Cells

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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  • 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 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 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 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 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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  • How does the structure of a muscle cell type relate to its function?

    Q: How does the structure of a muscle cell type relate to its function?

    A: According to About.com Biology section, there are three different types of muscle cells, and each has a different structure related to its function. Cardiac muscles are designed to contract together; skeletal-muscle cells have ordered striations so that they can contract farther than other muscle cells to move the body; and, visceral-muscle cells are designed to contract slower and remain contracted for long periods of time.
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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 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 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 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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  • 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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  • 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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  • Why are cells called the basic unit of life?

    Q: Why are cells called the basic unit of life?

    A: Cell are considered the basic unit of life because all life forms are composed of them. Some forms of life are made of one cell; others contain trillions.
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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 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 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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  • How does skin regenerate?

    Q: How does skin regenerate?

    A: Skin regenerates by filling the gap between the sides of the cut with newly generated skin cells, starting with the dermis (bottom-most layer of the skin) and working its way up. Very shallow cuts are followed by easy regeneration, as only the stratum basale layer (the deepest layer of skin) of the epidermis (the outermost layer of the skin) is needed to generate enough cells to repair the damage.
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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 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 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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