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Chapter 7-1 Life is Cellular. Early Microscopes. Robert Hooke -1665 looked at a thin slice of cork , from the cork oak tree Coined the term “cells”; looked like the rooms of a monastery (many empty boxes). Anton van Leeuwenhoek. looked at pond water - PowerPoint PPT Presentation
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7-1 Life Is Cellular
Chapter 7-1 Life is Cellular
Early MicroscopesRobert Hooke -1665looked at a thin slice of cork, from the cork oak treeCoined the term cells; looked like the rooms of a monastery (many empty boxes)
Anton van Leeuwenhoeklooked at pond waterhe was amazed by tiny living organisms
Developing the Cell TheoryMatthias Schleiden- 1838 Concluded that plants were made of cells
Theodor SchwannConcluded that animals were made of cells - 1839
Rudolf Virchow - 1858Concluded that cells must come from dividing cells
Cell Theory:1) All living things are composed of cells
2) Cells are the basic units of structure and function in living things
3) New cells are produced from existing cells. Name of Instrument: Compound Light Microscopes Magnify 1500x(what well use!)
Use a series of lenses to magnify objects in steps.
Today researchers tag molecules with fluorescence and follow their path through the cell.
Exploring the cell Microscopes (what we skipped in Chapter 1)
ProkaryotesEukaryotesFind us!!Electron Microscopes 150,000x magnification
Transmission Electron Microscopes (TEM) explore cell structures and large proteins
Scanning Electron Microscopes (SEM) scan of surface of specimen; 3D images
Prokaryotes vs. EukaryotesAll cells:Have a plasma membraneContain DNA
Two broad categories:Eukaryotes - contain nucleus; eu means true
Prokaryotes- no nucleus; pro means before
Eukaryotes
HAVE NUCLEUSLarger, more complexPlants, animals, fungi, and protists
Prokaryotes
NO NUCLEUSSmaller, simplerBacteria
ProkaryotesCommon to BothEukaryotespro=__________
generally smallerless complicatedno
Ex: Bacteriacontain __________
Eu= ___________
Generally largerContain membrane bound organelles (little organs)
Ex: beforetrueMembrane bound organellesPlants, animals, fungi, and protistsDNACell membraneClick:Eukaryotic Cell vs. Prokaryotic cell
NucleusNo nucleusMembrane bound organellesEndosymbiotic Theory