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Today in Science: Science December 13, 2010 Chapter 4 Section 2 “Bacteria” You will need: Science book Spiral notebook Pencil Order of events: 1. Open books to pg 126 (Intro.) 2. 4.2 Notes 3. Draw/Label 4. Bacteria Song The Bacterial Cell: Facts Discovered in the late 1600s (Anton Van Leeuwenhoek) Single-celled organism Prokaryotes (genetic material in their cells is NOT in a nucleus) Accomplish all tasks necessary for life Use energy Grow and develop Respond to its surroundings Reproduce More Cool Bacteria Facts 600 types of bacteria live on the skin Saliva contains about 6 different kinds of bacteria One cell can double within 20 to 30 minutes Cell Shapes 1. Spherical 2. Rodlike 3. Spiral Shaped Cell Structures Cell Wall Cell membrane Cytoplasm Ribosomes Genetic material (located in the cytoplasm) Flagellum (whiplike structure; propeller) Note: Not all Bacteria have a flagellum TIME TO DRAW Turn to page 128 in your science book Copy figure 7 into your science notes Label the figure after you draw it. Two Kingdoms of Bacteria 1. Archaebacteria “Ancient Bacteria” Live in EXTREME environments Hot springs, lemon juice, salty waters, intestines of animals, mud, sewage Produce foul odors 1. Eubacteria Live everywhere (on you!) Help maintain Earth’s physical conditions Produce food and oxygen O Bacteria ! (to the tune of “Oh Susanna”) You reproduce by fission You do not have a nucleus You do have a cell wall You live in water, air and soil or anywhere at all http://www.teachertube.com/view_video .php?viewkey=1d2b0339687bdd7fcfb0&p age=1&viewtype=&category= and you do so very fast And under harsh conditions in an endospore you last Oh, Bacteria so simple and so small without you ecosystems would not function well at all Reproduction Bacteria need: Plenty of food The right temperature Suitable conditions Note: Reproduction conditions are rarely ideal Key terms: Use your book to find the following terms Write the word and definition in your notes. Binary Fission Asexual Reproduction Sexual Reproduction Conjugation Key terms: Binary Fission: process in which one cell divides to form two identical cells. Asexual Reproduction: a reproductive process that involves only one parent and produces offspring that are identical to the parent. Binary Fission Reproduction Key terms: Sexual Reproduction: involves two parents who combine their genetic material to produce a new organism. (New cell differs from both parents) Conjugation: The process in which a unicellular organism transfers some of its genetic material to another unicellular organism. Reproduction Name of Process Number of Parents What Occurs in Process Result of Process Asexual Reproduction Binary Fission Sexual Reproduction Conjugation One Two •Cell duplicates its genetic material •Cell divides into 2 separate cells •One bacterium transfers some of its genetic material into another •New cells identical to parents •Bacteria that are genetically different from parents http://www.teachertube.com/view _video.php?viewkey=1d2b0339687 bdd7fcfb0&page=1&viewtype=&cat egory= http://www.africangreyparrot t.com/sciencekaraoke1.html