332021 Title Biology 10506 Objectives To learn about

3/3/2021 Title: Biology 10/5/06 Objectives: To learn about microscopes and scientists that discovered cells and cell parts. Class Topics • Hand in W. S. “Microscopy and Measurement” before the bell rings • Complete lab • Review Microscopes • Notes – Scientists Obstacles cannot crush me; every obstacle yields to stern resolve. Leonardo da Vinci Wednesday, March 3, 2021 12: 45 PM 1

3/3/2021 Class Assignments What • • • By When Lab “Using a Compound Light Microscope” W. S. “Microscopy & Measurement” 1 A Section Review 1 -5 p. 61 Microscope quiz 10/11/06 W. S. “Structure and Function of Cells” Chapter 3 Quiz 1 10/13/06 (1 -4 in complete sentences) 10/5/05 10/11/06 • Due this class period • Due next class period • Due in the future 2

3/3/2021 1 A & 4 B Grade Sheet 3

3/3/2021 2 A Grade Sheet 4

3/3/2021 3 A Grade Sheet 5

3/3/2021 4 A Grade Sheet 6

3/3/2021 Complete lab • Turn the lab in when you have completed it • Work on homework 7

3/3/2021 Microscope Review Sheet 8

3/3/2021 Microscope Quiz • Parts • • – 10 – picture on next slide Transport High power – objective Diaphragm – purpose Cleaning Storage Revolving nosepiece Matching – Characteristics of types of microscopes 9

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3/3/2021 Scientists • Robert Hooke (English, 1665) – Looked at cork and named cells - after rooms in a monastery – thought only plants had cells • Anton van Leeuwenhoek (Dutch, 1674) – First to use microscope to observe living cells • Father of microbiology – looked at pond water - animacules (little animals) – . . . I could exceedingly plainly perceive it to be all perforated and porous, much like a Honeycomb. . . these pores or cells , were not very deep, but consisted of a great many little boxes. . . – Hooke describing his observations on a thin slice of cork. 11

3/3/2021 Cell Theory • Matthias Schleiden (1838) – All plants are made of cells • Theodore Schwann (1839) – All animals are made of cells • Rudolf Virchow (1858) – All cells come from preexisting cells 12

3/3/2021 Cell Theory • All living things are composed of one or more cells. • Cells are the basic units of structure and function in living things. • All cells come from preexisting cells. 13

3/3/2021 Cell Size Math lab – p. 56 • Most organisms have many small cells rather than fewer large ones – Why? • Surface area-to-volume ratio – 6: 1 good – 3: 1 very large for cells • Any lower than this is very dangerous • Allows transfer of materials in and out of cell easily • Cell size = small, SA: Vol = high • Cell size = large, SA: Vol = low 14

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3/3/2021 All cells have… • • • Cell membrane – around outside Cytoplasm – fluid of cell Cytoskeleton – structure of cell Ribosomes – make protein DNA – used to make protein • Some lose these after time due to specialization 16