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 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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  • 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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  • 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 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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  • Where does translation occur?

    Q: Where does translation occur?

    A: Translation occurs in the cell, specifically in the cytoplasm. Translation is one of many steps in the creation of protein which is needed to fuel the body.
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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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  • 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 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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  • 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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  • 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 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 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 organelle is the site of protein synthesis?

    Q: What organelle is the site of protein synthesis?

    A: There are four organelles found in eukaryotic cells that aid in the synthesis of proteins. These organelles include the nucleus, the ribosomes, the rough endoplasmic reticulum and the Golgi apparatus. All of these organelles help produce and process proteins, but only the ribosomes actually piece together amino acids into proteins.
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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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  • Why does a sperm cell have a tail?

    Q: Why does a sperm cell have a tail?

    A: Sperm cells have tails primarily for the purpose of swimming. They must move from the vagina up through the female reproductive system.
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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 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 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 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 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 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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