citric acid cycle and oxidative phosphorylation, an energy-rich molecule is then created. The cell can then use the energy in the protein molecule to help it function.
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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 does a cell make a copy of its DNA before mitosis occurs?

    Q: Why does a cell make a copy of its DNA before mitosis occurs?

    A: A cell makes a copy of its DNA before mitosis occurs so there is a set of DNA for the daughter cell after mitosis has occurred. Because each cell needs its own set of DNA, there must be two sets of DNA present in a cell before it divides into two.
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  • What is the significance of mitosis?

    Q: What is the significance of mitosis?

    A: Mitosis' significance is cell division, which enables an organism to grow and reproduce. During mitosis, a single cell divides and produces two identical daughter cells. Each cell contains the same genetic material and chromosome number as the original cell.
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  • What is a summary of mitosis?

    Q: What is a summary of mitosis?

    A: During mitosis, a cell enlarges, splits and multiplies DNA, and then separates into two daughter cells. During this reproductive cycle, the cell goes through five different phases.
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