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Evolution of Microscopes Go to Section: Slide # 2 A. Microscope Timeline 1590: Hans & Zacharias Janssen: invented compound light microscope Go to Section: Slide # 3 1667: Robert Hooke: studied cork and saw tiny, regular shaped “boxes”. He named them cells. Go to Section: Slide # 4 Father of Microbiology 1674: Anton van Leeuwenhoek: used the simple compound microscope to view pond water. He observed small organisms swimming around. He was the first to observe bacteria Go to Section: Slide # 5 1831: Robert Brown •Discovered nucleus in orchid cells Go to Section: Slide # 6 1838: Matthais Schleiden: Co-founder of the Cell Theory – All plants are made of cells Go to Section: Slide # 7 1839: Theodor Schwann: Co-Founder of the Cell Theory •All animals are made of cells •Cell is the basic unit of function Go to Section: Slide # 8 1855: Rudolf Virchow: •New cells are formed only from preexisting cells Bacterial cell producing a new bacterial cell. Go to Section: Slide # 9 The Cell Theory Three statements of the cell theory: 1. All living things are made up of 1 or more cells. 2. The cell is the basic unit of function. 3. New cells come from preexisting cells. Go to Section: Prokaryotic Cells : simple, single celled organisms that lack a true nucleus. – Can exist in a large range of environments. • They can live in hot, harsh temperatures • They can live without oxygen • Some can even make their own food • Bacteria are the only prokaryotic cells 10 Eukaryotic Cells – cells that contain a TRUE nucleus with DNA inside. – Considered to be complex because it has organelles 11 What is an organelle? An organelle is a structure that carries out specific activities in the cell. Organelle means “little organ” 12 IDENTIFY THE FOLLOWING CELLS AS PROKARYOTIC OR EUKARYOTIC. EXPLAIN WHY YOU CHOSE THAT ANSWER. B A 1. Identify the cellular parts and give their function. 2. What type of cell is this, prokaryotic or eukaryotic? F C E D Word Bank: Chloroplast, Vacuole, Mitochondria, Nucleus, Cell membrane, Cell Wall Contains genetic material (DNA or RNA), nucleus present, living, Eubacteria, Archaebacteria, Animalia, Protist, Fungi, Plantae, membrane bound organelles, has a cell membrane, has a cell wall, ribosomes PROKARYOTES Both EUKARYOTES