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Name____________________________________Date_____Period___ HBiology Intro to Cells WS 7.1 Life is Cellular Read pages 189-194 and answer the following questions. If someone is NOT in your book, LOOK them up 1. Briefly describe how each of the following men contributes to the field of cytology. Anton van Leeuwenhoek Robert Hooke Robert Brown Matthias Schleiden Theodore Schwann Rudolf Virchow Lorenz Oken 2. Define the term cell. 3. What does the cell theory state? a. b. c. Prokaryotic and Eukaryotic Cells All cells have FOUR basic features in common: They are all bounded by a membrane, called a plasma (cell) membrane. Within the membrane is a semi-fluid substance, cytoplasm, in which organelles are found. All cells contain chromosomes, carrying genes in the form of DNA. In addition, all cells have ribosomes, tiny organelles that make proteins according to instructions from the genes. 2 Types of Cells ____________________ (Pro= before, karyon = kernel) Found in 2 domains: Archaea and Bacteria single celled No true nucleus; lacks nuclear envelope/membrane Genetic material found in nucleoid region Called Prokaryotes ____________________ (Eu=true, karyon = kernel) Found in Domain Eukarya (all other Kingdoms): Animal, Plant, Fungi, Protist True nucleus; bounded by nuclear envelope/membrane Genetic material found within nucleus Called Eukayotes Evolved first – 3.5 billion years ago and are very small 1-10um Evolved 1.45 billion years ago and are larger 10100um Lack membrane bound organelles – do contain ribosomes Contains cytoplasm with cystol and membranebound organelles Typical Prokaytoic Cell Typical Animal Cell Typical Plant Cell 7.1 Life Is Cellular For Questions 1–6, complete each statement by writing the correct word or words. 1. The invention of the ___________ made the discovery of cells possible. 2. Robert Hooke used the name to refer to the tiny empty chambers he saw when he observed magnified cork. 3. German botanist Matthias Schleiden concluded that ___________ are made of cells. 4. German biologist Theodor Schwann concluded that _____________ 5. Rudolph Virchow concluded that new cells are produced from 6. The are made of cells. ___________. combines the conclusions made by Schleiden, Schwann, and Virchow. For Questions 7–9, write True if the statement is true. If the statement is false, change the underlined word or words to make the statement true. 7. The size of the image formed by a light microscope is unlimited because light that passes through matter is diffracted. 8. Fluorescent dyes help scientists see the movement of compounds and structures in living cells. 9. Transmission electron microscopes form a 3-D image of the surface of a specimen. Prokaryotes and Eukaryotes 10. Complete the table about the two categories of cells. Two Categories of Cells Category Definition Size range Examples Prokaryotic cells Eukaryotic cells 11. Which category of cells—prokaryotic or eukaryotic—is your body composed of? ________ Answer the Assessment Questions (including math practice problems) on page 194 in text.