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 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 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 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 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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  • 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 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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  • What is diffusion in science?

    Q: What is diffusion in science?

    A: Diffusion is the action of molecules moving from an area of high concentration to an area of lower concentration. It is caused by kinetic energy.
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  • What is the definition of a plant cell?

    Q: What is the definition of a plant cell?

    A: A plant cell is the structural and functional unit of a plant. Plant cells generally form several different colonies in order to become a higher functioning organism.
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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 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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  • 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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  • 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 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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  • 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 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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  • 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 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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  • 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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  • Why is the nucleus called the control center of the cell?

    Q: Why is the nucleus called the control center of the cell?

    A: The nucleus can be thought of as the control center of a eukaryotic cell because it contains most of the genetic material that carries the instructions for the cell's operations. Inside the nucleus, DNA directs the sequence of chemical steps needed for the synthesis of proteins and, by way of the proteins' action, it controls the metabolism of the rest of the cell.
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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 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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