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Science Presentation






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    Science Presentation Science Presentation Presentation Transcript

    • Definition – positively charged center of an atom composed of neutrons and positively charged protons and surrounded by negatively charged electrons and eukaryotic cells. The central membrane – bound organelle that manages cellular functions and contains DNA. The nucleus is a specialized, usually spherical mass of protoplasm encased in a double membrane, and found in most living eukaryotic cells, directing their growth, metabolism, and reproduction, and functioning in the transmission of genic characters. The nucleus is only present in eukaryotic cells
    • Definition - Thin, flexible envelope that surrounds the cell. It allows the cell to change shape and controls what goes into and out of the cell. It contains carbohydrates, glycolipids, glycoprotein, cholesterol, integral protein, peripheral protein, filaments of cytoskeleton, cytoplasm, extra cellular fluid.
    • Definition – A rigid boundary in prokaryotic cells and cellulose in plant cells. Structure - a non-living secretion of the cell membrane, composed of cellulose - cellulose fibrils deposited in alternating layers for strength - contains pits (openings) that make it totally permeable Function - provides protection from physical injury - together with vacuole, provides skeletal
    • Definition - A small, typically round granular body composed of protein and RNA in the nucleus of a cell. It is usually associated with a specific chromosomal site and involved in ribosomal RNA synthesis and the formation of ribosomes.
    • Ribosomes are found in the cytoplasm and on the endoplasmic reticulum. Their job is to make proteins needed in the cell for everyday life. The nucleus tells the ribosomes which proteins to make, so that the cell can work efficiently. The nucleus also makes the ribosomes and sends them out for work.
    • The cytoplasm is a jelly like material that is made up of mostly water. It is what fills the cell is most of the time clear in color. It is more like a gel then a watery substance, but it liquefies when it is shaken or stirred. The cytoplasm contains the organelles and lets it circulates and function well. What separates the cytoplasm from the watery environment that the cell is in is the plasma membrane.
    • cisternae. The ER membrane Endoplasmic separates its reticulum (ER) is internal a membranous compartment, the labyrinth so cisternal space, extensive that it from the cystosol. accounts for Because the ER more than half membrane is the total continuous with membrane in the nuclear many eukaryotic envelope, the cells. The word space between endoplasmic. means quot;withinquot; the cytoplasm, and the word the two reticulum is derived from a word meaning membranes of quot;network.quot; The ER consists of a network of the envelope is membranous tubules and sacs called