Cells

A:

There are several key differences between plant and animal cells, such as cell wall structure, presence or absence of plastids, lysosomes and centrioles and shape of vacuoles. These characteristics are the primary and most distinct differences between plant and animal cells. However, they only exist in organisms classified as eukaryotic, and occur primarily in central organelles.

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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 are the differences between plant cells and animal cells?

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

    A: The main difference between plant cells and animals cells is that plant cells possess a cell wall and animal cells do not. Animal cells have an irregular shape, and plant cells have a fixed, rectangular shape.
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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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  • 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 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 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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  • 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 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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  • 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 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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  • 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 is a good analogy for the functioning of the nucleolus?

    Q: What is a good analogy for the functioning of the nucleolus?

    A: The best analogy for the nucleolus in eukaryotic cells is a factory that makes tools that are used to build other resources. The primary function of the nucleolus is to combine and construct ribosomes. The primary function of ribosomes is to build proteins necessary for the cell.
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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 the function of the dermis layer of cells?

    Q: What is the function of the dermis layer of cells?

    A: The dermis layer of skin is beneath the epidermis, and its main function is temperature regulation and blood supply. The dermis also gives skin its thickness, and it makes up roughly 90 percent of the thickness of skin.
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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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  • 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 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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  • 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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  • What does DNA stand for?

    Q: What does DNA stand for?

    A: DNA stands for deoxyribonucleic acid, which is the molecule that carries genetic information in humans and all other living organisms. Deoxyribonucleic acid is composed of four chemical bases: adenine, guanine, cytosine and thymine. The sequence of these bases within DNA encodes genetic information.
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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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