Cells

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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  • What Is the Function of the Mitochondrion?

    Q: What Is the Function of the Mitochondrion?

    A: A mitochondrion produces energy for a cell. Mitochondria (the plural of mitochondrion) are small organelles found in most nucleated cells, including those of plants, animals and fungi.
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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 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 Function of the Cell Body?

    Q: What Is the Function of the Cell Body?

    A: The main function of the cell body of a neuron is to integrate synaptic information and transmit this information to other cells via the axon. The cell body also completes a variety of biochemical processes to keep the neuron functioning properly.
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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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  • What Is the Function of Cytoplasm?

    Q: What Is the Function of Cytoplasm?

    A: Cytoplasm helps eukaryotic and prokaryotic cells by aiding in the transport of cell materials, moving genetic material and assisting with cellular respiration. It also gives cells their shape and supports biochemical reactions.
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  • What Are Examples of Single-Celled Organisms?

    Q: What Are Examples of Single-Celled Organisms?

    A: Examples of single-celled organisms include species in the Kingdom Protista, the Kingdom Monera and a few representatives of the Kingdom Fungi. Monera includes both conventional bacteria, called eubacteria, and a very strange group of organisms known as archeobacteria.
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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 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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  • What Is the Control Center of a Cell?

    Q: What Is the Control Center of a Cell?

    A: The nucleus is the control center of a cell. The nucleus controls the cell's growth and reproduction and contains the cell's DNA.
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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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  • What Is the Function of Collar Cells in Sponges?

    Q: What Is the Function of Collar Cells in Sponges?

    A: Collar cells beat their flagella back and forth to force water through the sponge. Collar cells also pick up tiny bits of food brought in with water.
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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 Are the Similarities Between Plant and Animal Cells?

    Q: What Are the Similarities Between Plant and Animal Cells?

    A: Plant and animals cells have many of the same organelles, such as the nucleus, mitochondrion, Golgi apparatus, ribosomes and endoplasmic reticulum. In addition, the contents of these cells are held together by cell membranes.
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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 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. Animal cells have an irregular shape, and plant cells have a fixed, rectangular shape.
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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 Type of Cells Undergo Meiosis?

    Q: What Type of Cells Undergo Meiosis?

    A: Germ cells, which are diploid, undergo meiosis to produce haploid gametes. A gamete is a cell that fuses with another to form a zygote, which develops into an embryo. Female gametes are called eggs, while male gametes are known as sperm.
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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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  • What Are the Three Main Reasons Why Cell Division Is Important?

    Q: What Are the Three Main Reasons Why Cell Division Is Important?

    A: The three main reasons why cell division is important in organisms are reproduction, repair and growth, according to "McDougal Littell Science Cells and Heredity." Cell division is necessary in order for life to continue.
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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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