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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  • 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 makes plant and animal cells different?

    Q: What makes plant and animal cells different?

    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 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 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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  • 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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  • 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 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 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 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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  • 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 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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  • 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 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 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 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 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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  • 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 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 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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  • 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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