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Science Presentation


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Science Presentation

  1. 1. a i. V 4% 2‘ ‘( H V ; I I ‘J - &wWAAd , , , ,,, '”l L’. K ’H g [1 h1W» J '. ' 1" 1 ‘NH! ‘H {I4- JLL)‘-L0‘! /9
  2. 2. 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. chromatin . . . *3? ~ I . The nucleus is a specialized, usually Mud“, “ . _-. . spherical mass of protoplasm encased envelope is ~. ._ in a double membrane, and found in pore in m. (i. _.a, /.( _ ~ ~ __ most living eukaryotic cells, directing °"'V‘~"°Pe ‘ “ 2;». their growth, metabolism, and reproduction, and functioning in the transmission of genic characters. The nucleus is only present in eukaryotic cells Outer membrane‘? /g Inner membrane ‘*4 Nucli. -uplasm Nucleolus I-" la"
  3. 3. Cell Membrane 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.
  4. 4. _L V . _ , ml Definition — A rigid boundary prokaryotic cells and cellulose in plant cells. I ; u lr---lt_l Structure I _ "I I - a non-living secretion of the cell lean on - ill _" membrane, composed of "' T s L cellulose L C'r'e"§""""' . t ‘ — - cellulose fibrils deposited in alternating ~—, :;: ,’u , _f: ,__—" . ’ . _. layers for strength ' ' __ - contains pits (openings) that make it Mimlmndm totally permeable in . L Function - - provides protection from physical injury *‘nal. il.4-. ,.. ..V. ;': -Til ' - together with vacuole, provides skeletal "5-‘9(t'Lu'~&‘. ._, .-2-ft so- av”
  5. 5. Nucleolus 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.
  6. 6. 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.
  7. 7. NUCLEUS C YTO PLASM CELL / MEMBRANE 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.
  8. 8. Endoplasmic reticulum (ER) is a membranous labyrinth so extensive that it accounts for more than half the total membrane in many eukaryotic cells. The word endoplasmic means "within" the cytoplasm, and the word reticulum is derived from a word meaning "network. " The ER consists of a network of membranous tubules and sacs called cisternae. The ER membrane separates its internal compartment, the cisternal space, from the cystosol. Because the ER membrane is continuous with the nuclear envelope, the space between the two membranes of the envelope is